Mechanism of the Products Formation in the Vapor Phase Ammoxidation Reaction of 4-Phenyl-o-Xylene

• 作者: Dilgam B. Tagiyev Gulu A. Bagirzade Manaf R. Manafov
• 来源期刊: 化学工程与科学期刊(英文)
• 学科: 化学
• 关键词: AMMONOLYSIS 4-Phenyl-o-Xylene KINETICS MECHANISM
• 年，卷（期）: 2015,（4）
• 页码范围: 430-440
• 页数: 11页
• 分类号: O6

摘要

On the basis of kinetic data of 4-phenyl-o-xylene and 4-phenyl-o-tolunitrile ammoxidation, formation mechanism of the products was analyzed and generalized. It has been shown that dissociative adsorption of a substrate and mononitrile occurs on the centers with high heats of adsorption of oxygen and as a consequence, completely covered with it, competitive adsorption of NH3 and O2 occurs on the centers with low heats of adsorption of the latter;mononitrile and dinitrile are formed correspondingly from adsorbed fragments of both substrate and NH3, and tolunitrile and NH3;surface interaction of adsorbed fragments of substrate and O2 with low heat of adsorption gives imide and CO2;hydrolysis of dinitrile into imide occurs on centers completely covered with ammonia;imide decarboxylation occurs on the centers covered with it;oxidative destruction of tolunitrile occurs on centers covered with substrate and mononitrile.