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Adsorbed Hydrogens and Reduction of Olefins on Platinum in Acid Solution
Author(s) -
Kita Hideaki
Publication year - 1979
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.197900019
Subject(s) - chemistry , platinum , hydrogen , adsorption , olefin fiber , inorganic chemistry , anode , catalysis , electrode , organic chemistry
Abstract Platinum electrodes subjected to anodic activation reveal three kinds of adsorbed hydrogen (I, II, and III). These adsorbed hydrogens are interchangeable with each other. The adsorbed hydrogen I (ionization peak at ca. 40 mV, rhe) is the most reactive and responsible for the hydrogen evolution reaction. When C 2 –C 4 olefins are reduced by H 2 , the adsorption layer on Pt drastically changes depending on the composition of olefin and H 2 in the gas phase. At relatively low pressure of H 2 (region H), II (ca. 140 mV) takes part in the hydrogenation, whereas III (ca. 290 mV) gradually changes to II. Isotopic study proves that the hydrogenation in region H proceeds by the two Horiuti‐Polanyi type reaction paths, which is common among the olefins studied. The electroreduction gave the same results, where the discharge of H + is always taken to be in equilibrium.

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