助剂对Co/SiO_(2)催化剂逆水煤气变换反应催化性能的影响  

Effect of promoters on catalytic performance of Co/SiO_(2)catalysts for reverse water-gas shift reaction

作　　者：曹忠 刘宁 崔莎 刘辉 王路辉 CAO Zhong;LIU Ning;CUI Sha;LIU Hui;WANG Luhui(Zhejiang Provincial Key Laboratory of Petrochemical Pollution Control,Zhejiang Ocean University,Zhoushan 316022,Zhejiang,China;School of Petrochemical Engineering and Environment,Zhejiang Ocean University,Zhoushan 316022,Zhejiang,China;School of Food and Pharmaceutical,Zhejiang Ocean University,Zhoushan 316022,Zhejiang,China;National-Local Joint Engineering Laboratory of Harbor Oil&Gas Storage and Transportation Technology,Zhejiang Ocean University,Zhoushan 316022,Zhejiang,China)

机构地区：[1]浙江海洋大学浙江省石油化工环境污染控制重点实验室,浙江舟山316022 [2]浙江海洋大学石油化工与环境学院,浙江舟山316022 [3]浙江海洋大学食品与药学学院,浙江舟山316022 [4]浙江海洋大学临港石油天然气储运技术国家地方联合工程研究中心,浙江舟山316022

出　　处：《低碳化学与化工》2023年第6期24-29,共6页Low-Carbon Chemistry and Chemical Engineering

基　　金：国家自然科学基金(21406206);舟山市科学技术局浙江海洋大学科技专项重点项目(2022C41002);浙江省石油化工环境污染控制重点实验室开放基金(2021Z01)。

摘　　要：逆水煤气变换(RWGS)反应是二氧化碳(CO_(2))转化的有效途径之一,然而高温反应条件下RWGS催化剂存在稳定性差的问题。利用等体积浸渍法制备了一系列添加助剂(CeO_(2)、La_(2)O_(3)、Y_(2)O_(3)或ZrO_(2))的Co/SiO_(2)催化剂用于RWGS反应,通过X射线衍射仪、透射电子显微镜和H_(2)程序升温还原等对催化剂进行了表征,研究了助剂对催化剂结构及其RWGS反应性能的影响。催化剂表征结果表明,添加助剂对催化剂中Co3O4粒径没有明显影响;CeO_(2)、La_(2)O_(3)、Y_(2)O_(3)和ZrO_(2)助剂与钴组分存在相互作用。催化性能测试结果表明,600°C下反应12 h后,Co/SiO_(2)催化剂的CO_(2)转化率由28.3%下降到9.0%;而添加助剂的催化剂稳定性均有提高,其中Co-ZrO_(2)/SiO_(2)催化剂的稳定性最佳,反应12 h后CO_(2)转化率仍高达21.9%。这是由于加入助剂后,助剂与钴组分存在相互作用,提高了活性组分钴的稳定性。The reverse water-gas shift(RWGS)reaction is one of the effective ways of carbon dioxide(CO_(2))conversion.However,the RWGS catalyst has the problem of poor stability under high temperature.A series of Co/SiO_(2)catalysts with promoters(CeO_(2),La_(2)O_(3),Y_(2)O_(3)or ZrO_(2))were prepared by incipient-wetness impregnation method for the RWGS reaction.The catalysts were characterized by X-ray diffractometry,transmission electron microscopy and H2-programmed temperature reduction,etc.The effects of promoters on the catalyst structure and RWGS reaction performance were studied.The results of catalyst characterization show that the particle size of Co3O4 in the catalyst is not significantly changed by adding promoters.The promoters of CeO_(2),La_(2)O_(3),Y_(2)O_(3)and ZrO_(2)interacte with the cobalt component.The catalytic performance test results show that the CO_(2)conversion rate of the Co/SiO_(2)catalysts decreases from 28.3%to 9.0%after reaction at 600°C for 12 h.The stability of the catalysts with promoters is improved,and the Co-ZrO_(2)/SiO_(2)catalyst has the best stability,and the CO_(2)conversion rate is still as high as 21.9%after reaction for 12 h.This is due to the presence of interaction between the promoters and the cobalt component after the addition of the promoters,which improves the stability of the active component of cobalt.

关 键 词：逆水煤气变换反应 助剂 Co/SiO_(2) 等体积浸渍法 CO_(2)转化 

分 类 号：TQ426[化学工程] O643[理学—物理化学]