CHROMIA CHROMINUM PHOSPHATES AS SOLID ACID CATALYSTS

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Title:	CHROMIA CHROMINUM PHOSPHATES AS SOLID ACID CATALYSTS
Authors:	CHEN,YW;LI,CP
Contributors:	化學工程與材料工程學系
Keywords:	ALUMINUM;DECOMPOSITION
Date:	1992
Issue Date:	2010-06-29 17:35:12 (UTC+8)
Publisher:	中央大學
Abstract:	A series of chromia-chrominum phosphate catalysts with various P/Cr ratios were prepared with the coprecipitation method. The surface acidic properties of these catalysts were examined by temperature-programmed desorption (TPD) of ammonia and the dehydration reaction of isopropanol. The dehydration reaction was carried out in a continuous-flow microreactor at 220-degrees-C under atmospheric pressure. The results of TPD of ammonia indicated that the surface acidity of chromia-chrominum phosphate is medium strong. The acidic strengths are approximately the same for all the samples. However, the acid concentration is increased with increasing the P/Cr ratio of the catalyst. The dehydration activity of the catalyst is also increased with increasing the P/Cr ratio of the sample. The results indicated that the addition of phosphorus on chromia, even in a small amount, could significantly enhance the acidities of the catalysts. In addition, the acid amount of mixed oxide is decreased in the order: iron oxide-iron phosphate > chromia-chrominum phosphate > alumina-aluminum phosphate.
Relation:	CATALYSIS LETTERS
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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