1394
KEN-ICHI TANAKA AND GEORGE BLYHOLDER
Photocatalytic Reactions on Zinc Oxide. 111. The Hydrogenation of Ethylene
by Ken-ichi Tanaka*I and George Blyholder Department of Chemistry, University of Arkansas, Fayetteville, Arkansas 72701
(Received September 22, 1971)
Publication costs borne completely by The Journal of Physical Chemistry
The hydrogenation of ethylene taking place over zinc oxide was studied both under dark and illuminated conditions. The reaction rate and the adsorption were simultaneously measured during reaction. No photoeffects were observed on catalytic activity, adsorption of ethylene, or kinetics. The reaction rate is expressed by an equation, r = ~PH,'/~[C~HI],, where [CzHd], is adsorbed ethylene, which is changed by the addition of propylene. The reactivity sequence of olefins on ZnO is CzH4 >> CaHe, and the relative adsorption strength on ZnO is CzHl
