1995 Volume 21 Issue 6 Pages 961-971
Hydrogenation of benzene and carbon dioxide was carried out over catalysts prepared from amorphous alloys containing zirconium. The hydrogenation activity of the alloys was very low in the virgin state, but the activity gradually increased in the order of oxidation, reduction in a hydrogen atmosphere and hydrogenation. Characterization of the amorphous alloys revealed that the increase in surface area caused by oxidation of zirconium was responsible for the increase in catalytic activity. When the alloys were oxidized in an oxygen atmosphere, the active metal atoms for hydrogenation and zirconium in the alloys were simultaneously oxidized. When the oxidized alloys were treated in a hydrogen atmosphere, palladium, platinum and nickel oxides were reduced to the respecture metal atoms, whereas zirconium oxide remained. As a result, palladium, platinum or nickel catalysts supported on zirconium oxide were prepared from the amorphous alloys.
The principal advantage of a catalyst prepared from an amorphous alloy was high dispersion of active metal on the surface, despite the high content of metal.
Amorphous alloys containing zirconium are considered to be an attractive catalyst precursor for hydrogenation.