Pd Catalysts Supported on Zr-Based Materials Used in Lean-Burn Natural Gas Exhaust Combustion
Article Abstract: A series of Zr-based supports such as ZrO2, Y0.1Zr0.9Ox, Ce0.1Zr0.9Ox, and Al0.1Zr0.9Ox were prepared by a co-precipitation method. The physicochemical properties of the supports were characterized by N2 adsorption-desorption （the Brunauer-Emmet-Teller method） and X-ray powder diffraction. The Pd-based catalysts were prepared with Pd supported on these supports by the impregnation method. The Pd dispersion on the catalyst surface was characterized by CO chemisorption. The activity of the Pd-based catalysts in a simulated mixture gas from lean-burn natural gas vehicles with and without SO2 was tested. The results indicated that ZrO2 modified by Y^3＋, Ce^4＋, or Al^3＋ improved the resistance of the catalysts to sulphur poisoning. The modification of Pd/ZrO2 with Y^3＋ or Al^3＋ led to more active than the Pd/ZrO2 catalyst no matter with or without SO2 in the simulated gas.
About Author:
Author: LONG Enyan, WANG Yun, ZHANG Xiaoyu, LI Yile, GONG Maochu, CHEN YaoqiangPublisher: Key Laboratory of Green Chemistry and Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
Keywords:palladium, zirconia, supported catalyst, leanburn natural gas, methane conversion, sulphur poisoning
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