Zirconia supported nickel and cobalt-nickel bimetallic catalysts were prepared and characterized for various physico-chemical properties. The hydrogenation of carbon monoxide was studied over these catalysts in the pressure range of 101.3-1654 kPa, temperature range of 513-533 K, weight hourly space velocity range of 8-14 h À1 and H2/CO mole ratio of 2. Catalysts containing both Co and Ni were found to give higher C 5þ hydrocarbons selectivity compared to that containing only Ni. A maximum C 5þ hydrocarbons selectivity of 55 wt% was obtained at 655 kPa pressure, 523 K and 9.6 h À1 of WHSV with catalyst containing 4.03 wt% Co and 2.64 wt% Ni. The C 2 and C 3 olefin contents of the products decreased with increase in pressure. Improved deactivation behavior of the catalysts was observed when operated at high pressure.
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