低碳化学与化工2025，Vol.50Issue(3)：39-46,8.DOI:10.12434/j.issn.2097-2547.20240298
Ni/Al2O3-CeO2催化剂上乙烷干重整反应本征动力学研究
Study on intrinsic kinetics of ethane dry reforming reaction on Ni/Al2O3-CeO2 catalysts
摘要
Abstract
Ethane dry reforming is one of the important ways to realize CO2 utilization.Ni-based catalysts are widely used in ethane dry reforming reactions due to their characteristics of low costs and high catalytic activities.However,the mechanism of ethane dry reforming is still unclear,which restricts the development of high-efficienct Ni-based catalysts.Using the sol-gel method,Ni-based catalysts with nickel mass fractions of 5％and 10％(5％Ni/Al2O3-CeO2 and 10％Ni/Al2O3-CeO2),respectively,were prepared.The effects of the reactants partial pressures(pC2H6and pCO2)and the products partial pressures(pH and pCO)on the related reactions were analyzed by intrinsic kinetic method.The influences of reaction temperatures and Ni clusters average particle sizes on the activation of ethane during ethane dry reforming were studied.The results show that at temperature of 823 K,atmospheric pressure,pC2H6 of 0.1 kPa to 0.7 kPa,pCO2 of 2.0 kPa to 20.0 kPa and space velocity of 6.9 x 105 mL/(g·h),the forward rate of ethane conversion increases linearly with pC2H6 while independent with pCO2,pH2 and pCO over the catalysts.In the intrinsic kinetic interval,the rate-controlled step of the ethane dry reforming reaction rate is ethane activation,and the activation energy is(108±10)kJ/mol.At temperature of 823 K,atmospheric pressure and space velocity of 6.9 x 105 mL/(g·h),5％Ni/Al2O3-CeO2 with Ni clusters average particle sizes of 6.5 nm exhibits relative high ethane activation rate,which is(7.26±0.80)mol/(mol min·kPa).关键词
乙烷干重整反应/Ni/Al2O3-CeO2催化剂/本征动力学/反应机理Key words
ethane dry reforming reaction/Ni/Al2O3-CeO2 catalysts/intrinsic kinetics/reaction mechanism分类
化学工程引用本文复制引用
郭冰洋,杜春丽,范志辉,杨旭港,张艺,闫龙飞,张振洲,涂维峰..Ni/Al2O3-CeO2催化剂上乙烷干重整反应本征动力学研究[J].低碳化学与化工,2025,50(3):39-46,8.基金项目
国家自然科学基金面上项目(22278379) （22278379）
河南省科技研发计划联合基金(222301420010). （222301420010）
