Effect of BaO on catalytic performance of Pd-based catalysts for purification of gasoline-methanol exhaust
来源期刊：Journal of Rare Earths2014年第7期
论文作者：张雪乔 赵明 徐成华 汪嘉扬 陈耀强
文章页码：603 - 609
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.
张雪乔1，赵明2，徐成华1，汪嘉扬1，陈耀强1
1. College of Resources and Environment, Chengdu University of Information Technology2. Institute of Catalytic Material Science, Sichuan University
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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