Title: Alumina-supported tungsten- and molybdenum-triosmium clusters as carbon monoxide hydrogenation catalysts
Abstract: Catalysts prepared by impregnating ..gamma..-Al/sub 2/O/sub 3/ with (C/sub 5/H/sub 5/)MOs/sub 3/(CO)/sub 12/H(MOs/sub 3/), where M is W or Mo, or with Os/sub 3/(CO)/sub 12/ and activated in hydrogen by heating the samples to 500/sup 0/C at 1/sup 0/ or 10/sup 0/C/min showed very similar activities and selectivities for the hydrogenation of carbon monoxide to methane in a 3:1 H/sub 2//CO mixture at 350/sup 0/-400/sup 0/C and 1 atm. Separate experiments showed almost no activity for alumina-supported (C/sub 5/H/sub 5/)/sub 2/W/sub 2/(CO)/sub 6/. Apparently, the activation of the bimetallic clusters caused their fragmentation, leaving only Os atoms as the active sites. With all the catalysts, the products contained over 80% methane, up to 10% ethane after 1 min of exposure, and approx. 4% each ethane and ethylene and up to 4% carbon dioxide after 20 min. CO conversion to methane dropped rapidly in the first few minutes and then declined at a slower but constant rate, probably because of catalyst carbonization. The activation rates for the W/Os and Mo/Os catalysts activated at 1/sup 0/C/min were 32 and 34 kcal/mole, respectively.
Publication Year: 1980
Publication Date: 1980-01-01
Language: en
Type: article
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