Hydrogenation of Benzene over Rhodium-Copper Alloy Crystallites Supported on Alumina

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题名:	Hydrogenation of Benzene over Rhodium-Copper Alloy Crystallites Supported on Alumina
作者:	Lu, Chun-Mei;Wang, Ikai;Chou, Shu-Ching;Yeh, Chuin-Tih
贡献者:	化學工程系 Department of Chemical Engineering
关键词:	Rhodium;Copper;Bimetallic catalysts;Hydrogenation
日期:	2001-12
上传时间:	2008-12-12 11:52:37 (UTC+8)
出版者:	勤益科技大學
摘要:	Supported bimetallic Rh ?Cu/Al2O3 catalysts of different copper fractions (Xcu = Ncu/(Ncu + NRh) atomic ratios) were prepared by impregnating a monometallic 3.8 wt.%Rh/Al2O3 catalyst with copper. Benzene hydrogenation over the prepared catalysts was studied with a fixed bed reactor using a 1x10 5 Pa gaseous stream of 10% benzene in hydrogen. In a reaction-temperature range between 373 and 423 K, the observed reaction order varied significantly with their alloy phase on the surface of dispersed metallic crystallites. A rhodium-rich phase dominated the surface of bimetallic catalysts at low Xcu (< 0.3) and exhibited a higher activity than the mono-metallic rhodium. On increasing the copper fraction of bimetallic catalysts to Xcu > 0.5, the activity decreased dramatically because the surface of dispersed bimetallic crystallites was covered by a copper-rich phase.
關聯:	勤益學報 No.19 p.119-131
显示于类别:	[勤益科技大學] 勤益學報

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