Low temperature activation of industrial cobalt–zeolite catalysts for Fischer–Tropsch synthesis

The effect of temperature (325, 350, 380, 400, 410, 425, 450, 475°C) and activation (reduction) time (1, 2, 4, 6 hours) on the content and degree of reduction of metallic cobalt in an industrial granulated Fischer–Tropsch synthesis catalyst was studied. It was shown that a decrease in the reduction temperature can be compensated for by increasing the heat treatment time in a hydrogen flow, thereby achieving similar values of metallic cobalt in the catalyst. For example, for catalysts reduced at 325°C for 6 hours and 400°C for 1 hour, the degree of cobalt reduction was 14% and 21%, respectively. Key catalytic performance indicators (CO conversion, C₅₊ hydrocarbon productivity, and selectivity for CH₄ and C₅₊ hydrocarbons) from fixed-bed tests of these catalysts are presented. Long-term testing (up to 650 hours) demonstrated that a lower catalyst reduction temperature leads to more stable catalyst bed operation.

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