EFFECT OF CHROMIUM PROMOTER ON COPPER-CATALYSTS IN ETHANOL DEHYDROGENATION

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Title:	EFFECT OF CHROMIUM PROMOTER ON COPPER-CATALYSTS IN ETHANOL DEHYDROGENATION
Authors:	TU,YJ;LI,CP;CHEN,YW
Contributors:	化學工程與材料工程學系
Keywords:	METHYL FORMATE;METHANOL
Date:	1994
Issue Date:	2010-06-29 17:33:43 (UTC+8)
Publisher:	中央大學
Abstract:	A series of chromium-promoted copper catalysts with various Cr to Cu molar ratios were prepared with the co-precipitation method. The promotional effects of chromium on copper catalysts were examined by X-ray powder diffraction (XRD), nitrous oxide decomposition, and the dehydrogenation reaction of ethanol. The dehydrogenation reaction was carried out in a continuous-flow microreactor between 523 and 583 K under atmospheric pressure. The results indicated that the promotional effect was dependent on the Cr/Cu molar ratio, and the predominant decay of catalysts in this study was caused by sintering. The catalyst with the Cr/Cu molar ratio of 4/40 has the highest activity and stability. The surrounded well-dispersed chromia strongly influenced the catalytic properties of copper metal. It also showed that the over-promotion of a catalyst has a disastrous effect on the total make of product. The ethanol dehydrogenation reaction follows a first-order reaction, and the kinetics for deactivation can be described by a second-order expression.
Relation:	JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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