Carbon monoxide hydrogenation over various titania-supported Ru-Ni bimetallic catalysts

摘要

A series of titania-supported ruthenium-nickel bimetallic catalysts,with total metal loading of approx4.5 wt.% in each,was prepared and characterized for various physico-chemical properties.The hydrogenation of carbon monoxide was studied over these catalysts in the temperature range of 483-493 K,weight hourly space velocity of 1.5 h~(-1),H_2/CO mole ratio of 2,and at atmospheric pressure.The effects of ruthenium loading and pretreatment procedures on the hydrogenation activities of these catalysts and product selectivities were studied.The catalyst containing 3.6 wt.% Ni and 0.82 wt.% Ru produced highest proportion of C_5_+ hydrocarbons (60 wt.%).High olefin selectivities (40 wt.% for C_2~= and 93 wt.% for C_3~=,respectively) were observed with catalysts containing only ruthenium (5 wt.%).The effect of metal-metal interaction in the bimetallic catalysts on product selectivities was also studied.