Preparation of heterogeneous catalysts based on CWAO technology

Abstract

Refractory-biodegradable organic wastewater can be effectively treated by catalytic wet oxidation (CWAO). The preparation of non-catalyst is the core of CWAO technology. The preparation methods of heterogeneous catalysts include precipitation method, impregnation method, precipitation impregnation method, sol-gel method and chemical deposition method. According to the different ways of adding metal solution and precipitant, the precipitation method is divided into positive addition method, reverse addition method and combined addition method. According to the impregnation amount, the impregnation method can be divided into equal amount and excessive impregnation method. According to the principle of chemical reaction engineering, heterogeneous CWAO reaction process can be divided into 7 processes, such as internal diffusion and external diffusion. CWAO method is expected to be applied and expanded in pesticide, printing and dyeing, papermaking and other industries.