Influência dos métodos de preparação de catalizadores Zn0/Cu0 na desidrogenação catalítica do Isopropanol.

Abstract

The binary Zn0/Cu0 system has been reported in the literature as a very good catalyst for the synthesis anddecomposition of methanol, particularly at a composition of 70:30::Zn0:Cu0. It was, therefore, decided to study the influence of the methods of preparation on the activities of these catalysts. The objectives of the present work were the followings: - preparation of Zn0/Cu0 Catalysts with chemical Compositions identical and equal to 70:30::Zn0:Cu0 , using methods: co-precipitation of copper and zinc hydroxides, precipitation of Cu(OH)2 on Zn0, sol vent evaporation of copper and zinc nitrate solution, and mechanical mixing of copper and zinc oxides. - performation of different thermal treatments and calcinations at different temperatures. - evaluation of the catalytic activities of the pre pared and thermally treated catalysts, using the decomposition of isopropanol as a model reaction , at constant space-velocity and pressure, and - determination of the influence of reaction tempera ture on the activities of the catalysts. It was observed that all the prepared catalysts have been selective for the reaction of isopropanol dehydrogena tion. The activities of the catalysts are influenced notably by the reaction temperature and that the better results of isopropanol conversion have been obtained by the catalysts prepared by evaporation of solvent method.