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Conversions of hydrocarbons on rhenium-palladium-aluminosilicate catalysts under reforming conditions☆

1964; Elsevier BV; Volume: 3; Issue: 1 Linguagem: Inglês

10.1016/0031-6458(64)90085-1

1879-3010

M. A. Ryashentseva, Yu. A. Afanas'eva, Х. М. Миначев,

Catalysts for Methane Reforming

IN PREVIOUS papers [1,2] the catalytic properties of rhenium-aluminiumpalladium catalysts have been studied on the basis of the conversions of cyclohexane, methylcyclopentane, n-hexane, and methylcyclohexane, and their mixtures. We showed that a rhenium-aluminium-pal]adium-catalyst treated with hydrogen sulphide possesses good isomerizing, dehydrogenating, and dehydroisomerizing properties: from n-hexane, cyclohexane, methylcyclopentane, and methylcyclohexane are formed, respectively, 52 % of isohexanes, 87 and 61.2% of benzene, and 90~ of toluene. In the present work, on the basis of the conversion of hydrocarbons (cyclohexane, metbylcyc]opentane, and n-hexane) at 480 °, a pressure of 10 arm a space velocity of feed of 1.0 hr -1, and an H~ : HC ratio of 5, rhenium-palladium-aluminosilicate catalysts differing in the method of treatment (HF and H2S ) and in the specific surface of the support have been investigated. It has been found that a 1% Pd-1% Re-A1203.SiO 2 catalyst with a specific surface (S) of the support of 350 m2/g, treated with hydrogen sulphide, possesses the greatest dehydrogenating activity (59 % of benzene from cyclohexane) and isomerizing activity (41-2°/o of isohexane from n-hexane). The introduction of hydrofluoric acid into this catalyst leads to the enhancement of its dehydroisomerizing and hydrocracking properties. When the specific surface of the aluminosilieate decreases, the dehydrogenating and hydrocracking properties of the catalyst diminish, while its isomerizing function remains almost unchanged.