Direct synthesis of hydrogen peroxide from hydrogen and oxygen over palladium catalyst supported on H 3PW 12O 40-incorporated MCF silica

Abstract

Palladium catalysts supported on H 3PW 12O 40 heteropolyacid incorporated into MCF silica (Pd/HPW-MCF- X ( X = 1.0, 4.8, 9.1, 13.0, 16.7, 20.0, 23.1, and 25.9)) were prepared with a variation of H 3PW 12O 40 content ( X, wt.%). The prepared catalysts were then applied to the direct synthesis of hydrogen peroxide from hydrogen and oxygen. Conversion of hydrogen over Pd/HPW-MCF- X catalysts showed no great difference, while selectivity for hydrogen peroxide and yield for hydrogen peroxide over the catalysts showed volcano-shaped curves with respect to H 3PW 12O 40 content. Acidity of Pd/HPW-MCF- X catalysts also showed a volcano-shaped trend with respect to H 3PW 12O 40 content. It was observed that yield for hydrogen peroxide increased with increasing acidity of Pd/HPW-MCF- X catalyst. Thus, acidity of Pd/HPW-MCF- X catalyst played an important role in determining the catalytic performance in the direct synthesis of hydrogen peroxide. HPW-MCF- X support efficiently served as an alternate acid source in the direct synthesis of hydrogen peroxide.