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- W2000264129 abstract "Two coals (one subbituminous and one bituminous) have been hydrogenated without solvent under different experimental conditions. Tests without a catalyst were performed at 300, 350, and 400 °C with a hydrogen pressure of 5 or 10 MPa. Two Fe-catalyst precursors (FeSO4 and red mud) were tested at 10 MPa of H2 and increasing the temperature range up to 500 °C in the case of the bituminous coal. The results indicate that mainly at 400 °C and 5 MPa of H2 important repolymerization reactions take place in the subbituminous coal, generating a large macropore volume in the solid residues. In Fe-catalyzed processes, and independently of the catalytic precursor, 425 °C seems to be a critical temperature. At lower temperatures, the hydrogenation reaction is predominant and the residues show increasing open porosity, at higher temperatures and mainly at 500 °C, the repolymerization processes are predominant, obtaining lower conversion and less porous residues. The repolymerization reactions bring about a blockage of porosity in all pore ranges." @default.
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- W2000264129 date "1996-01-01" @default.
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- W2000264129 title "Textural Changes in Coals during Hydrogenation" @default.
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- W2000264129 doi "https://doi.org/10.1021/la960168r" @default.
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