Title: Fate of iron and ruthenium complexes deposited in Faujasite-type zeolites
Abstract: The tests were conducted with Fe/sub 3/(CO)/sub 12/ and Ru/sub 3/(CO)/sub 12/ supported on sodium and hydrogen Y zeolites. Under vacuum, the supported iron clusters evolved all carbon monoxide at 50/sup 0/-200/sup 0/C and the ruthenium clusters evolved three carbonyl groups per Ru/sub 3/ cluster below 200/sup 0/C and the other nine ligands at 320/sup 0/-430/sup 0/C. The activity of the untreated supported clusters for the reaction of carbon monoxide and hydrogen to Fischer-Tropsch products in a batch reactor at room temperature and 20 bar was low. The iron and ruthenium catalysts thermally decomposed 200/sup 0/ and 250/sup 0/C, respectively, were active at those temperatures and yielded hydrocarbons in linearly decreasing amounts with increasing chain length to C/sub 9/. Larger iron particles on the outer surfaces of Y zeolites catalyzed the formation of larger amounts of hydrocarbons with more than six carbon atoms, up to C/sub 12/. The results showed that the iron and ruthenium clusters are inactive for the Fischer-Tropsch synthesis if reaction conditions favor their stability within the zeolite cavities, but are good precursors for the formation of small metallic aggregates catalyzing a chain-limited selective formation of hydrocarbons.
Publication Year: 1980
Publication Date: 1980-01-01
Language: en
Type: article
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