A highly selective catalyst of Co/La4Ga2O9 for CO2 hydrogenation to ethanol

• 作者: Kang An Siran Zhang Jiaming Wang Qiang Liu Ziyang Zhang Yuan Liu
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（5）
• 页码范围: 486-495
• 页数: 10页
• 语种: 英文

摘要

A new catalyst of Co/La4Ga2O9 for CO2 hydrogenation to produce ethanol was prepared by reducing LaCo0.5Ga0.5O3,which showed excellent selectivity to ethanol (≈35C-mol％) at mild reaction conditions (270 ℃,3.5 MPa,3000 mL g-1 h-1).The catalysts were characterized by N2 adsorption/desorption,XRD,XAFS,CO and CO2-TPD,H2 chemisorption,XPS and TEM techniques.The interaction between Co nanoparticles (NPs) and La4Ga2O9 oxide resulted in Co0-Co2+ on the surface of Co NPs.It was proposed that La4Ga2O9 could catalyze reverse water gas shift reaction (r-WGS),which converted CO2 to CO.Then,the CO migrated to Co0-Co2+ on Co NPs,where it was hydrogenated to form ethanol like higher alcohols synthesis from syngas.The results suggest that by controlling the oxidation state of cobalt,and combined with a kind of active site for activating CO2 to form CO,a catalyst with excellent selectivity to ethanol could be obtained for CO2 hydrogenation,which means that the complex reaction may be proceed with high selectivity using only one active metal component.