THE NATURE OF HYDROGEN INTERACTION WITH OXIDE COPPER-CONTAINING CATALYSTS .1. THE STATE OF COPPER CHROMITE AND ITS CATALYTIC ACTIVITY IN THE CONVERSION OF ACETONE TO ISOPROPANOL

The influence of the temperature of the catalyst pretreatment in H-2 b oth on the state and on the catalytic activity of copper chromite in a cetone hydrogenation to isopropanol was studied. It was shown that red uction in H-2 at 180 - 370 degrees C permitted one to achieve the most active state of the catalyst. The reduction of similar to 50% of copp er ions took place in this temperature region, and the metal copper wa s stabilized on the surface of a defect spinel in the form of bonded e pitaxial particles. This state was reversible, and the hydrogen remova l resulted in the restoration of the parent chromite.