Sulfur Poisoning of Palladium-based Catalysts Using Cerium Oxide

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  • 酸化セリウムを使用したパラジウム系触媒の硫黄被毒現象の表面反応解析

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Description

The SO2 poisoning phenomenon of supported palladium catalyst using ceria as oxygen storage materials was studied. Their surface states were measured before and after poisoning and examined sulfur desorption behavior. The desorption temperature of the sulfur adsorbed on Pd/CeO2 was higher than that of Pd/Al2O3 in reduced condition, and gave an influence on regeneration. We suggest this was caused by the interaction between reduced palladium and ceria based on reducibility of ceria from an analysis of the sulfur quantity and chemical states change of catalyst. Also we studied the effect of a tmosphere on the SO2 poisoning of Pd/CeO2 at the fixed temperature. As a result, at 573 K adsorbed SO2 would interfere the oxygen storage ability of Pd/CeO2 in o xidizing condition and deactivate the surf ace of palladium in reducing condition.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1998 (10), 697-703, 1998-10-10

    The Chemical Society of Japan

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