54.遷移金属触媒による種々芳香族化合物の水素化転換反応に及ぼす硫化水素の影響

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Hydroconversion of aromatic hydrocarbons was carried out with transition metal catalysts such as metallic iron fine powder, iron oxides, iron sulfates, iron sulfide, stabilized metallic nickel, supported ruthenium, rhodium and palladium on carbon in the absence and presence of H_2S under initial H_2 pressure of 10MPa at 350℃. In the case of the absence of H_2S, the activity of transition metal catalysts was affected with the form of the precursor used, and the reaction was proceeded mainly romatic-rings hydrogenation and the reaction products were constituted of many the corresponding hydrogenated compounds. The catalytic activities for hydrogenation were decreased by H_2S addition to the reaction system, but new active sites for bridged C_<ar>-C_<alk> bond scission between naphthalene-ring carbon C_<ar> and methylene carbon C_<alk> in naphthylmethylbibenzyl and dinaphthylmethanes molecules were formed. The C_<ar>-C_<alk> bond breaking of 1-position in dinaphthylmethane molecules was easier than the C_<ar>-C_<alk> breaking of 2-position of naphthalene-ring. The rate of C-C bond scission to the rate of hydrogenation was depended on the kind of metal and the partial pressure of H_2S.
2000-09-28