Effect of the Supports on the Properties of Supported Oxychlorination Catalysts.

The relation between the specific surface, porosity and chemical nature of various supports and the stability of methane oxychlorination catalysts prepared on the basis of these supports was investigated. The adsorption characteristics of the supports and the corresponding catalysts were determined, and the nature of the distribution of the active salt mass on the catalyst surface was established. A study of the sorption of the reaction components on these supports and catalysts led to the conclusion that the support is inert with respect to the active salt mass. Using the adsorption method, a study was made of the reaction between a catalytic salt melt and the support surface. Supports with a small surface have minimum stability, while those with a developed surface have maximum stability. On the basis of the data obtained, a support with a specific surface of the order of 10-20 m**2/g and a pore diameter of 50-200 A is recommended.