Effects of surface groups on Fe/ZnO catalysts for CO2 hydrogenation to olefin
APPLIED SURFACE SCIENCE(2024)
摘要
Control of product distribution over CO2-FTO is challenging due to the difficulty in governing the C-C coupling of CHx species. Surface modification to iron catalysts shows potential but its role remains indistinct. Fe/ZnO was used as a model catalyst to investigate the effects of the surface groups on its catalytic performance for CO2-FTO. On hydroxyl group modified Fe/ZnO by H2O2-treatment, at 1000 h-1, 300 degrees C, and 1 MPa, the CO2 conversion, and the C4+ linear alpha-olefin selectivity rose to 50.2 % and 48.1 %, respectively. Alkyl group modified Fe/ZnO by stearic acid treatment exhibited higher activity (48.4 %) and the C2=-C3= selectivity (31.0 %). Characterizations showed that decorating the hydroxyl group boosted the formation of Fe5C2 and CHx species, promoting the chain growth for long -chain olefin, whereas the alkyl group modification retarded the activity decline through stabilizing active FeCx phases and forming graphite carbon which was conducive to suppressing secondary hydrogenation.
更多查看译文
关键词
Fe/ZnO hydroxyl group,Alkyl group,CO2 hydrogenation,Olefin
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要