Synthesis and study of massive molybdenum carbides and supported carbide containing catalyst composition Мо2С/С, obtained by mechanical activation

The methods the first time are developed for the synthesis of solid molybdenum carbide by mechanical activation in air of mixture MoO3, carbon and Zn; for synthesis of supported carbide containing catalyst Mo2C/C composition by the method of mechanical activation in an inert atmosphere of carbon impregnated with 16 % aqueous solution of ammonium paramolybdate. The metal content, particle size, surface area, phase composition are determined for mechanically activated compositions using a complex of physical and chemical methods. Structure of carbide containing supported catalyst was studied by electron microscopy, catalyst’s acidic properties were studied by temperature-programmed desorption of ammonia and the catalytic test were carried out in model reactions of hydrodesulfurization of dibenzothiophene (DBT) and aromatization of alkanes. It is shown that the catalyst composition Mo2C/C exhibits a high activity in these reactions: conversion of DBT at contact time 3–6 hours is 80–85 %; conversion of n- heptane at a contact time of 2 hours is 31,2 %, and the reaction product is 100% toluene. Increasing the contact time to 6 hours reduces the conversion of n-heptane and 1,3 % , wherein in the reaction product contains up to 47 % of С6–С7 cycloalkane. The results show a high catalytic activity of Mo2C/C, obtained by mechanical activation.

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