Abstract
Methods for preparing bimodal alumina supports and molybdena/alumina catalysts by extrusion techniques were examined. The methods used to produce bimodal pore structure in the extrudates were (1) partial peptization, (2) coextrusion of salt/boehmite mixtures, and (3) incorporation of combustible fiber such as Avicel or filter pulp. The study was limited to Conoco's Catapal SB alumina. The effects of solid content of the mixture, pH of the peptizing solution, and degree of mixing on the consistency of the extrusion mixture and the pore size distribution of the resulting extrudates were examined. The type of cellulose fiber and its loading was found to affect the nature of the macropores produced in the extrudates. The extrudates were thermally treated to develop mesopores in the range needed for coal liquefaction catalysts (80–180 Å with an average pore diameter of 120 Å).
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