石油化工高等学校学报2025，Vol.38Issue(4)：66-74,9.DOI:10.12422/j.issn.1006-396X.2025.04.009
制备方法对La2O2CO3/ZnO催化乙醇脱氢性能的影响
The Influence of Preparation Methods on the Catalytic Performance of La2O2CO3/ZnO in Ethanol Dehydrogenation
摘要
Abstract
For the reaction of catalytic dehydrogenation of ethanol to produce acetaldehyde,current catalysts face the challenge of limited selectivity,particularly exhibiting poor performance in the efficient generation of acetaldehyde.Some catalysts are hindered in the dehydrogenation process due to excessive acidity,which urgently needs to be addressed.Therefore,the development of novel catalysts with high-performance surface basicity is crucial.Two composite catalysts,La2O2CO3/ZnO-a and La2O2CO3/ZnO-b,were prepared using the co-precipitation method and the solution combustion method.The performance of the catalysts was evaluated by varying preparation conditions such as precipitation pH,aging time,calcination temperature,and calcination time to determine the optimal synthesis parameters.Advanced characterization techniques,including Scanning Electron Microscopy,Transmission Electron Microscopy,X-ray Diffraction,and CO2 Temperature-Programmed Desorption,were employed to thoroughly investigate the catalyst's crystal phase,morphology,surface basicity,and their relationship with catalytic performance.The optimal process conditions for ethanol dehydrogenation to acetaldehyde were investigated on the best-performing catalyst.When the precipitation pH was 9.0,the aging time was 12.0 h,the ratio of nLa to nZn was 1.0,and the calcination temperature was 600℃,the optimal preparation conditions for the solution calcination method were determined as follows:calcination time of 5.0 h,calcination temperature of 550℃,and nLa/nZn of 1.0.Under the conditions of a volume space velocity of 1.0 h⁻¹,a reaction pressure of 1.0 MPa,and a reaction temperature of 190℃,La₂O₂CO₃/ZnO-a achieved the highest acetaldehyde yield of 57.60%.关键词
乙醇脱氢制乙醛/共沉淀法/溶液燃烧法/La2O2CO3/ZnOKey words
Ethanol dehydrogenation to acetaldehyde/Coprecipitation method/Solution combustion method/La2O2CO3/ZnO分类
化学化工引用本文复制引用
屈鑫茹,薄德臣,耿忠兴,白国玉,刘冬梅..制备方法对La2O2CO3/ZnO催化乙醇脱氢性能的影响[J].石油化工高等学校学报,2025,38(4):66-74,9.基金项目
辽宁省教育厅基本科研业务费项目(青年项目)(LJKQZ20222298). （青年项目）
