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Title: Carbon-13 kinetic isotope effects in CO oxidation by Ag

Abstract

In the catalytic oxidation of carbon monoxide over silver wool the {sup 13}C kinetic isotope effects in the 343--453 K temperature range were experimentally determined and the following temperature dependence was found: 100 ln(k{sub 12}/k{sub 13}) = (3.398--630/T) {+-} 0.083. A reaction CO/O{sub 2}gas mixture of 1:2 ratio was used in a static system with initial pressures ranging from 20 to 40 kPa. Under these conditions the reaction is of order 1 with respect to CO and order 0 with respect to O{sub 2} and CO{sub 2} pressure. The apparent activation energy is 59.3 {+-} 1.7 kJ/mol. In the authors theoretical interpretation of the experimental data various geometries of (CO{sub 2})* and (CO{sub 3})* transition states were applied, and only a (CO{sub 2})* with an interbond angle of 110{degree} and CO stretching force constants of 1,700 and 1,000--1,400 N/m, respectively, with an asymmetric reaction coordinate was found to be acceptable.

Authors:
; ; ;
Publication Date:
Research Org.:
J. Stefan Inst., Ljubljana (SI)
OSTI Identifier:
20000522
Report Number(s):
CONF-9808111-
Journal ID: ISSN 0743-7463; LANGD5; TRN: US0000072
Resource Type:
Journal Article
Journal Name:
Langmuir
Additional Journal Information:
Journal Volume: 15; Journal Issue: 18; Conference: Third international symposium on effects of surface heterogeneity in adsorption and catalysis on solids, Torun (PL), 08/09/1998--08/16/1998; Other Information: PBD: 31 Aug 1999; Journal ID: ISSN 0743-7463
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 40 CHEMISTRY; CARBON MONOXIDE; OXIDATION; SILVER; CATALYTIC EFFECTS; ISOTOPE EFFECTS; CARBON 13; ACTIVATION ENERGY

Citation Formats

Kobal, I., Burghaus, U., Senegacnik, M., and Ogrinc, N. Carbon-13 kinetic isotope effects in CO oxidation by Ag. United States: N. p., 1999. Web. doi:10.1021/la981309n.
Kobal, I., Burghaus, U., Senegacnik, M., & Ogrinc, N. Carbon-13 kinetic isotope effects in CO oxidation by Ag. United States. doi:10.1021/la981309n.
Kobal, I., Burghaus, U., Senegacnik, M., and Ogrinc, N. Tue . "Carbon-13 kinetic isotope effects in CO oxidation by Ag". United States. doi:10.1021/la981309n.
@article{osti_20000522,
title = {Carbon-13 kinetic isotope effects in CO oxidation by Ag},
author = {Kobal, I. and Burghaus, U. and Senegacnik, M. and Ogrinc, N.},
abstractNote = {In the catalytic oxidation of carbon monoxide over silver wool the {sup 13}C kinetic isotope effects in the 343--453 K temperature range were experimentally determined and the following temperature dependence was found: 100 ln(k{sub 12}/k{sub 13}) = (3.398--630/T) {+-} 0.083. A reaction CO/O{sub 2}gas mixture of 1:2 ratio was used in a static system with initial pressures ranging from 20 to 40 kPa. Under these conditions the reaction is of order 1 with respect to CO and order 0 with respect to O{sub 2} and CO{sub 2} pressure. The apparent activation energy is 59.3 {+-} 1.7 kJ/mol. In the authors theoretical interpretation of the experimental data various geometries of (CO{sub 2})* and (CO{sub 3})* transition states were applied, and only a (CO{sub 2})* with an interbond angle of 110{degree} and CO stretching force constants of 1,700 and 1,000--1,400 N/m, respectively, with an asymmetric reaction coordinate was found to be acceptable.},
doi = {10.1021/la981309n},
journal = {Langmuir},
issn = {0743-7463},
number = 18,
volume = 15,
place = {United States},
year = {1999},
month = {8}
}