催化作用
X射线光电子能谱
甲醇
钯
无机化学
化学
氧化还原
吸附
选择性催化还原
钡
氧化物
材料科学
化学工程
有机化学
工程类
作者
Xueqiao Zhang,Ming Zhao,Chenghua Xu,Jiayang Wang,Yaoqiang Chen
标识
DOI:10.1016/s1002-0721(14)60115-0
摘要
Barium oxide was developed successfully to modify palladium catalysts supported on CeO2-ZrO2-La2O3-Al2O3 (CZLA) compound oxides by impregnation method. N2 adsorption (BET), X-ray diffraction (XRD), H2-temperature-programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the influence of BaO on the physicochemical properties of catalyst. And catalytic activity tests for methanol, CO, C3H8 and NO conversion were evaluated. Catalytic activity results showed that BaO had a positive effect on the conversion of all pollutants. H2-TPR results suggested that the addition of BaO increased the reductive ability of the palladium catalysts. The XPS results indicated that doping BaO also improved the dispersion of Pd species and increased the amounts of Ce3+ on the Pd-Ba/CZLA catalyst surface, which led to a better redox property. The excellent redox property helped to improve the catalytic activities toward all the pollutants over Pd-based catalysts.
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