The reduction of sulfuric acid by hydrogen on various metal-carbon catalysts.

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概要

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• The reduction of sulfuric acid, which is formed on the activated carbon catalyst in the course of removing sulfur dioxide from exhaust gas, was investigated. The platinum, palladium, silver, and copper on activated carbon were found to be catalytically active in the reduction of sulfuric acid by hydrogen, while manganese, iron, cobalt, nickel, and zinc were found to be inactive. The copper–carbon catalyst is favorable, because sulfuric acid was reduced selectively to sulfur dioxide on it at temperatures from 190 °C to 270 °C. On the platinum–carbon catalyst, the reduction occurred at a relatively low temperature (140 °C to 200 °C), but hydrogen sulfide and elemental sulfur were formed in addition to sulfur dioxide. It is concluded from thermodynamic calculations that catalytically active metals were in the metallic state on activated carbon under the present reaction conditions. An electrochemical mechanism is proposed for the reaction.

• 公益社団法人 日本化学会の論文

著者

• Katagiri Akira

  Department Of Applied Chemistry School Of Engineering Nagoya Univercsity

• Watanabe Kiyoshi

  Department of Chemistry, College of Liberal Arts and Sciences, Kyoto University

• Yoshizawa Shiro

  Department of Industrial Chemistry, Faculty of Engineering, Kyoto University

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