Effect of BaO on catalytic performance of Pd-based catalysts for purification of gasoline-methanol exhaust

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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