CO and C3H8 Total Oxidation over Pd Catalysts Supported on Commercial Ce-Zr Solid Solution: Effects of the Calcination Temperature and Hydrothermal Treatment

doi:10.1007/s40242-015-4326-9

Abstract

Abstract:

A series of Pd catalysts supported on commercial Ce-Zr solid solution(Pd/CZ) calcined at different temperatures(750, 900 and 1050 ℃) was prepared via an incipient wetness impregnation method. The activities of the fresh and hydrothermally aged Pd/CZ catalysts were tested for total oxidation of CO and C₃H₈. For CO oxidation, the activity of either fresh or aged Pd/CZ catalysts decreased with the elevating of calcination temperature of CZ support, with a fresh catalyst calcined at 750 ℃ possessing the highest activity and hydrothermal stability. For C₃H₈ total oxidation, the activity of Pd/CZ catalysts could be improved by increasing the calcination temperature of support. However, the aged Pd/CZ catalysts showed higher activity than corresponding fresh Pd/CZ catalysts. The turnover frequency(TOF) over Pd/CZ catalyst for CO oxidation increased with increasing reduction ability of the catalysts, with a fresh catalyst calcined at 750 ℃ having the highest value(0.27 s^-1). However, the TOF of Pd/CZ catalyst for C₃H₈ total oxidation was mainly affected by the size of Pd particles, and large Pd particles possessed a higher activity, with the highest TOF value(0.96 s^-1) obtained over an aged catalyst calcined at 1050 ℃.

Key words: Pd/Ce-Zr catalyst, Stability, Turnover frequency, Hydrothermal aging

ZHOU Renmei, ZHANG Xuanyu, LU Jiqing, HU Gengshen, LUO Mengfei. CO and C₃H₈ Total Oxidation over Pd Catalysts Supported on Commercial Ce-Zr Solid Solution: Effects of the Calcination Temperature and Hydrothermal Treatment[J]. Chemical Research in Chinese Universities, 2015, 31(2): 288-293.

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CO and C₃H₈ Total Oxidation over Pd Catalysts Supported on Commercial Ce-Zr Solid Solution: Effects of the Calcination Temperature and Hydrothermal Treatment

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