燐酸カドミウム触媒: その物理化学的性質と活性度について

Abstract

Density and surface area of cadmium phosphate catalyst, prepared from cadmium nitrate and sodium orthophosphate, were measured. The hydrogen adsorption by this cadmium phosphate becomes active from about 150°. Its activated adsorption began with comparatively rapid, initial adsorption followed by gradual adsorption. It was found that, in decomposition of isopropyl alcohol, dehydrogenation is chiefly effected and dehydration occurs in a slight degree at above 350°. Compared to cadmium oxide, the direction of decomposition is the same but the temperature at which activity appears is lower and the degree of activity is greater. Relationship between partial pressure and initial reaction velocity of isopropyl alcohol was examined using 4.5g. of this catalyst, at a reaction temperature of 250°, contact time 100-300min./mole, and benzene as the diluent, and it was found that the initial reaction velocity, at above partial pressure of 0.6, became approximately constant and namely the order of the reaction is nearly zero. Piperidine is dehydrogenated to pyridine by passage over this catalyst at 400°, 425°, or 450°, and the yield of pyridine was 32% of the piperidine used, at 450°.