Abstract
A Pd sheet electrode was chemically palladinized with active hydrogen passing through it. The Pd black deposits grew up three‐dimensionally with increasing palladinization time, causing the marked increase in reaction zone or number of reaction site for the hydrogenation. The rate of 4‐ethyltoluene production (v) in the hydrogenation of 4‐methylstyrene at the palladinized Pd sheet electrodes increased over 40 times larger than that at the Pd sheet electrode without palladinization. In addition, the reciprocal of the v value linearly depended on the reciprocal of surface roughness factor, supporting the idea that the rate‐determining step changed from the hydrogenation to the supply of the active hydrogen together with the increase in surface roughness factor of the palladinized Pd sheet electrode.
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