三维介孔Co-CeO2逆水煤气变换反应催化剂的研究

In the background of carbon dioxide conversion, the project studies the preparation of three-dimensional mesoporous Co-CeO2 catalysts,and applies it to reverse water-gas shift reaction.The project's objective is to use the confinement effect of three-dimensional mesoporous materials to improve the selectivity and thermal stability of Co-CeO2 catalysts, use the high diffusion performance of three-dimensional mesoporous materials to increase the activity. It applies template method to prepare three-dimensional mesoporous Co-CeO2 catalysts, and studies the preparation techniques and basic theory of three-dimensional mesoporous Co-CeO2 catalysts. Combined with characterization results and catalytic test experiments, it researches confinement effect and interface effect on the catalytic performance, and clarifies the catalyst structure-activity relationship. The objectives of this project are to slove the poor thermal stability and methanation problems of traditional Co-CeO2 catalysts, and to provide new design ideas and theoretical foundation for the research of reverse water-gas shift catalysts.

本项目以二氧化碳转化为背景，研究制备三维介孔Co-CeO2催化剂，用于逆水煤气变换反应，旨在利用其限域效应提高Co-CeO2催化剂的选择性和热稳定性，利用其高扩散性能提高催化剂的活性。本项目通过模板法制备三维介孔Co-CeO2催化剂，研究其制备技术和基础理论；通过催化剂表征和性能评价，研究三维介孔Co-CeO2催化剂的限域效应和界面效应对催化性能的影响，阐明催化剂构效关系；以期解决传统方法制备Co-CeO2催化剂热稳定性差、易发生甲烷化反应的缺点，为逆水煤气变换催化剂研究提供新的设计思路和理论基础。

本项目以二氧化碳转化为背景，研究制备了三维介孔Co-CeO2催化剂，用于逆水煤气变换反应，利用其限域效应提高Co-CeO2催化剂的选择性和热稳定性。本项目通过SBA-16、硅溶胶、FDU-12不同模板法，制备了一系列三维介孔Co-CeO2催化剂。FDU-12为模板制备的催化剂稳定性较差，SBA-16和硅溶胶为模板制备的催化剂性能较好。利用硅溶胶为模板，通过胶体溶液燃烧法制备的催化剂比表面积较大，金属分散度高，催化剂活性和稳定性较好。通过催化剂表征和性能评价，研究了胶体溶液燃烧法制备Co-CeO2催化剂的的构效关系，发现钴颗粒高度分散在笼状结构的介孔孔壁中，保障了催化剂的选择性和稳定性。通过胶体溶液燃烧法制备高分散介孔钴铈催化剂，解决了传统方法制备催化剂热稳定性差、易发生甲烷化反应等缺点，同时也为其他高温热稳定催化剂研究提供新的催化剂制备方法。