Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1065 - 1070 (1982)
Update date:2022-08-11
Topics:
Nenadovic, Milica T.
Micic, Olga I.
Adzic, Radoslav R.
The electron transfer reactions from methyl viologen monocation radicals to colloidal platinum hydrosols were studied using the pulse-radiolysis technique.Besides the reduction of water, hydrogenation of methyl viologen on platinum also takes place in these reactions.Evolution of hydrogen is enhanced at higher temperatures (65 deg C) and reduction of MV(1+) is hindered.The reaction shows complex behaviour in the presence of hydrogen because of the formation of reduction products which decrease the catalytic activity of platinum.The reaction rate decreases from 1.3E3 s-1 in an argon-saturated solution to 0.6 s-1 in a hydrogen-saturatted solution in the presence of 2.5E-5 mol dm3 Pt hydrosols.
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