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Deactivation of Pd/C catalyst often occurs in liquid hydrogenation using industrial materials. For in-stance, the Pd/C catalyst is deactivated severely in the hydrogenation of N-(3-nitro-4-methoxyphenyl) acetamide. In this study, the chemisorption of sulfur on the surface of deactivated Pd/C was detected by energy dispersive spec-trometer and X-ray photoelectron spectroscopy. Sulfur compounds poison the Pd/C catalyst and increase the forma-tion of azo deposit, reducing the activity of catalyst. We report a mild method to regenerate the Pd/C catalyst: wash the deposit by N,N-dimethylformamide and oxidize the chemisorbed sulfur by hot air. The regenerated Pd/C cata-lyst can be reused at least ten runs with stable activity.
Deactivation of Pd / C catalyst often occurs in liquid hydrogenation using industrial materials. For in-stance, the Pd / C catalyst is deactivated severely in the hydrogenation of N- (3-nitro-4-methoxyphenyl) acetamide. chemisorption of sulfur on the surface of activated Pd / C was detected by energy dispersive spec-trometer and X-ray photoelectron spectroscopy. Sulfur compounds poison the Pd / C catalyst and increase the formations of azo deposit, reducing the activity of catalyst. We report a mild method to regenerate the Pd / C catalyst: wash the deposit by N, N-dimethylformamide and oxidize the chemisorbed sulfur by hot air. The regenerated Pd / C cata-lyst can be reused at least ten runs with stable activity.