STUDY THE CATALYTIC EFFICIENCY OF THE TRANSITION METAL OXIDE SURFACES

Abstract

The present work is concerned with metal oxide catalysts especially nickel and cobalt oxides, which are among the most important technological materials being used in the manufacture of chemicals, fuels, foods, pharmaceuticals and material; such as organic polymer. However, the current work concentrates on study of the catalytic efficiency of metal oxide surfaces, using the decomposition of hydrogen peroxide as a model reaction. The kinetic study of the catalytic decomposition reaction was one of the objectives of the present investigation. Studying the effect of each oxide on the catalytic activity of the other was also a part of the aim of the present investigation.

i The present work lies on four chapters, the introduction, the ' experimental, the results and the discussion and the general discussion.

The first one comprises a literature survey on the published work in the field of metal oxide catalysts and concentrates on the nickel and cobalt oxides, which are the subject of our investigation.

The second one deals with the experimental part. It describes the preparation of the catalyst by co-precipitation method as oxalate and study the calcination effect on the obtained oxides at different calcination temperatures 400, 600, 800°C. Different techniques were used such as X­ ray diffraction, thermal analysis (DTA, TGA) and Infra-red spectra to characterize the obtained catalysts. The kinetic parameters were also measured. The decomposition ofH202 was studied in aqueous medium at different reaction temperatures in presence ofnickel and cobalt oxides. •