摘要
通过等体积浸渍法制备单贵金属Pt/γ-Al2O3和双金属Pt-Ce/γ-Al2O3催化剂,考察Ce对催化剂活性的影响,确定催化剂最优配比。结果表明,当Pt的负载量为质量分数0.5%时,Pt/γ-Al2O3催化活性最高;当Pt的负载量为质量分数0.2%,Ce的负载量为质量分数1.0%时,Pt-Ce/γ-Al2O3催化剂的催化活性最高。Pt-Ce/γ-Al2O3催化剂的甲苯转化率高于Pt/γ-Al2O3催化剂。随着Pt负载量增大,催化剂孔容、孔径减小。粉体式催化剂性能优于整体式催化剂,但差别不大;Ce的添加有助于催化剂活性的提升。
A Pd/γ-Al2O3 catalyst and a Pd-Ce/γ-Al2O3 catalyst were prepared by equal volume impregnation method,the effect of Ce doping on the catalytic oxidation of toluene was investigated,and the optimum loading of the active component Pt was discussed.The results showed that the Pt/γ-Al2O3 catalyst had the highest catalytic activity when the loading mass fraction of Pt was 0.5%.When the loading mass fraction of Pt was 0.2% and the loading mass fraction of Ce was 1.0%,Pt-Ce/γ-Al2O3 catalyst had the highest catalytic activity.The conversion of toluene over Pt-Ce/γ-Al2O3 catalyst was higher than that of Pt/γ-Al2O3 catalyst.The pore volume and pore diameter increased with the increasing of the Pt loading.The catalytic performance of powder catalysts was better than that of monolithic catalysts,but the difference was not significant.The addition of Ce contributed to the improvement of the catalytic activity.
作者
梁文俊
王昭艺
任思达
Liang Wenjun;Wang Zhaoyi;Ren Sida(Key Laboratory of Beijing on Regional Air Pollution Control,Beijing University of Technology,Beijing 100124,China)
出处
《工业催化》
CAS
2019年第11期25-29,共5页
Industrial Catalysis
基金
国家重点研发计划(2016YFC0204300)资助项目
关键词
催化剂工程
贵金属
甲苯
CEO2
催化氧化
catalyst engineering
noble metal
toluene
CeO2
catalytic combustion