技术领域technical field
本发明属于材料技术领域，具体涉及一种用于吸附烟气中二氧化碳的双功能化KIT-6/ZSM-5的制备方法。The invention belongs to the technical field of materials, and in particular relates to a preparation method of a bifunctional KIT-6/ZSM-5 for absorbing carbon dioxide in flue gas.
背景技术Background technique
工业革命以来，人类活动使二氧化碳排放量逐年上升，造成全球平均气温上升和平均海拔增加等现象，影响到人类和动植物的健康。因此，如何降低烟气中二氧化碳的排放量是一项重要的环保工作。常见的二氧化碳分离技术有氨溶液吸收法、低温蒸馏法、多孔固体吸附法和膜净化法等。其中，多孔固体吸附法由于具有吸附剂价格低、吸附/脱附速率快、使用寿命长、可再生循环等优点已经成为吸附二氧化碳的一种具有前景的方法。Since the Industrial Revolution, human activities have increased carbon dioxide emissions year by year, causing global average temperature rises and average altitude increases, affecting the health of humans, animals and plants. Therefore, how to reduce the emission of carbon dioxide in flue gas is an important environmental protection work. Common carbon dioxide separation technologies include ammonia solution absorption, cryogenic distillation, porous solid adsorption, and membrane purification. Among them, the porous solid adsorption method has become a promising method for adsorbing carbon dioxide due to the advantages of low price of adsorbent, fast adsorption/desorption rate, long service life, and renewable cycle.
自微孔-介孔复合分子筛问世以来，就一直受到大量研究者的重点关注。微孔-介孔复合分子筛弥补了微孔孔径小造成的分子扩散阻力大、介孔材料无定型且较薄的孔壁引起的稳定性能较弱的缺点，是一种潜在的吸附剂。微孔-介孔复合分子筛KIT-6/ZSM-5同时具有KIT-6空间群Ia3d结构和ZSM-5十元环网层结构，能够在吸附过程中形成协同作用。目前该材料仅有为数不多的经过金属改性应用于催化方面的报道。但至今并无关于采用微孔-介孔复合分子筛KIT-6/ZSM-5为载体，三氨基硅烷偶联剂为嫁接过程中的一次改性剂，四乙烯五胺(TEPA)或聚乙烯亚胺(PEI)为浸渍过程中的二次改性剂，采用先嫁接后浸渍的方法合成双功能化KIT-6/ZSM-5复合分子筛的报道，也没有关于该双功能化KIT-6/ZSM-5复合分子筛吸附烟气中二氧化碳的研究报道。Since the advent of microporous-mesoporous composite molecular sieves, it has been the focus of a large number of researchers. Microporous-mesoporous composite molecular sieves make up for the disadvantages of large molecular diffusion resistance caused by small pore diameters and weak stability caused by amorphous and thin pore walls of mesoporous materials, and are a potential adsorbent. The microporous-mesoporous composite molecular sieve KIT-6/ZSM-5 has both KIT-6 space group Ia3d structure and ZSM-5 ten-membered ring network layer structure, which can form a synergistic effect in the adsorption process. At present, there are only a few reports on the application of this material in catalysis after metal modification. But so far there is no information on the use of microporous-mesoporous composite molecular sieve KIT-6/ZSM-5 as the carrier, triaminosilane coupling agent as the primary modifier in the grafting process, tetraethylenepentamine (TEPA) or polyethylene Amine (PEI) is the secondary modifier in the impregnation process, and the method of grafting first and then impregnating is used to synthesize the bifunctional KIT-6/ZSM-5 composite molecular sieve, and there is no report on the bifunctional KIT-6/ZSM -5 Composite Molecular Sieve Adsorption of Carbon Dioxide in Flue Gas Research Report.
本项专利采用微孔-介孔复合分子筛KIT-6/ZSM-5为载体，三氨基硅烷偶联剂为嫁接过程中的一次改性剂，四乙烯五胺(TEPA)或聚乙烯亚胺(PEI)为浸渍过程中的二次改性剂，采用先嫁接后浸渍的方法合成双功能化KIT-6/ZSM-5，这种材料保持了原有微孔-介孔复合分子筛的优异性能，同时大大提高了材料吸附二氧化碳的性能，在烟气中二氧化碳的吸附方面具有广阔的应用前景。This patent uses microporous-mesoporous composite molecular sieve KIT-6/ZSM-5 as the carrier, triaminosilane coupling agent as the primary modifier in the grafting process, tetraethylenepentamine (TEPA) or polyethyleneimine ( PEI) is the secondary modifier in the impregnation process. The bifunctional KIT-6/ZSM-5 is synthesized by the method of first grafting and then impregnation. This material maintains the excellent performance of the original microporous-mesoporous composite molecular sieve. At the same time, the performance of the material to adsorb carbon dioxide is greatly improved, and it has broad application prospects in the adsorption of carbon dioxide in flue gas.
发明内容Contents of the invention
本发明专利的目的在于提供一种用于吸附烟气中二氧化碳的双功能化KIT-6/ZSM-5的制备方法，该方法采用如下技术方案：The purpose of the patent of the present invention is to provide a preparation method of bifunctional KIT-6/ZSM-5 for absorbing carbon dioxide in flue gas. The method adopts the following technical scheme:
根据本发明的一个作为吸附剂用于吸附烟气中二氧化碳的应用方面，提供一种用于吸附烟气中二氧化碳的双功能化KIT-6/ZSM-5的制备方法，包括以下步骤：According to an application aspect of the present invention as an adsorbent for adsorbing carbon dioxide in flue gas, a preparation method for bifunctional KIT-6/ZSM-5 for adsorbing carbon dioxide in flue gas is provided, comprising the following steps:
步骤1.混合16.87ml H2O和4.54g四丙基氢氧化铵(TPAOH)，在室温、350r/min下搅拌0.5h，加入0.167g异丙醇铝搅拌均匀；随后将13.6ml正硅酸乙酯(TEOS)逐渐加入到溶液中，在35℃、450r/min下剧烈搅拌2h，然后在150℃的高压反应釜中陈化10h，待冷却至室温，将所产生的预制沸石记做S1；将4g P123溶解在125ml H2O和6.36ml HCl中，在35℃、350r/min下搅拌2h，然后加入4.95ml正丁醇(BuOH)，继续搅拌1h，混合溶液记做S2；将S1均匀滴加到S2中，以制备出具有一定摩尔组成的凝胶，最终凝胶摩尔组成为TEOS:P123:BuOH:HCl:Al:H2O＝1:0.017:1.31:1.83:0.02:195:0.138；在40℃、450r/min下连续搅拌凝胶24h，之后转移到反应釜，在静态条件100℃下加热24h，通过过滤、洗涤、100℃干燥、550℃煅烧6h后，得到固体产物KIT-6/ZSM-5复合分子筛；Step 1. Mix 16.87ml H2 O and 4.54g tetrapropylammonium hydroxide (TPAOH), stir at room temperature and 350r/min for 0.5h, add 0.167g aluminum isopropoxide and stir well; then add 13.6ml orthosilicate Ethyl ester (TEOS) was gradually added into the solution, stirred vigorously at 35°C and 450r/min for 2h, and then aged in a high-pressure reactor at 150°C for 10h. After cooling to room temperature, the resulting prefabricated zeolite was recorded as S1 ; Dissolve 4g P123 in 125ml H2 O and 6.36ml HCl, stir at 35°C and 350r/min for 2h, then add 4.95ml n-butanol (BuOH), continue stirring for 1h, and record the mixed solution as S2 ; Evenly add S1 to S2 dropwise to preparea gel with a certain molar composition, and the final gel molar composition is TEOS:P123:BuOH:HCl:Al:H2 O=1 :0.017:1.31:1.83: 0.02:195:0.138; Stir the gel continuously at 40°C and 450r/min for 24h, then transfer to the reactor, heat at 100°C for 24h under static conditions, filter, wash, dry at 100°C, and calcined at 550°C for 6h, Obtain solid product KIT-6/ZSM-5 composite molecular sieve;
步骤2.将1g步骤1中所得的KIT-6/ZSM-5复合分子筛加入到装有60ml甲苯的圆底烧瓶中混匀，然后用移液枪加入1ml密度接近于1.0g/ml的三氨基硅烷偶联剂，将上述混合样加热冷凝回流12h，真空抽滤并用无水乙醇反复洗涤；最后，将抽滤后得到的浆状物置于100℃的烘箱中干燥12h，即得到三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5；Step 2. Add 1g of the KIT-6/ZSM-5 composite molecular sieve obtained in step 1 to a round-bottomed flask filled with 60ml of toluene and mix well, then add 1ml of triamine with a density close to 1.0g/ml with a pipette gun As a silane coupling agent, heat and condense the above mixed sample to reflux for 12 hours, vacuum filter and wash repeatedly with absolute ethanol; finally, dry the slurry obtained after suction filtration in an oven at 100°C for 12 hours to obtain triaminosilane coupling agent Joint-grafted KIT-6/ZSM-5;
步骤3.将500-700mg步骤2中所得的三氨基硅烷偶联剂嫁接的ZSM-5/KIT-6加入到装有25ml溶剂的锥形瓶中混匀，加入300-750mg胺类物质，混合均匀，置于磁力加热搅拌器中，在400r/min和室温下搅拌7h，然后置于80℃烘箱中蒸发去掉溶剂，再置于通风干燥箱中，100℃下干燥得到双功能化KIT-6/ZSM-5。Step 3. Add 500-700mg of the ZSM-5/KIT-6 grafted with the triaminosilane coupling agent obtained in step 2 into a conical flask containing 25ml of solvent and mix well, add 300-750mg of amine substances, mix Evenly, put it in a magnetic heating stirrer, stir at 400r/min and room temperature for 7h, then put it in an oven at 80°C to evaporate the solvent, then put it in a ventilated drying oven, and dry it at 100°C to obtain a bifunctional KIT-6 /ZSM-5.
进一步的，在上述步骤2中，所述三氨基硅烷偶联剂为二乙烯三胺基丙基三甲氧基硅烷(AAAPTS)。Further, in the above step 2, the triaminosilane coupling agent is divinyltriaminopropyltrimethoxysilane (AAAPTS).
进一步的，所述胺类物质的质量分数为30％-60％。Further, the mass fraction of the amines is 30%-60%.
进一步的，在上述步骤3中，将500mg步骤2中所得的三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5加入到装有25ml溶剂的锥形瓶中混匀，加入750mg胺类物质，混合均匀，置于磁力加热搅拌器中，在400r/min和室温下搅拌7h，然后置于80℃烘箱中蒸发去掉溶剂，再置于通风干燥箱中，100℃下干燥得到双功能化KIT-6/ZSM-5。Further, in the above step 3, add 500 mg of the KIT-6/ZSM-5 grafted with the triaminosilane coupling agent obtained in step 2 to a conical flask containing 25 ml of solvent and mix well, add 750 mg of amine substances , mixed evenly, placed in a magnetic heating stirrer, stirred at 400r/min and room temperature for 7h, then placed in an oven at 80°C to evaporate the solvent, then placed in a ventilated drying oven, and dried at 100°C to obtain a bifunctional KIT -6/ZSM-5.
进一步的，所述溶剂为无水乙醇。Further, the solvent is absolute ethanol.
进一步的，所述胺类物质的质量分数为60％。Further, the mass fraction of the amines is 60%.
进一步的，所述胺类物质为TEPA或PEI。Further, the amine substance is TEPA or PEI.
本发明的有益效果是：用AAAPTS改性KIT-6/ZSM-5，在400r/min转速和室温的温和条件下，偶联剂能增强TEPA或PEI的负载效果，得到具有优良吸附性能的双功能化微孔-介孔复合分子筛。并将其用到气体中二氧化碳的吸附，在75℃条件下，对氮气/二氧化碳混合气体(二氧化碳的体积分数为15％)的最大吸附量为6.28mmol/g。The beneficial effects of the present invention are: modifying KIT-6/ZSM-5 with AAAPTS, under the mild conditions of 400r/min rotation speed and room temperature, the coupling agent can enhance the loading effect of TEPA or PEI, and obtain a double Functionalized microporous-mesoporous composite molecular sieves. And it is used for the adsorption of carbon dioxide in the gas. Under the condition of 75°C, the maximum adsorption capacity of nitrogen/carbon dioxide mixed gas (the volume fraction of carbon dioxide is 15%) is 6.28mmol/g.
特点：采用先嫁接后浸渍的方法将胺基有效地固定在结合了介孔孔径较大且可调和微孔材料高稳定性双重优点的微孔-介孔复合分子筛上，增强材料的稳定性和吸附性能。该吸附剂制备过程生产条件简单，便于操作，生产成本低，吸附效果良好，对环境污染小，具有良好的应用前景。Features: The amine group is effectively fixed on the microporous-mesoporous composite molecular sieve that combines the dual advantages of large and adjustable mesoporous pore size and high stability of microporous materials by grafting first and then impregnating, enhancing the stability and stability of the material. Adsorption properties. The preparation process of the adsorbent has simple production conditions, convenient operation, low production cost, good adsorption effect, little environmental pollution and good application prospect.
附图说明Description of drawings
图1是双功能化KIT-6/ZSM-5(AZK-TX和AZK-PX)的二氧化碳吸附量随胺负载量变化图。Figure 1 is a graph of the carbon dioxide adsorption capacity of bifunctional KIT-6/ZSM-5 (AZK-TX and AZK-PX) as a function of amine loading.
图2是双功能化KIT-6/ZSM-5(AZK-T60和AZK-P50)的二氧化碳吸附量随温度变化图。Figure 2 is a graph of the carbon dioxide adsorption capacity of the bifunctional KIT-6/ZSM-5 (AZK-T60 and AZK-P50) as a function of temperature.
图3是75℃下双功能化KIT-6/ZSM-5(AZK-T60和AZK-P50)的二氧化碳吸附量随时间变化图。Fig. 3 is a graph of the carbon dioxide adsorption capacity of bifunctional KIT-6/ZSM-5 (AZK-T60 and AZK-P50) as a function of time at 75°C.
具体实施方式detailed description
下面结合附图和具体实施方式对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例1：KIT-6/ZSM-5复合分子筛的制备Embodiment 1: the preparation of KIT-6/ZSM-5 composite molecular sieve
混合16.87ml H2O和4.54g四丙基氢氧化铵(TPAOH)，在室温、350r/min下搅拌0.5h，加入0.167g异丙醇铝搅拌均匀。随后将13.6ml正硅酸乙酯(TEOS)逐渐加入到溶液中，在35℃、450r/min下剧烈搅拌2h，然后在150℃的高压反应釜中陈化10h，待冷却至室温，将所产生的预制沸石记做S1。将4g P123溶解在125ml H2O和6.36ml HCl中，在35℃、350r/min下搅拌2h，然后加入4.95ml正丁醇(BuOH)，继续搅拌1h，混合溶液记做S2。将S1均匀滴加到S2中，以制备出具有一定摩尔组成的凝胶，最终凝胶摩尔组成为TEOS:P123:BuOH:HCl:Al:H2O＝1:0.017:1.31:1.83:0.02:195:0.138。在40℃、450r/min下连续搅拌凝胶24h，之后转移到反应釜，在静态条件100℃下加热24h，通过过滤、洗涤、100℃干燥、550℃煅烧6h后，得到固体产物KIT-6/ZSM-5复合分子筛。Mix 16.87ml of H2 O and 4.54g of tetrapropylammonium hydroxide (TPAOH), stir at room temperature and 350r/min for 0.5h, add 0.167g of aluminum isopropoxide and stir well. Then 13.6ml tetraethyl orthosilicate (TEOS) was gradually added into the solution, vigorously stirred at 35°C and 450r/min for 2h, then aged in an autoclave at 150°C for 10h, cooled to room temperature, and the The resulting prefabricated zeolite is denoted as S1 . Dissolve 4g of P123 in 125ml of H2 O and 6.36ml of HCl, stir at 35°C and 350r/min for 2h, then add 4.95ml of n-butanol (BuOH), continue stirring for 1h, and record the mixed solution as S2 . Evenly add S1 to S2 dropwise to preparea gel with a certain molar composition, and the final gel molar composition is TEOS:P123:BuOH:HCl:Al:H2 O=1 :0.017:1.31:1.83: 0.02:195:0.138. The gel was continuously stirred at 40°C and 450r/min for 24h, then transferred to the reactor, heated at 100°C for 24h under static conditions, filtered, washed, dried at 100°C, and calcined at 550°C for 6h to obtain the solid product KIT-6 /ZSM-5 composite molecular sieve.
实施例2：三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5的制备Example 2: Preparation of KIT-6/ZSM-5 grafted with triaminosilane coupling agent
将1g实施例1中所得的KIT-6/ZSM-5复合分子筛加入到装有60ml甲苯的圆底烧瓶中混匀，然后用移液枪加入1ml密度接近于1.0g/ml的三氨基硅烷偶联剂，将上述混合样加热冷凝回流12h，真空抽滤并用无水乙醇反复洗涤。最后，将抽滤后得到的浆状物置于100℃的烘箱中干燥12h，即得到三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5。Add 1 g of the KIT-6/ZSM-5 composite molecular sieve obtained in Example 1 into a round-bottomed flask equipped with 60 ml of toluene and mix well, then add 1 ml of triaminosilane with a density close to 1.0 g/ml with a pipette gun The above mixed sample was heated and condensed to reflux for 12 hours, vacuum filtered and washed repeatedly with absolute ethanol. Finally, the slurry obtained after suction filtration was dried in an oven at 100° C. for 12 hours to obtain KIT-6/ZSM-5 grafted with a triaminosilane coupling agent.
实施例3：双功能化KIT-6/ZSM-5的制备Example 3: Preparation of bifunctional KIT-6/ZSM-5
将700mg实施例2中所得的三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5加入到装有25ml无水乙醇的锥形瓶中混匀，加入300mg质量分数为30％的TEPA或PEI，混合均匀，置于磁力加热搅拌器中，在400r/min和室温下搅拌7h，然后置于80℃烘箱中蒸发去掉溶剂，再置于通风干燥箱中，100℃下干燥得到双功能化KIT-6/ZSM-5。Add 700 mg of the KIT-6/ZSM-5 grafted with the triaminosilane coupling agent obtained in Example 2 into a conical flask filled with 25 ml of absolute ethanol and mix well, add 300 mg of TEPA or PEI with a mass fraction of 30% , mixed evenly, placed in a magnetic heating stirrer, stirred at 400r/min and room temperature for 7h, then placed in an oven at 80°C to evaporate the solvent, then placed in a ventilated drying oven, and dried at 100°C to obtain a bifunctional KIT -6/ZSM-5.
实施例4：双功能化KIT-6/ZSM-5的制备Example 4: Preparation of bifunctional KIT-6/ZSM-5
将600mg实施例2中所得的三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5加入到装有25ml无水乙醇的锥形瓶中混匀，加入600mg质量分数为50％的TEPA或PEI，混合均匀，置于磁力加热搅拌器中，在400r/min和室温下搅拌7h，然后置于80℃烘箱中蒸发去掉溶剂，再置于通风干燥箱中，100℃下干燥得到双功能化KIT-6/ZSM-5。Add 600mg of the KIT-6/ZSM-5 grafted with the triaminosilane coupling agent obtained in Example 2 into a conical flask filled with 25ml of absolute ethanol and mix well, add 600mg of TEPA or PEI with a mass fraction of 50% , mixed evenly, placed in a magnetic heating stirrer, stirred at 400r/min and room temperature for 7h, then placed in an oven at 80°C to evaporate the solvent, then placed in a ventilated drying oven, and dried at 100°C to obtain a bifunctional KIT -6/ZSM-5.
实施例5：双功能化KIT-6/ZSM-5的制备Example 5: Preparation of bifunctional KIT-6/ZSM-5
将500mg实施例2中所得的三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5加入到装有25ml无水乙醇的锥形瓶中混匀，加入750mg质量分数为60％的TEPA或PEI，混合均匀，置于磁力加热搅拌器中，在400r/min和室温下搅拌7h，然后置于80℃烘箱中蒸发去掉溶剂，再置于通风干燥箱中，100℃下干燥得到双功能化KIT-6/ZSM-5。Add 500mg of the KIT-6/ZSM-5 grafted with the triaminosilane coupling agent obtained in Example 2 into a conical flask filled with 25ml of absolute ethanol and mix well, add 750mg of TEPA or PEI with a mass fraction of 60% , mixed evenly, placed in a magnetic heating stirrer, stirred at 400r/min and room temperature for 7h, then placed in an oven at 80°C to evaporate the solvent, then placed in a ventilated drying oven, and dried at 100°C to obtain a bifunctional KIT -6/ZSM-5.
上述实施例1制备的KIT-6/ZSM-5可以被命名为ZK；上述实施例2制备的三氨基硅烷偶联剂嫁接的KIT-6/ZSM-5可以被命名为AZK；上述实施例3、实施例4及实施例5制备的双功能化KIT-6/ZSM-5可以被命名为AZK-TX或AZK-PX。其中A为二乙烯三胺基丙基三甲氧基硅烷(AAAPTS)简称，T为TEPA简称，P为PEI简称，X为胺的负载量；例如PEI质量分数为50％，表示为AZK-P50。The KIT-6/ZSM-5 prepared in the above example 1 can be named ZK; the KIT-6/ZSM-5 grafted with the triaminosilane coupling agent prepared in the above example 2 can be named AZK; the above example 3 The bifunctional KIT-6/ZSM-5 prepared in Example 4 and Example 5 can be named AZK-TX or AZK-PX. Among them, A is the abbreviation of divinyltriaminopropyltrimethoxysilane (AAAPTS), T is the abbreviation of TEPA, P is the abbreviation of PEI, and X is the load of amine; for example, if the mass fraction of PEI is 50%, it is expressed as AZK-P50.
实施例6：将上述实施例3、实施例4及实施例5得到的双功能化KIT-6/ZSM-5用于吸附气体中二氧化碳。在60℃条件下，TEPA改性系列对氮气/二氧化碳混合气体(二氧化碳的体积分数为15％)的吸附量依次为4.42mmol/g、5.6mmol/g和5.91mmol/g；而PEI改性系列则依次为3.3mmol/g、4.19mmol/g和4.07mmol/g。在60-90℃内，AZK-T60的吸附量依次为5.91mmol/g、6.28mmol/g和6.21mmol/g；而AZK-P50则依次为4.19mmol/g、4.69mmol/g和4.54mmol/g。其中实施例5得到的双功能化KIT-6/ZSM-5(AZK-T60)在75℃下有最大的吸附量，为6.28mmol/g。Example 6: The bifunctional KIT-6/ZSM-5 obtained in Example 3, Example 4 and Example 5 above was used to adsorb carbon dioxide in gas. At 60°C, the adsorption capacity of TEPA modified series to nitrogen/carbon dioxide mixed gas (the volume fraction of carbon dioxide is 15%) is 4.42mmol/g, 5.6mmol/g and 5.91mmol/g; while PEI modified series Then they are 3.3mmol/g, 4.19mmol/g and 4.07mmol/g in turn. At 60-90°C, the adsorption capacity of AZK-T60 is 5.91mmol/g, 6.28mmol/g and 6.21mmol/g; while that of AZK-P50 is 4.19mmol/g, 4.69mmol/g and 4.54mmol/g g. Among them, the bifunctional KIT-6/ZSM-5 (AZK-T60) obtained in Example 5 has the maximum adsorption capacity at 75° C., which is 6.28 mmol/g.
从图3可以看出本次发明的材料对二氧化碳的吸附是一个先快后慢的过程，且在短时间内完成吸附，说明该材料对二氧化碳具有较强的吸附力和亲合力，较短的吸附时间和较强的吸附能力有利于实际应用。It can be seen from Figure 3 that the adsorption of carbon dioxide by the material of this invention is a process of first fast and then slow, and the adsorption is completed in a short time, indicating that the material has strong adsorption and affinity for carbon dioxide, and the adsorption time is relatively short. Time and strong adsorption capacity are beneficial for practical application.
本示例实施例以复合分子筛ZK为载体，采用AAAPTS为一次改性剂，TEPA或PEI为二次改性剂，合成出具有良好的二氧化碳吸附性能的双功能化KIT-6/ZSM-5，该材料在烟气中二氧化碳的捕获方面具有广阔的应用前景。In this exemplary embodiment, a composite molecular sieve ZK is used as a carrier, AAAPTS is used as a primary modifier, and TEPA or PEI is used as a secondary modifier to synthesize a bifunctional KIT-6/ZSM-5 with good carbon dioxide adsorption performance. The material has broad application prospects in the capture of carbon dioxide in flue gas.
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