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- W28973608 abstract "Various types of catalysts have been used for coal liquefaction. Among these catalysts, molybdenum and iron catalysts are most frequently used and they are usually combined with other metal oxides. Molybdenum catalysts, in the form of Co/Mo/Al/sub 2/O/sub 3/ wherein this notation represents some form of the metal oxides and the last species is the support, have been used in the H-Coal process. In others, iron catalysts have been used in the form of red mud which is mixed with elemental sufur. The activity of iron catalysts has generally been regarded as low when compared with that of molybdenum catalysts. However, iron oxide catalysts became highly active for the conversion of coal-related model compounds when used in the presence of H/sub 2/S and H/sub 2/. For coal liquefaction in the absence of a heterogeneous catalysts, the use of a mixture of H/sub 2/S and H/sub 2/ instead of H/sub 2/ resulted in an increase in conversion. Because of the interaction of H/sub 2/S with Fe/sub 2/O/sub 3/ and the fact that iron is presently the lowest cost transition metal, iron was selected as the basis metal for a new set of heterogeneous catalysts specifically designed for coal liquefaction using themore » H/sub 2/S-H/sub 2/ reducing gas medium. The catalysts were subjected to two reactions: hydrocracking of diphenylmethane to toluene and benzene, a model compound for the Ar-C bond cleavage of the coal structure, and hydrocracking of diphenyl ether to phenol and benzene, a model compound for the Ar-O bond cleavage of the coal structure. The reaction conditions for these reactions are summarized in Table 2. 4 references, 2 tables.« less" @default.
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- W28973608 date "1984-01-01" @default.
- W28973608 modified "2023-09-27" @default.
- W28973608 title "New iron oxide catalyst reduction activities with hydrogen sulfide and hydrogen" @default.
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