Studies on the Catalysts for Coal Liquefaction. Specific Behavior of Various Catalysts in the Hydrogenolysis of Model Compounds (Additive Effect of Tetralin).

Six kinds of model compounds were subjected to catalytic hyd-rogenolysis in tetralin as a hydrogen-donor solvent at 653K. Ten kinds of catalysts were employed and the additive effect of tetralin on the reaction profiles was discussed. Three kinds of model compounds that scarcely reacted at 653K were subjected to hydrogenolysis at 693K, and the temperature effect was discussed. The additive effect of tetralin was clas-sified into four categories as follows: (1) tetralin increases the overall conversion, (2) tetra-lin decreases the overall conversion, (3) the overall conversion is not varried obviously but the composition of products is changed by an addition of tetralin, (4) neither the overall conversion nor the compositionof products is varied by an addition of tetralin. Thus, the effect of tetralin added was specific for the individual reaction system. The increase in reaction temperature accelerates the reactions which were retarded on addition of tetralin, but it seemed that the conversions were still lower than those for the reactions at 653 K without addition of tetralin.