Abstract
Metal-support interactions in inverse catalysts prepared by adsorbing tetraethoxysilane (TEOS) on to Co3O4 can be manipulated by varying the solvent mixture, from which TEOS is taken up. Deposition of TEOS on Co3O4 nanoparticles in n-hexane results in the formation of silica oligomers after calcination at 573 K interacting strongly with cobalt(II,III)oxide. Modification of Co3O4 nanoparticles with TEOS in a hydrolysing environment results in a stronger interaction due to the formation of surface cobalt silicate formed through hydrolysis. The presence of surface silicates results in a strong increase in the turnover frequency of carbon monoxide consumption in the Fischer-Tropsch synthesis operating at close to industrial conditions. The obtained activity change is accompanied with a shift to a more paraffinic product.
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