TY - JOUR
T1 - Reactions of colloidal platinum in aqueous solutions containing methyl viologen, its cation radical, and hydrogen, studied by pulse radiolysis
AU - Brandeis, Marek
AU - Nahor, Gad S.
AU - Rabani, Joseph
PY - 1984
Y1 - 1984
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0141917131&partnerID=8YFLogxK
U2 - 10.1021/j150652a035
DO - 10.1021/j150652a035
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0141917131
SN - 0022-3654
VL - 88
SP - 1615
EP - 1623
JO - Journal of Physical Chemistry
JF - Journal of Physical Chemistry
IS - 8
ER -