NDLI: A two-step reaction mechanism of oxygen release from Pd/CeO$_{2}$: mathematical modelling based on step gas concentration experiments

Content Provider	Springer Nature Link
Author	Christou, S. Y. Costa, C. N. Efstathiou, A. M.
Copyright Year	2004
Abstract	A mathematical model has been developed to study the transient release of oxygen from a 1 wt% Pd/CeO$_{2}$ catalyst in the 450–550 °C range based on alternate step concentration switches between CO and O$_{2}$. A two-step reaction mechanism that involves the reaction of gaseous CO with the oxygen species of PdO and of the back-spillover of oxygen from ceria to the oxygen vacant sites of surface PdO has been proven to better describe the CO and CO$_{2}$ transient response curves. The proposed mathematical model allows the estimation of the transient rates of the CO oxidation reaction and of the back-spillover of oxygen process. It also allows the calculation of the intrinsic rate constant k $_{1}$ (s$^{−1}$) of the Eley–Rideal step for the reaction of gaseous CO with surface oxygen species of PdO to form CO$_{2}$. An activation energy of 10.1 kJ/mol was estimated for this elementary reaction step. In addition, an apparent rate constant $$k_2^{app} (s^{-1})$$ was estimated for the process of back-spillover of oxygen.
Starting Page	325
Ending Page	331
Page Count	7
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	30
Issue Number	1-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	transient CO oxidation oxygen storage capacity oxygen back-spillover Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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