酸化カドミウム触媒, その製法による活性度の相違について

Abstract

Aqueous solution of ammonium carbonate, sodium carbonate, ammonia water, or sodium hydroxide was added to the aqueous solution of cadmium nitrate (tetrahydrate) and cadmium carbonate or hydroxide so formed was submitted to pyrolysis. With the four kinds of cadmium oxide (CdO (I), (II), (III), (IV)) thereby obtained, bulk density, surface area, and reduction velocity with hydrogen were examined, and the oxide was used as a catalyst in the catalytic vapor-phase decomposition of isopropyl alcohol. It was thereby found that CdO (I), obtained by the pyrolysis of cadmium carbonate prepared with ammonium carbonate as the precipitation agent, had the largest surface area, was the most active in reduction with hydrogen, and dehydrogenation of the alcohol was the most efficient. On the other hand, CdO (IV), obtained by pyrolysis of cadmium hydroxide prepared with sodium hydroxide as the precipitation agent, had the smallest surface area, was consequently most inactive in reduction with hydrogen, and dehydrogenation ability of the alcohol was the smallest.