INFLUENCE OF CHLORINE CONTENT ON PROPERTIES OF MULTIMETAL REFORMING CATALYST

This article examines the effects of chlorine on samples of a KR-108 multimetal catalyst containing 0.3%, 0.5%, and 1% chlorine. The samples were washed with an aqueous ammonia solution and the tests were performed in a pilot unit operating under pressure with the recirculation of hydrogen-rich gas. The strong influence of the chlorine content in the catalyst in the aromatization reactions is indicated. The results indicate that an increase of the chlorine content in the catalyst up to 0.9-1% led to an increase in reforming selectivity. An increase of the chlorine content in the catalyst gives a considerable increase of the aromatization of paraffinic hydrocarbons in the reforming process, with the rate of the aromatization reaction increasing more rapidly than the rates of hydrocracking reactions, so that the process selectivity is increased. It is concluded that in catalytic reformers using chlorine-promoted multimetal catalysts, conditions must be strictly observed so as to ensure a constant content of chlorine in the catalyst (0.8-1% by weight).