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首页> 美国政府科技报告 >Pyrolysis and hydropyrolysis of diphenylmethane and sulphur-containing compounds immobilised on silica
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Pyrolysis and hydropyrolysis of diphenylmethane and sulphur-containing compounds immobilised on silica

机译：固定在二氧化硅上的二苯甲烷和含硫化合物的热解和加氢热解

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The use of high pressures and dispersed catalysts, such as sulphided molybdenum (Mo) in fixed-bed hydropyrolysis of coals give rise to increased tar yields. In order to improve our understanding of these phenomena, Particularly in relation to cleavage of C-C and C-S bonds, experiments have been conducted on samples of silica-immobilised benzene, diphenylmethane, thioanisole and dibenzothiophene (DBT). These model substrates have the inherent advantage that they do not soften and thus stay in the reactor. Moreover, for the surface-immobilized benzene, the SiO-C bond linking the substrate to the surface is reasonably stable and does not show significant cleavage until 550(degrees)C (peak maximum) with a high yield of benzene being achieved at 150 bar hydrogen pressure. For the diphenylmethane substrate, the use of 150 bar hydrogen pressure and the Mo catalyst both reduced the peak evolution temperatures for benzene and toluene clearly demonstrating their separate contributions to promoting C-C bond cleavage. Desulphurisation of the DBT substrate occurred only in hydrogen and the thermal decomposition of the thioanisole substrate was altered markedly by the Mo catalyst.

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