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Optimization of CO Oxidation Catalysts for Thermocatalytic and Semiconducting Gas Sensors

  • INORGANIC MATERIALS AND NANOMATERIALS
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Abstract

Kinetics of catalytic CO oxidation on the surface of metal oxide catalysts decorated with noble metals used as gas-sensing materials for sensors has been studied. The majority of oxide materials (SnO2, Al2O3, zeolite, etc.) decorated with palladium and rhodium shows kinetic features resulting in ambiguous sensor response. Exception is CeO2/ZrO2 decorated with palladium: oxidation rate on this catalyst has a unique dependence on CO concentration. The processes of CO oxidation on inert and chemically reactive supports are described in the context of unified kinetic model. There are two modes of catalyst behavior: below and above a certain concentration threshold, the reaction in each mode has first kinetic order toward CO, while the superposition of these processes can result in efficient “minus one” order of oxidation reaction. The transition of catalyst from one state to another occurs as phase transition observed on change in CO concentration but not catalysts temperature. Oxidation kinetics for each state is described by a small set of parameters characteristic for each catalyst, activation energy for each catalyst is the same at all CO and oxygen concentrations.

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Funding

This work was supported by the Russian Foundation for Basic Research (project no. 18-29-24128).

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Authors and Affiliations

  1. National Research Center, Kurchatov Institute, 123182, Moscow, Russia

    A. A. Vasiliev, A. S. Lagutin & Sh. Sh. Nabiev

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  1. A. A. Vasiliev
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  2. A. S. Lagutin
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  3. Sh. Sh. Nabiev
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Correspondence to A. A. Vasiliev.

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Translated by I. Kudryavtsev

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Vasiliev, A.A., Lagutin, A.S. & Nabiev, S.S. Optimization of CO Oxidation Catalysts for Thermocatalytic and Semiconducting Gas Sensors. Russ. J. Inorg. Chem. 65, 1948–1957 (2020). https://doi.org/10.1134/S0036023620120190

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