| abstract |
PCT No. PCT/JP97/03196 Sec. 371 Date Apr. 15, 1999 Sec. 102(e) Date Apr. 15, 1999 PCT Filed Sep. 11, 1997 PCT Pub. No. WO98/10863 PCT Pub. Date Mar. 19, 1998A palladium-base catalyst can selectively hydrogenate highly unsaturated hydrocarbon compounds contained in small amounts in an olefin compound prepared by steam cracking or the like of naphtha without causing hydrogenation of the olefin as a side reaction and the precipitation of a carbonaceous material. The catalyst comprises palladium and alumina, and the exposed face of each palladium crystallite is mainly accounted for by (100) and (110) faces. Further, in the desorption of absorbed hydrogen by heating, desorption peaks are observed in the temperature ranges of 40 to 90 DEG C. and of 120 to 170 DEG C. and the ratio of hydrogen desorption amount of the former to the latter is (4:6) to (3:7). |