Title: Effects of particle size and metal-support interactions on Fischer-Tropsch synthesis over Ru catalysts
Abstract: The methanation activities (A/sub m/) were measured in a 3:1:6 H/sub 2//CO/He mixture at 523/sup 0/-673/sup 0/K and 1 or 10 atm over 0.7-11% Ru/Al/sub 2/O/sub 3/ catalysts prepared by adsorbing Ru/sub 3/(CO)/sub 12/, H/sub 4/Ru/sub 4/(CO)/sub 12/, or Ru/sub 6/C(CO)/sub 17/ cluster complexes from pentane solutions or impregnating aqueous RuCl/sub 3/ on alumina support. A/sub m/ consistently decreased with increasing Ru dispersion of the catalysts, when the latter was characterized by the ratio of chemisorbed CO to H/sub 2/ (R), rather than by H/sub 2/ chemisorption. The distribution of C/sub 2/ plus hydrocarbons and the C/sub 2/ plus/C/sub 1/ ratio of the product were nearly identical for all the catalysts, but the olefin/paraffin ratio increased with increasing R. Apparently, chain growth is little affected by the size of Ru particles. A/sub m/ is probably limited by the availability of chemisorbed hydrogen, which is also critical for paraffin formation. The metal-support interactiton, which increases with increasing Ru dispersion, as shown in IR studies of CO adsorption, may be responsible for the observed differences in catalyst activity and product composition.
Publication Year: 1979
Publication Date: 1979-01-01
Language: en
Type: article
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