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- W1567228608 abstract "Publisher Summary Three United States low-rank coals are investigated at 250–450° C using tetralin and a molybdenum sulfide catalyst. Donor solvent provides high conversions and prevents retrogressive reactions throughout the temperature range investigated. Catalytic hydrogenation provides better product quality at low temperatures but is not effective at preventing retrogressive reactions at high temperatures. Up to 400°C, the donor solvent and catalyst are equally effective for providing high conversion. At 450°C, catalytic hydrogenation in the absence of donor solvent is not as effective as donor solvent reaction in the absence of catalyst. The temperature gas-phase hydrogen (H2) is not sufficient, even in the presence of catalyst, to prevent retrogressive reactions. Solvents have two major effects on noncatalytic liquefaction of low-rank coals: dissolution of coal-derived radicals to reduce their local concentration and prevent recombination and participation in the chemical depolymerization of the coal. Below 350°C, physical solvation appears to be more important than the chemical nature of the solvent. Catalysis by ammonium tetrathiomolybdate (ATTM) is clearly beneficial in enhancing conversion. At 400° C, nearly comparable conversions are obtained from either ATTM without a donor solvent or tetralin with no catalyst. At 450° C, the donor solvent is vital in preventing retrogressive reactions. The highest conversions and highest oil are obtained at 450° C for reactions with both ATTM and tetralin." @default.
- W1567228608 created "2016-06-24" @default.
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- W1567228608 date "1995-01-01" @default.
- W1567228608 modified "2023-09-27" @default.
- W1567228608 title "Comparative roles of hydrogen gas and solvent in liquefaction of low-rank coals" @default.
- W1567228608 cites W1965267577 @default.
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- W1567228608 doi "https://doi.org/10.1016/s0167-9449(06)80027-3" @default.
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