Abstract: The unsteady and steady-state kinetics of low-temperature CO oxidation over Pd supported on TiO2, SiO2, and Al2O3were investigated by using pulse/flow microcatalytic installation.In situFourier-transformed IR spectroscopy was used to monitor Pd surface under reaction conditions. The kinetic parameters were found to differ considerably from those typical for the high-temperature region. Room-temperature CO oxidation was demonstrated to be structure-sensitive and to proceed via interaction between weakly bound CO and oxygen located at defect centers. Analysis by a semiempirical interacting bonds method showed weakly bound forms of CO to appear due to cooperative Pd–Pd bond rearrangement induced by CO adsorption/desorption processes, while oxygen incorporation into the subsurface layer hinders this reconstruction, thus strengthening Pd–CO bond. In the range of 298–373 K, transition to a mechanism of the usual Langmuir–Hinshelwood type occurs, affecting observed kinetic features of the reaction.

Cite: Pavlova S.N. , Sadykov V.A. , Bulgakov N.N. , Bredikhin M.N.
The Influence of Support on the Low-Temperature Activity of Pd in the Reaction of CO Oxidation: 3. Kinetics and Mechanism of the Reaction
Journal of Catalysis. 1996. V.161. N2. P.517-523. DOI: 10.1006/jcat.1996.0213 WOS Scopus РИНЦ ANCAN OpenAlex

Dates:

Submitted:	Sep 21, 1994
Accepted:	Jan 24, 1996
Published print:	Jul 1, 1996
Published online:	May 25, 2002

Identifiers:

Web of science:	WOS:A1996VC88000004
Scopus:	2-s2.0-0001140042
Elibrary:	13239722
Chemical Abstracts:	1996:504565
Chemical Abstracts (print):	125:149714
OpenAlex:	W2181961489

Citing:

DB	Citing
Web of science	45
Scopus	49
Elibrary	51
OpenAlex	39

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