Benzyl phenyl ether, n-octylbenzene and dibenzyl were reacted to examine the catalytic ability of three different synthetic pyrites with the lapse of time after production. The reaction was carried out in a 50ml autoclave, into which sample 1g, decalin 5g as solvent, 350mg catalyst and initial hydrogen pressure 10MPa were charged. The autoclave was held at 450 or 475℃ of reaction temperature for 1h. In the reaction of benzyl phenyl ether the conversion was 100% at any condition with and without the catalyst. R-34 catalyst did not show effective results. In the case of 9501 catalyst, benzene and toluene were produced with somewhat higher yield and condensed products decreased. Moreover, no benzylphenol was produced. The addition of sulfur to R-34 catalyst did not improve the ability. n-Octylbenzene showed relatively lower conversion at any condition (18-24%). In the reaction with R-34 catalyst the yield of toluene increased and that of C_2-benzene decreased. In the reaction with 9401 catalyst C_8-benzene (not n-octylbenzene) increased. In the reaction with 9501 catalyst C_8-benzene decreased, and toluene and benzene increased. The newer catalyst has somewhat the activity of splitting bond between aromatic carbon and aliphatic one as well as hydrogenation of aromatic ring.
