Reactions of colloidal platinum in aqueous solutions containing methyl viologen, its cation radical, and hydrogen, studied by pulse radiolysis

Marek Brandeis, Gad S. Nahor, Joseph Rabani*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The reactions of methyl viologen ions, MV2+ and MV+, and molecular hydrogen in the presence of colloidal Pt were investigated by pulse radiolysis. In the pH range 1.5-4 all the reducing species in the system were converted into molecular hydrogen. At pH 10, practically all the reducing species produced MV+, while in the intermediate pH range (6-8) the predominant species were Pt particles loaded with hydrogen in the form of hydride ions. The kinetics of reactions of the Pt colloidal particles with MV+ and H2 were investigated. The rate of reaction of MV+ with the Pt was first order in MV+ and second order in Pt. When the reaction of MV2+ with loaded Pt was also important, the overall order with respect to Pt was less than 2. A loading mechanism involving particle-particle collisions is examined in relation to the effects of pH, [Pt], and repetitive pulses.

Original languageEnglish
Pages (from-to)1615-1623
Number of pages9
JournalJournal of Physical Chemistry
Volume88
Issue number8
DOIs
StatePublished - 1984

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