The Dynamics of Oxygen Storage in Ceria–Zirconia Model Catalysts Measured by CO Oxidation under Stationary and Cycling Feedstream Compositions

Measurements were made of the dynamics of CO oxidation over a series of fresh and aged CeO2–ZrO2 catalysts of different composition. In order to evaluate the varying contributions to oxygen storage/release capacity, we carried out the reaction under transient “anaerobic environment” (in both pulse a...

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Published in:Journal of catalysis 2000-07, Vol.193 (2), p.338-347
Main Authors: Boaro, Marta, de Leitenburg, Carla, Dolcetti, Giuliano, Trovarelli, Alessandro
Format: Article
Language:English
Subjects:
auto-exhaust catalysts
Catalysis
Catalysts: preparations and properties
CeO2
CeO2–ZrO2
ceria
ceria–zirconia
Chemistry
CO oxidation
Exact sciences and technology
General and physical chemistry
oxygen diffusion coefficients
oxygen storage capacity
redox behavior
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
three-way catalysts
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container_title Journal of catalysis
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creator Boaro, Marta
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Dolcetti, Giuliano
Trovarelli, Alessandro
description Measurements were made of the dynamics of CO oxidation over a series of fresh and aged CeO2–ZrO2 catalysts of different composition. In order to evaluate the varying contributions to oxygen storage/release capacity, we carried out the reaction under transient “anaerobic environment” (in both pulse and cycling mode) and steady-state conditions. The presence of ZrO2 was of little or no benefit to stoichiometric CO oxidation carried out under stationary conditions. Under these conditions, catalytic activity is strongly dependent on surface area and on the number of exposed cerium atoms. The highest performance level is achieved with pure ceria. The beneficial effect of CeO2–ZrO2 mixed oxides on catalytic performance was observed when CO oxidation was carried out in transient pulse mode or under cycling feedstream composition. In this case, catalysts having the composition CexZr1−xO2 with 0.5
doi_str_mv 10.1006/jcat.2000.2887
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In order to evaluate the varying contributions to oxygen storage/release capacity, we carried out the reaction under transient “anaerobic environment” (in both pulse and cycling mode) and steady-state conditions. The presence of ZrO2 was of little or no benefit to stoichiometric CO oxidation carried out under stationary conditions. Under these conditions, catalytic activity is strongly dependent on surface area and on the number of exposed cerium atoms. The highest performance level is achieved with pure ceria. The beneficial effect of CeO2–ZrO2 mixed oxides on catalytic performance was observed when CO oxidation was carried out in transient pulse mode or under cycling feedstream composition. In this case, catalysts having the composition CexZr1−xO2 with 0.5&lt;x&lt;0.8 show an increased catalytic effectiveness correlated to their oxygen storage capacity and redox activity. The promotional effect of ZrO2 was much more evident after severe aging. The decrease in oxygen storage activity with pure CeO2 was higher than that observed for ceria-zirconia and was mainly correlated to the drop in surface area. In contrast with ceria, the low-temperature activity of CeO2–ZrO2 solid solutions for CO oxidation under anaerobic conditions was positively dependent on the degree of reduction of the material. A quantitative estimate of the contribution of bulk diffusion to the overall performance was carried out by calculating the O2− diffusion coefficient. These values were calculated from conductivity measurements using the Nernst–Einstein relation. 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In order to evaluate the varying contributions to oxygen storage/release capacity, we carried out the reaction under transient “anaerobic environment” (in both pulse and cycling mode) and steady-state conditions. The presence of ZrO2 was of little or no benefit to stoichiometric CO oxidation carried out under stationary conditions. Under these conditions, catalytic activity is strongly dependent on surface area and on the number of exposed cerium atoms. The highest performance level is achieved with pure ceria. The beneficial effect of CeO2–ZrO2 mixed oxides on catalytic performance was observed when CO oxidation was carried out in transient pulse mode or under cycling feedstream composition. In this case, catalysts having the composition CexZr1−xO2 with 0.5&lt;x&lt;0.8 show an increased catalytic effectiveness correlated to their oxygen storage capacity and redox activity. The promotional effect of ZrO2 was much more evident after severe aging. The decrease in oxygen storage activity with pure CeO2 was higher than that observed for ceria-zirconia and was mainly correlated to the drop in surface area. In contrast with ceria, the low-temperature activity of CeO2–ZrO2 solid solutions for CO oxidation under anaerobic conditions was positively dependent on the degree of reduction of the material. A quantitative estimate of the contribution of bulk diffusion to the overall performance was carried out by calculating the O2− diffusion coefficient. These values were calculated from conductivity measurements using the Nernst–Einstein relation. It is shown that, in the temperature range investigated, bulk diffusion was approximately two orders of magnitude higher for ceri a–zirconia than for ceria and may have been responsible for the enhancement of CO conversion observed with respect to ceria–zirconia-based catalysts.</description><subject>auto-exhaust catalysts</subject><subject>Catalysis</subject><subject>Catalysts: preparations and properties</subject><subject>CeO2</subject><subject>CeO2–ZrO2</subject><subject>ceria</subject><subject>ceria–zirconia</subject><subject>Chemistry</subject><subject>CO oxidation</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>oxygen diffusion coefficients</subject><subject>oxygen storage capacity</subject><subject>redox behavior</subject><subject>Theory of reactions, general kinetics. Catalysis. 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The decrease in oxygen storage activity with pure CeO2 was higher than that observed for ceria-zirconia and was mainly correlated to the drop in surface area. In contrast with ceria, the low-temperature activity of CeO2–ZrO2 solid solutions for CO oxidation under anaerobic conditions was positively dependent on the degree of reduction of the material. A quantitative estimate of the contribution of bulk diffusion to the overall performance was carried out by calculating the O2− diffusion coefficient. These values were calculated from conductivity measurements using the Nernst–Einstein relation. 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subjects auto-exhaust catalysts
Catalysis
Catalysts: preparations and properties
CeO2
CeO2–ZrO2
ceria
ceria–zirconia
Chemistry
CO oxidation
Exact sciences and technology
General and physical chemistry
oxygen diffusion coefficients
oxygen storage capacity
redox behavior
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
three-way catalysts
title The Dynamics of Oxygen Storage in Ceria–Zirconia Model Catalysts Measured by CO Oxidation under Stationary and Cycling Feedstream Compositions
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