低碳化学与化工2024，Vol.49Issue(12)：19-26,8.DOI:10.12434/j.issn.2097-2547.20240125
载体对Fe基催化剂CO2催化加氢制低碳烯烃性能的影响
Effects of supports on catalytic performances of Fe-based catalysts for CO2 hydrogenation to light olefins
摘要
Abstract
The selection of suitable support is crucial for the rational design of novel and efficient Fe-based catalysts for CO2 hydrogenation to light olefins(ethylene,propylene and butene).Supports were synthesized by hydrothermal method,and impregnated with K and Fe to prepare a series of Fe-based catalysts(K-Fe/ZrO2,K-Fe/ZnO,K-Fe/TiO2 and K-Fe/Al2O3).The effects of these supports on the catalytic performance of CO2 hydrogenation were investigated.The catalysts were characterized by XRD,N2 absorption/desorption,Raman,CO-TPD,CO2-TPD,in suit Raman and water droplet contact angle tests,and the induction effects of supports on the generation of Fe active species were studied.The results show that under reaction conditions of temperature of 320℃,pressure of 2.0 MPa,feed gas V(CO2):V(H2):V(Ar)=1:3:3 and gas hourly space velocity of 10000 mL/(g·h),K-Fe/ZrO2 exhibites superior selectivity of light olefins(42.4%)and CO2 conversion rate(36.2%).Compared to other catalysts,K-Fe/ZrO2 has a suitable adsorption capacity for CO and CO2,which is beneficial for CO2 activation and carbon deposition.It also inhibits the secondary hydrogenation of olefins while obtaining more FexCy active species.Additionally,K-Fe/ZrO2 exhibites strong hydrophobicity due to carbon deposition during the reaction process,further reducing the degree of water oxidation of FexCy and improving the selectivity of light olefins.关键词
CO2加氢/低碳烯烃/载体/动态演变/Fe基催化剂Key words
CO2 hydrogenation/light olefins/support/dynamic evolution/Fe-based catalysts分类
化学化工引用本文复制引用
李广辉,张艳艳,王萌,高健,张振洲,孙绍晖..载体对Fe基催化剂CO2催化加氢制低碳烯烃性能的影响[J].低碳化学与化工,2024,49(12):19-26,8.基金项目
国家自然科学基金青年项目(22208314) （22208314）
科技部"十三五"国家重点研发计划子课题(2018YFB060450402). （2018YFB060450402）
