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Title: Pulse radiolysis study to probe reduced platinum colloids in aqueous solution using optical and conductivity techniques

Abstract

Measurements of conductance changes accompanying the pulse radiolysis of aqueous solutions containing 2-propanol, methylviologen (MV/sup 2 +/), and colloidal Pt (Ptc) have been carried out in parallel with optical absorption measurements on the same systems in order to investigate the reactions involved in the loading of Ptc with reducing equivalents. Two stages could be distinguished in the equilibration of MV/sup +/, MV/sup 2 +/, H/sup +/, H/sub 2/, and Ptc. The faster process, which was over in about 6 ms, is attributed to the equilibrium involving MV/sup +/, MV/sup 2 +/, and H/sup +/ with Ptc while the slower process which takes approx. 100 ms or more, is suggested to involve H/sub 2/ produced by radiolysis. At pH values in the range 9-11, the conductivity signal was found to decay more slowly and to a smaller extent than the optical absorption. Thus the injection of charge into the catalyst particle is faster than the protonation of the charged catalyst. The number of protons absorbed per electron increases with time to a value of about 0.7. Optical experiments at near-neutral pH suggested the adsorption of MV/sup 2 +/ on the catalyst to be important.

Authors:
; ;
Publication Date:
Research Org.:
Hebrew Univ., Jerusalem (Israel)
OSTI Identifier:
7004208
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem.; (United States)
Additional Journal Information:
Journal Volume: 92:8
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BIPYRIDINES; ABSORPTIVITY; ELECTRIC CONDUCTIVITY; RADIOLYSIS; PLATINUM; PROPANOLS; AQUEOUS SOLUTIONS; COLLOIDS; EXPERIMENTAL DATA; PULSE TECHNIQUES; ALCOHOLS; AZINES; CHEMICAL RADIATION EFFECTS; CHEMICAL REACTIONS; CHEMISTRY; DATA; DECOMPOSITION; DISPERSIONS; ELECTRICAL PROPERTIES; ELEMENTS; HETEROCYCLIC COMPOUNDS; HYDROXY COMPOUNDS; INFORMATION; METALS; MIXTURES; NUMERICAL DATA; OPTICAL PROPERTIES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PHYSICAL PROPERTIES; PLATINUM METALS; PYRIDINES; RADIATION CHEMISTRY; RADIATION EFFECTS; SOLUTIONS; TRANSITION ELEMENTS; 400600* - Radiation Chemistry; 400500 - Photochemistry

Citation Formats

Rabani, J, Fessenden, R W, and Sassoon, R E. Pulse radiolysis study to probe reduced platinum colloids in aqueous solution using optical and conductivity techniques. United States: N. p., 1988. Web. doi:10.1021/j100319a055.
Rabani, J, Fessenden, R W, & Sassoon, R E. Pulse radiolysis study to probe reduced platinum colloids in aqueous solution using optical and conductivity techniques. United States. https://doi.org/10.1021/j100319a055
Rabani, J, Fessenden, R W, and Sassoon, R E. 1988. "Pulse radiolysis study to probe reduced platinum colloids in aqueous solution using optical and conductivity techniques". United States. https://doi.org/10.1021/j100319a055.
@article{osti_7004208,
title = {Pulse radiolysis study to probe reduced platinum colloids in aqueous solution using optical and conductivity techniques},
author = {Rabani, J and Fessenden, R W and Sassoon, R E},
abstractNote = {Measurements of conductance changes accompanying the pulse radiolysis of aqueous solutions containing 2-propanol, methylviologen (MV/sup 2 +/), and colloidal Pt (Ptc) have been carried out in parallel with optical absorption measurements on the same systems in order to investigate the reactions involved in the loading of Ptc with reducing equivalents. Two stages could be distinguished in the equilibration of MV/sup +/, MV/sup 2 +/, H/sup +/, H/sub 2/, and Ptc. The faster process, which was over in about 6 ms, is attributed to the equilibrium involving MV/sup +/, MV/sup 2 +/, and H/sup +/ with Ptc while the slower process which takes approx. 100 ms or more, is suggested to involve H/sub 2/ produced by radiolysis. At pH values in the range 9-11, the conductivity signal was found to decay more slowly and to a smaller extent than the optical absorption. Thus the injection of charge into the catalyst particle is faster than the protonation of the charged catalyst. The number of protons absorbed per electron increases with time to a value of about 0.7. Optical experiments at near-neutral pH suggested the adsorption of MV/sup 2 +/ on the catalyst to be important.},
doi = {10.1021/j100319a055},
url = {https://www.osti.gov/biblio/7004208}, journal = {J. Phys. Chem.; (United States)},
number = ,
volume = 92:8,
place = {United States},
year = {Thu Apr 21 00:00:00 EDT 1988},
month = {Thu Apr 21 00:00:00 EDT 1988}
}