With DPF/CDPF The exhaust pollution of diesel engines thing that collocation uses controls catalyst and application and preparationTechnical field
The invention belongs to environmental technology field, control catalyst and application and preparation particularly to a kind of exhaust pollution of diesel engines thing used with DPF/CDPF collocation.
Background technology
Fuel chemical energy is changed into mechanical energy by internal combustion engine.Fuel (Hydrocarbon) mixes with air, high-temp combustion occurs in cylinder, generates carbon dioxide and water.Owing to combustion process is incomplete, many accessory substances are had to generate.Imperfect combustion product includes carbon monoxide, Hydrocarbon and carbon black.It addition, a small amount of nitrogen is at high temperature oxidized to nitric oxide and nitrogen dioxide, it is generally called nitrogen oxide NOx.The sulfur contained in fuel is oxidized to sulfur dioxide and a small amount of sulfur trioxide.These by-products are all air pollutants.In Otto (Otto) engine operation process, fuel oil is pre-mixed with air, and its mixture is compressed in the cylinder.Its typical compression ratio is 8 ~ 14.The mixture of fuel oil and air is under high pressure by spark ignition.In otto engines operates, air-fuel ratio closely stoichiometric proportion.In the tail gas of engine emission, oxygen content is the lowest, and three-way catalyst can remove carbon monoxide, Hydrocarbon and nitrogen oxides the most simultaneously.
During diesel oil (Diesel) is engine-operated, air-fuel ratio is significantly larger than stoichiometric proportion.Air is compressed in the cylinder, and fuel oil is under high pressure injected in cylinder concurrently giving birth to automatic combustion.Compared with otto engines, diesel motor compression ratio is high, and generally 9 ~ 30, the carbon monoxide and the hydrocarbon pollution substrate concentration that generate in its combustion process are relatively low.It addition, air fuel mixing is uneven in diesel motor, the region imperfect combustion rich at fuel causes carbon black to be formed.In exhaust process, its ignition mixture thing is discharged from cylinder and gradually cools down.Wherein carbon monoxide, little molecular carbon hydrogen compound, sulfur dioxide and nitrogen oxides exist with gaseous state, and macromolecular hydrocarbon (fuel of residual and lubricating oil) is condensed into liquid.Sulfur trioxide and water reaction solution body sulphuric acid.Liquid hydrocarbon and sulphuric acid absorption form black dust granules material at carbon surface.
Containing substantial amounts of oxygen in diesel motor burning ejection, its pollutant emission controls still to there is many challenges.Under conditions of a large amount of oxygen exist, carbon monoxide and little molecular carbon hydrogen compound effectively can be removed by catalysed oxidn.The removal of nitrogen oxides lacks high activity and selective effective technology.Then there is different challenges in the removal of black dust granules.Remove black dust granules PM for high efficiency, the DPF/CDPF technology of filtration is usually taken.DPF is diesel particulate filter DieselThe abbreviation of Particulate Filter, refers to be arranged in diesel engine exhaust system, reduces the device of particulate matter PM in aerofluxus by filtration；CDPF is catalytic type diesel particulate filter Catalyzed DieselThe abbreviation of Particulate Filter, refer to be arranged in diesel engine automobile air exhausting system, it is coated with noble metal catalyst at DPF carrier inner surface, is reduced the activation energy of black smoke granule PM regeneration by catalytic action, thus allow the device of the black smoke granule automatic regeneration being filtered.
Therefore, environmental technology field is badly in need of a kind of exhaust pollution of diesel engines thing used with DPF/CDPF collocation and is controlled catalyst and application and preparation, can effectively reduce the oxidation catalyst of harmful pollution substrate concentration, catalyst manufacturing procedures and the catalyst technology application in diesel engine emissions control in diesel engine emissions.
Summary of the invention
The invention provides a kind of exhaust pollution of diesel engines thing used with DPF/CDPF collocation and control catalyst and application and preparation, technical scheme is as follows:
The exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst, and including following component: honeycomb shaping matrix, platinum-group noble metals, rare-earth oxide, high surface area carrier material, water and acid, and the ratio of component is any weight ratio.
Preferably, controlling, in catalyst, also to include: nonferrous metal oxides at the above-mentioned exhaust pollution of diesel engines thing used with DPF/CDPF collocation, the ratio of component is any weight ratio.
Preferably, controlling, in catalyst, also to include: molecular sieve at the above-mentioned exhaust pollution of diesel engines thing used with DPF/CDPF collocation, the ratio of component is any weight ratio.
Preferably, controlling in catalyst at the above-mentioned exhaust pollution of diesel engines thing used with DPF/CDPF collocation, honeycomb shaping matrix has open pore passage structure, and material is ceramic material or metal material.
Preferably, controlling in catalyst at the above-mentioned exhaust pollution of diesel engines thing used with DPF/CDPF collocation, honeycomb shaping matrix is cordierite, mullite, carborundum, aluminium oxide, aluminum titanate, rustless steel, Aludirome, nickel alloy；Pore passage structure is triangle, circle, square, hexagon or octagon, hole density be 50 ~ 1200 mesh per square inch.
Preferably, control in catalyst at the above-mentioned exhaust pollution of diesel engines thing that collocation uses with DPF/CDPF, platinum-group noble metals be the one in platinum, palladium and rhodium, two or more；Nonferrous metal oxides be the one in manganese oxide, ferrum oxide, copper oxide, cobalt oxide, two or more；Rare-earth oxide is one or both in cerium oxide, lanthana；Molecular sieve be the one in ZSM-5, Beta, Y, modenite, two or more；High surface area carrier material be the one in aluminium oxide, silicon oxide, titanium oxide, zirconium oxide, aluminosilicate, two or more；Acid is nitric acid.
With the preparation process of the exhaust pollution of diesel engines thing control catalyst that DPF/CDPF collocation uses, comprise the steps:
Step one, by rare-earth oxide, high surface area carrier material, water and acid by ball milling, makes mixed slurry；
Step 2, the mixed slurry coated honeycomb shaping matrix made by step one, then make mixed slurry form fixing coating at honeycomb shaping matrix surface through drying, roasting；
Step 3, repeats the step of step 2, the most coated honeycomb shaping matrix, until it reaches default targeted loads amount；
Step 4, reaches step 3 the honeycomb shaping matrix with fixing coating of targeted loads amount, is impregnated in platinum-group noble metals precursor aqueous solution so that it is reaches the targeted loads amount of platinum-group noble metals, then makes fixed catalyst through drying, roasting.
Preferably, in the above-mentioned exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls the preparation process of catalyst, step one also includes molecular sieve, with rare-earth oxide, high surface area carrier material, water and acid by ball milling, make mixed slurry；Step 3 is reached the honeycomb shaping matrix with fixing coating of targeted loads amount by described step 4, it is impregnated in platinum-group noble metals precursor aqueous solution and nonferrous metal oxides precursor aqueous solution, reach the targeted loads amount of platinum-group noble metals, nonferrous metal oxides, then make fixed catalyst through drying, roasting；
In step 5, the targeted loads amount of platinum-group noble metals is 0.01-4g/L, and the targeted loads amount of nonferrous metal oxides is 1-20g/L；In described step 3, general objective load capacity is 22-285g/L, and the targeted loads amount of rare-earth oxide is 1-30g/L, and the targeted loads amount of molecular sieve is 1-35g/L, and the targeted loads amount of high-ratio surface support materials is 20 ~ 200g/L.
Preferably, in the above-mentioned exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls the preparation process of catalyst, in step 5, the targeted loads amount of platinum-group noble metals is 0.1-3g/L；The targeted loads amount of nonferrous metal oxides is 2-15g/L；The targeted loads amount of described step 3 middle rare earth metal-oxide is 2-20g/L, and the targeted loads amount of molecular sieve is 2-20g/L, and the targeted loads amount of high-ratio surface support materials is 30 ~ 150g/L.
The exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst application in diesel engine, comprises the steps:
Step A, is loaded on exhaust pollution of diesel engines thing control catalyst sealing in the stainless steel casing of diesel engine；
Step B, is connected to the exhaust pollution of diesel engines thing encapsulated in step A control catalyst in diesel engine discharge-channel；
Step C, starts diesel engine so that it is operating condition, and engine exhaust flows through exhaust pollution of diesel engines thing and controls catalyst, and carbon monoxide and Hydrocarbon, at catalyst surface, are oxidized to carbon dioxide and steam；Nitric oxide is oxidized to nitrogen dioxide at catalyst surface, nitrogen dioxide has extremely strong oxidisability, the black smoke granule that can filter down Diesel engine black smoke particulate filter carries out autoxidation and removes, and is oxidized to carbon dioxide and discharges, thus realizes black smoke granule ground automatic regeneration；Black smoke granule is formed on carbon granule surface by liquid hydrocarbon and sulphuric acid absorption, and therefore, liquid hydrocarbon, as strong oxidizer, is oxidized to carbon dioxide, steam and nitric oxide by nitrogen dioxide gas.
Beneficial effects of the present invention:
1, the present invention uses honeycomb shaping matrix, platinum-group noble metals, rare-earth oxide, high surface area carrier material, water, acid to be made into exhaust pollution of diesel engines thing and control catalyst, remove the pollutant in tail gas, can effectively reduce harmful pollution substrate concentration in diesel engine emissions, novel formula, ratio is any, operation is more prone to, and compensate for the blank in industry.
2, exhaust pollution of diesel engines thing controls preparation process employing ball milling, drying, the method for roasting of catalyst, and technique is simple, step science, processing ease.
3, the present invention in use, exhaust pollution of diesel engines thing control catalyst be first encapsulated in metal shell, be connected in diesel motor exhaust emissions passage.Diesel motor tail gas flows through honeycomb shaping catalyst, carbon monoxide and Hydrocarbon at catalyst surface, is oxidized to carbon dioxide and steam；Nitric oxide, at catalyst surface, is oxidized to nitrogen dioxide；By the concentration of pollutant in emission before and after comparing catalyst and installing, the efficiency of catalyst can be calculated.Under normal circumstances, add exhaust pollution of diesel engines thing and control diesel oil function reduction by 50 ~ 95% carbon monoxides, 40 ~ 90% Hydrocarbon of catalyst；The ratio that pollutant conversion of nitric oxide gas becomes nitrogen dioxide is 10 ~ 70%, and nitrogen dioxide falls as strong oxidizer, the black dust granules PM that DPF/CDPF can be filtered down, the most automatically regeneration, and also referred to as second-time burning is fallen；Greatly reduce the discharge of pollutant, improve environmental conservation ability, more meet environmental protection concept.
Accompanying drawing explanation
The present invention is described below in conjunction with the accompanying drawings in detail with detailed description of the invention:
Fig. 1 is the flow chart that the exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst preparation process.
Fig. 2 is 3 kinds of catalyst using respectively in embodiment 2, embodiment 3, reference examples to carbon monoxide and propylene oxidation activity with the change curve of reaction temperature.
Fig. 3 is the activity change curve with reaction temperature that 3 kinds of catalyst for nitrogen monoxide that embodiment 2, embodiment 3, reference examples use respectively are oxidized to nitrogen dioxide.
Detailed description of the invention
For the measure making the technology of the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only that the present invention is a part of rather than whole.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment 1:
The exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst, and including following component: honeycomb shaping matrix, platinum-group noble metals, rare-earth oxide, high surface area carrier material, water and acid, and the ratio of component is any weight ratio.
Embodiment 2:
The exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst, including following component: honeycomb shaping matrix, platinum-group noble metals, nonferrous metal oxides, rare-earth oxide, high surface area carrier material, water and acid, and the ratio of component is any weight ratio.
Nonferrous metal oxides reduces carbon monoxide and is converted into carbon dioxide, and conversion of nitric oxide gas becomes the initiation temperature of nitrogen dioxide；Improve carbon monoxide and be converted into carbon dioxide, and conversion of nitric oxide gas becomes the ability of nitrogen dioxide.
Embodiment 3:
The exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst, including following component: honeycomb shaping matrix, platinum-group noble metals, nonferrous metal oxides, rare-earth oxide, molecular sieve, high surface area carrier material, water and acid, and the ratio of component is any weight ratio.
Molecular sieve has good cryogenic absorption effect；At low temperatures, now catalyst is not reaching to initiation temperature, and Hydrocarbon can not be oxidized, but by molecular sieve, Hydrocarbon physical absorption at low temperatures can be fallen；When delivery temperature raises when, catalyst has reached initiation temperature, and molecular sieve discharges Hydrocarbon again, by catalyst, then Hydrocarbon chemical reaction is fallen, thus improves the low temperature removal effect of Hydrocarbon.
In the present embodiment, honeycomb shaping matrix has open pore passage structure, and material is ceramic material or metal material.
In the present embodiment, honeycomb shaping matrix is cordierite, mullite, carborundum, aluminium oxide, aluminum titanate, rustless steel, Aludirome, nickel alloy；Pore passage structure is triangle, circle, square, hexagon or octagon, hole density be 50 ~ 1200 mesh per square inch.
In the present embodiment, platinum-group noble metals be the one in platinum, palladium and rhodium, two or more；Nonferrous metal oxides be the one in manganese oxide, ferrum oxide, copper oxide, cobalt oxide, two or more；Rare-earth oxide is one or both in cerium oxide, lanthana；Molecular sieve be the one in ZSM-5, Beta, Y, modenite, two or more；High surface area carrier material be the one in aluminium oxide, silicon oxide, titanium oxide, zirconium oxide, aluminosilicate, two or more.
Fig. 1 is the flow chart that the exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst preparation process.
As it is shown in figure 1, exhaust pollution of diesel engines thing controls the preparation process of catalyst, comprise the steps:
Step one, by rare-earth oxide, high surface area carrier material, water and acid by ball milling, makes mixed slurry；
Step 2, the mixed slurry coated honeycomb shaping matrix made by step one, then make mixed slurry form fixing coating at honeycomb shaping matrix surface through drying, roasting；
Step 3, repeats the step of step 2, the most coated honeycomb shaping matrix, until it reaches default targeted loads amount；
Step 4, reaches step 3 the honeycomb shaping matrix with fixing coating of targeted loads amount, is impregnated in platinum-group noble metals precursor aqueous solution so that it is reaches the targeted loads amount of platinum-group noble metals, then makes fixed catalyst through drying, roasting.
In this example, step one also includes molecular sieve, with rare-earth oxide, high surface area carrier material, water and acid by ball milling, make mixed slurry；Step 3 is reached the honeycomb shaping matrix with fixing coating of targeted loads amount by described step 4, it is impregnated in platinum-group noble metals precursor aqueous solution and nonferrous metal oxides precursor aqueous solution, reach the targeted loads amount of platinum-group noble metals, nonferrous metal oxides, then make fixed catalyst through drying, roasting；In step 5, the targeted loads amount of platinum-group noble metals is 0.01-4g/L, and the targeted loads amount of nonferrous metal oxides is 1-20g/L；In described step 3, general objective load capacity is 22-285g/L, and the targeted loads amount of rare-earth oxide is 1-30g/L, and the targeted loads amount of molecular sieve is 1-35g/L, and the targeted loads amount of high-ratio surface support materials is 20 ~ 200g/L.
Preferably, in step 5, the targeted loads amount of platinum-group noble metals is 0.1-3g/L；The targeted loads amount of nonferrous metal oxides is 2-15g/L；The targeted loads amount of described step 3 middle rare earth metal-oxide is 2-20g/L, and the targeted loads amount of molecular sieve is 2-20g/L, and the targeted loads amount of high-ratio surface support materials is 30 ~ 150g/L.
The exhaust pollution of diesel engines thing used with DPF/CDPF collocation controls catalyst application in diesel engine, comprises the steps:
Step A, is loaded on exhaust pollution of diesel engines thing control catalyst sealing in the stainless steel casing of diesel engine；
Step B, is connected to diesel engine offgas outlet by the exhaust pollution of diesel engines thing encapsulated in step A control catalyst；
Step C, starts diesel engine so that it is operating condition, and engine exhaust flows through exhaust pollution of diesel engines thing and controls catalyst, and carbon monoxide and Hydrocarbon, at catalyst surface, are oxidized to carbon dioxide and steam；Nitric oxide is oxidized to nitrogen dioxide at catalyst surface, nitrogen dioxide has extremely strong oxidisability, the black smoke granule that can filter down Diesel engine black smoke particulate filter carries out autoxidation and removes, and is oxidized to carbon dioxide and discharges, thus realizes black smoke granule ground automatic regeneration；Black smoke granule is formed on carbon granule surface by liquid hydrocarbon and sulphuric acid absorption, and therefore, liquid hydrocarbon, as strong oxidizer, is oxidized to carbon dioxide, steam and nitric oxide by nitrogen dioxide gas.
Below in conjunction with specific experiment data, the present invention is specifically described:
Embodiment 1, high surface area carrier material selection aluminium oxide, rare-earth oxide selection cerium oxide and the mixture of lanthana, platinum-group noble metals selection platinum, palladium, the preparation process that exhaust pollution of diesel engines thing controls catalyst is as follows:
600g aluminium oxide, 300g cerium oxide, 30g lanthana, 1200ml water and 50ml nitric acid are respectively placed in same container and mix；Mixture is carried out ball milling 12 hours, makes mixed slurry；With the coated diameter 25mm of mixed slurry, length 50mm, hole density 400 mesh ceramic honeycomb matrix per square inch；Coated complete after be positioned over 125 DEG C in the environment of constant temperature drying 1 hour, then be positioned over 3 hours fixing coatings of roasting under the isoperibol of 550 DEG C.Repeat above-mentioned fixing coated, dry, the process of roasting, finally obtain195g/L load capacity.
Then, platinum-group noble metals platinum, the precursor aqueous solution Pt (NH of palladium are used3)4(NO3)2 With Pd (NO3)2Infused ceramic honeycomb substrate；Constant temperature drying 1 hour in the environment of being positioned over 125 DEG C after having impregnated, then it is positioned over roasting 3 hours under the isoperibol of 550 DEG C；The load capacity of last platinum-group noble metals is0.88g/L platinum, 0.36g/L palladium, 7g/L cerium oxide.
Embodiment 2:
High surface area carrier material selection aluminium oxide, rare-earth oxide selection cerium oxide and the mixture of lanthana, platinum-group noble metals selection platinum, palladium, the preparation process that exhaust pollution of diesel engines thing controls catalyst is as follows:
600g aluminium oxide, 300g cerium oxide, 30g lanthana, 1200ml water and 50ml nitric acid are respectively placed in same container and mix；Mixture is carried out ball milling 12 hours, makes mixed slurry；With the coated diameter 25mm of mixed slurry, length 50mm, hole density 400 mesh ceramic honeycomb matrix per square inch；Coated complete after be positioned over 125 DEG C in the environment of constant temperature drying 1 hour, then be positioned over 3 hours fixing coatings of roasting under the isoperibol of 550 DEG C.Repeat above-mentioned fixing coated, dry, the process of roasting, finally obtain195g/L load capacity.
Then, platinum-group noble metals platinum, the precursor aqueous solution Pt (NH of nonferrous metal oxides ferrum oxide are used3)4(NO3)2 、Pd(NO3)2With Fe (NO3)3Infused ceramic honeycomb substrate；Constant temperature drying 1 hour in the environment of being positioned over 125 DEG C after having impregnated, then it is positioned over roasting 3 hours under the isoperibol of 550 DEG C；The load capacity of last platinum-group noble metals is0.88g/L platinum, 0.36g/L palladium, 7g/L cerium oxide and 3.5g/L ferrum oxide.
Embodiment 3, high surface area carrier material selection aluminium oxide, rare-earth oxide selection cerium oxide and the mixture of lanthana, molecular sieve selection ZSM-5, platinum-group noble metals selection platinum, palladium, the preparation process that exhaust pollution of diesel engines thing controls catalyst is as follows:
600g aluminium oxide, 300g cerium oxide, 30g lanthana, 250g ZSM-5,1200ml water and 50ml nitric acid are respectively placed in same container and mix；Mixture is carried out 8 hours ball millings, makes mixed slurry；By the coated diameter 25mm of mixed slurry, long 50mm, hole density 400 mesh Aludirome honeycomb substrate per square inch；Coated complete after be positioned over 125 DEG C in the environment of constant temperature drying 1 hour, then be positioned over 3 hours fixing coatings of roasting under the isoperibol of 550 DEG C；Repeat above-mentioned fixing coated, dry, the process of roasting, coated obtain 205g/L load capacity.
Then, platinum-group noble metals platinum, palladium, the precursor aqueous solution Pt (NH of nonferrous metal oxides ferrum oxide are used3)4(NO3)2 、Pd(NO3)2With Fe (NO3)3Infused ceramic honeycomb substrate；Constant temperature drying 1 hour in the environment of being positioned over 125 DEG C after having impregnated, then it is positioned over roasting 3 hours under the isoperibol of 550 DEG C；The load capacity of last platinum-group noble metals is0.88g/L platinum, 0.36g/L palladium, 7g/L cerium oxide and 3.5g/L ferrum oxide.
Reference examples, high surface area carrier material selection aluminium oxide, platinum-group noble metals selection platinum, the preparation process that exhaust pollution of diesel engines thing controls catalyst is as follows:
600g aluminium oxide and 1000ml water are respectively placed in same container and mix；Mixture is carried out 12 hours ball millings, makes mixed slurry；With the coated 25mm diameter of mixed slurry, 50mm length, the ceramic honeycomb matrix of 400 mesh hole density per square inch；Often walk and coated dry 1 hour and 550 DEG C of roastings 3 hours through 125 DEG C；Coated complete after be positioned over 125 DEG C in the environment of constant temperature drying 1 hour, then be positioned over 3 hours fixing coatings of roasting under the isoperibol of 550 DEG C；Repeat above-mentioned fixing coated, dry, the process of roasting, coated obtain 110g/L load capacity.
Then, by the precursor aqueous solution Pt (NH of platinum-group noble metals platinum3)4(NO3)2, then with precursor aqueous solution Pt (NH3)4(NO3)2Dipping Aludirome honeycomb substrate, constant temperature drying 1 hour in the environment of being positioned over 125 DEG C after having impregnated, then it is positioned over roasting 3 hours under the isoperibol of 550 DEG C, final platinum load capacity is 0.88g/L.
(1) oxidation activity of carbon monoxide and Hydrocarbon is estimated by embodiment 2, embodiment 3, reference examples respectively:
First 3 kinds of exhaust pollution of diesel engines things control catalyst embodiment 2, embodiment 3, reference examples made are individually positioned on fixed bed reactors and react；Reaction condition is 500ppmCarbon monoxide, 250ppm propylene and 2% water vapour, 40000 turns/h of catalyst space velocities.
Fig. 2 is 3 kinds of catalyst using respectively of embodiment 2, embodiment 3, reference examples to carbon monoxide and propylene oxidation activity with the change curve of reaction temperature, as in figure 2 it is shown, embodiment 2, embodiment 3 have high carbon monoxide and propylene oxidation activity.The initiation temperature when conversion ratio of carbon monoxide and propylene is 50% in embodiment 2 is respectively 156 DEG C and 201 DEG C.When in embodiment 3, the conversion ratio of carbon monoxide and propylene is 50%, initiation temperature is respectively 148 DEG C and 194 DEG C.Under the same terms, when carbon monoxide in reference examples and the conversion ratio of propylene are 50%, initiation temperature is respectively 170 DEG C and 212 DEG C.
(2) nitric oxide production oxidation activity is estimated by embodiment 2, embodiment 3, reference examples respectively:
First 3 kinds of exhaust pollution of diesel engines things control catalyst embodiment 2, embodiment 3, reference examples made are individually positioned on fixed bed reactors and react；Reaction condition is 500ppmCarbon monoxide, 250ppm nitric oxide and 2% water vapour, 40000 turns/h of catalyst space velocities.
Fig. 3 is the activity change curve with reaction temperature that 3 kinds of catalyst for nitrogen monoxide that embodiment 2, embodiment 3, reference examples use respectively are oxidized to nitrogen dioxide, as it is shown on figure 3, embodiment 2, embodiment 3 have higher to nitric oxide production oxidation activity.When in embodiment 2, nitric oxide production conversion ratio is 50%, initiation temperature is 221 DEG C.When in embodiment 3, nitric oxide production conversion ratio is 50%, initiation temperature is 211 DEG C.Under the same terms, when in reference examples, nitric oxide production conversion ratio is 50%, initiation temperature is 268 DEG C.
The present invention uses honeycomb shaping matrix, platinum-group noble metals, nonferrous metal oxides, rare-earth oxide, molecular sieve, high surface area carrier material, water to be made into exhaust pollution of diesel engines thing control catalyst, remove the pollutant in tail gas, can effectively reduce harmful pollution substrate concentration in diesel engine emissions, novel formula, ratio is any, operation is more prone to, and compensate for the blank in industry.
Exhaust pollution of diesel engines thing controls the preparation process of catalyst and uses ball milling, drying, the method for roasting, and technique is simple, step science, processing ease.
The present invention in use, exhaust pollution of diesel engines thing control catalyst be first encapsulated in metal shell, be connected in diesel motor exhaust emissions passage.Diesel motor tail gas flows through honeycomb shaping catalyst, carbon monoxide and Hydrocarbon at catalyst surface, is oxidized to carbon dioxide and steam；Nitric oxide, at catalyst surface, is oxidized to nitrogen dioxide；By the concentration of pollutant in emission before and after comparing catalyst and installing, the efficiency of catalyst can be calculated.Under normal circumstances, add exhaust pollution of diesel engines thing and control diesel oil function reduction by 50 ~ 95% carbon monoxides, 40 ~ 90% Hydrocarbon of catalyst；The ratio that pollutant conversion of nitric oxide gas becomes nitrogen dioxide is 10 ~ 70%, and nitrogen dioxide falls as strong oxidizer, the black dust granules PM that DPF/CDPF can be filtered down, the most automatically regeneration, and also referred to as second-time burning is fallen；Greatly reduce the discharge of pollutant, improve environmental conservation ability, more meet environmental protection concept.
More than display describes the ultimate principle of the present invention, principal character and advantages of the present invention.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; the principle that the present invention is simply described described in above-described embodiment and description; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements both fall within scope of the claimed invention.Claimed scope is defined by appending claims and equivalent thereof.