Abstract
It has been found that the major role of zeolites in the Fischer-Tropsch synthesis on composite Co catalysts is to reduce the average molecular weight of hydrocarbons produced from CO and H2 on acid sites. Secondary transformations of hydrocarbons on zeolites presumably proceed by the carbocation mechanism. The total composition of the synthesis products depends on the properties of zeolite and on the interposition of active sites of the zeolite and cobalt. It is shown that in many cases the introduction of a zeolite in the H form into cobalt catalysts of the Fischer – Tropsch synthesis increases productivity and selectivity toward the synthetic oil and reduces the selectivity toward methane.
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