化工进展2024，Vol.43Issue(4)：1840-1850,11.DOI:10.16085/j.issn.1000-6613.2023-0571
Ni/Sm2O3-CeO2/Al2O3催化剂氧空位对二氧化碳低温甲烷化的影响
Effect of oxygen vacancies in Ni/Sm2O3-CeO2/Al2O3 catalyst on CO2 methanation at low temperature
摘要
Abstract
Ni/Sm2O3-CeO2/Al2O3 and Ni/MnOx-Sm2O3-CeO2/Al2O3 catalysts were obtained by using Mn,Sm and Ce sources in the form of LDHs precursor by hydrothermal synthesis after a standard calcination and reduction treatment.Subsequently,the catalytic performance of the two catalysts were investigated at low temperature in CO2 methanation.Compared to Ni/Sm2O3-CeO2/Al2O3,Ni/MnOx-Sm2O3-CeO2/Al2O3 with the introduction of MnOx showed an excellent performance below 225℃,with 68％of CO2 conversion and 100％of CH4 selectivity,and 0.087s-1 of TOF,which was higher than that of Ni/Sm2O3-CeO2/Al2O3(0.013s-1).Meanwhile,Ni/MnOx-Sm2O3-CeO2/Al2O3 maintained stable CO2 conversion and CH4 selectivity in long-term test for 100h.This was mainly due to the fact that the introduction of M nO increased the oxygen vacancies on Ni/MnOx-Sm2O3-CeO2/Al2O3 with a high degree of Ni particle dispersion.Meanwhile,MnOx could also increase the basic sites of the resultant catalyst,which promoted CO2adsorption and activation.In situ DRIFTS analysis further revealed that oxygen vacancies on Ni/MnOx-Sm2O3-CeO2/Al2O3 promoted the formation of formate and methoxy intermediates at low temperatures,leading to an enhanced catalytic properties in CO2 methanation.关键词
二氧化碳/加氢/甲烷/催化剂/催化(作用)Key words
carbon dioxide/hydrogenation/methane/catalyst/catalysis分类
化学化工引用本文复制引用
郭潇东,毛玉娇,刘相洋,邱丽,于峰,闫晓亮..Ni/Sm2O3-CeO2/Al2O3催化剂氧空位对二氧化碳低温甲烷化的影响[J].化工进展,2024,43(4):1840-1850,11.基金项目
国家自然科学基金(22108189,21878203). （22108189,21878203）
