Catalytic Activity of Zirconium Phosphate for Dehydration of 2-Propanol

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Abstract
Catalytic activity tests were carried out by a flow system-over thg"zirco-nu.m phospl ate catThs"tl which wa's prepared from ZrO(NO3)2 and NaHPO4. Acidity, DTA TGA curve low frequency infrared spectrum and xrray pattern of catalyst samples were measured to characterize the catalyst structure. The conversion data of the reaction were arranged in the integral form of the zero-order kinetics and the apparent activation energy of the reaction was nearly equal to 22kcal/mol at low temperatures ranging from 170 to 230C and 9.1kcal/mol at high temperature above 230C. The catalytic activity and the acidity of catalyst showed a rough linier relationship and both of them exhibited the maximum values at about 400C in the calcination temperature ranging from 200 to 1000C. Lewis-type acid sites, formed by the removal of water from zirconium phosphate having a hydrate sturucture, would be a cause od an acidic property and an origin of catalytic activity. The zirconium phosphate, showed a similar characteristic to alumina in catalysis, was not effective for the reactions such as polymerization of propylene or dealkylation of cumene.

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