アセチレンとその誘導體に關する硏究(第8報) : 氣相法によるアセチレンよりアセタルデハイドの合成に關する硏究(その2)

Abstract

It was determined that the yellow crystal cadmium chromate, the best catalyst for this subject in the previous report, had the constitution CdCrO4･2H2O. By means of the chemical and X-ray analysis as well as the thermal balance measuring of thig crystal and its pyrolyzed substances, it was found that the crystal lost its crystalline water below 300℃, and remained under the same state of black CdCrO4 below 500℃, until finally decomposed to CdO, Cr2O3 and O2 below 700℃. On the other hand, dehydration curves of various carriers were obtained by means of the thermal balanc which proved that the acid clay kept the zeolitic water, supposed to be suitable for this reaction, for the longest period. From these two points of view, the distinctive characteristics of the cadmium chromate-acid clay catalyst are discussed.