Abstract
The synthesis, analytical examination and activity of ultrafine particle, iron carbide catalysts synthesized by laser pyrolysis of gaseous Fe(CO) 5 in C 2H 4 are described in relation to their application for the dissolution of coal under hydroliquefaction conditions. These catalysts, containing mixed carbide, metal and oxide phases or pure carbide phases with crystallite sizes between 5–20 nm, are converted under excess sulfur conditions to pyrrhotite during the dissolution of subbituminous and bituminous coals. Besides the iron carbide Fe 3C, which has been previously reported as a product of the laser pyrolysis of Fe(CO) 5, it is shown that the seldom studied carbide Fe 7C 3, can be easily synthesized. The conditions under which various phases of the ultrafine carbide particles can be synthesized are presented. Analyses by surface and bulk techniques for as-prepared, and thermally treated or sulfided catalysts are discussed in relation to previously published data on iron carbide catalysts.
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