Abstract
Except at very high temperatures, NO is thermodynamically unstable relative to N2 and O2. Simple cleavage of the N-O bond is all that should be necessary for its decomposition. However, to date no solid catalyst has been developed that will effect this direct decomposition rapidly in an oxidizing atmosphere under relatively mild conditions. This paper will review the types of materials that have been tested, the factors that limit their activity, and the kinetics and mechanism of the reaction. Noble metals (mainly platinum, rhodium, and ruthenium) either in pure or alloyed states, as well as pure and mixed oxides (e.g. cobalt oxide, nickel oxide, zirconia, certain perovskites, etc.) will be discussed. It appears that most of these materials are active in a reduced state, but the oxygen released from the decomposed NO remains strongly attached to the surface and poisons the activity. High temperatures and/or gaseous reductants are required to remove the surface oxygen and regenerate the catalytic activity. Furthermore, oxygen from the gas phase competes with NO for the adsorption sites, and the kinetics over many of these catalysts can be adequately described by simple Langmuir-Hinshelwood kinetics involving competition between NO and O2.
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Hightower, J.W., Van Leirsburg, D.A. (1975). Current Status of the Catalytic Decomposition of NO. In: Klimisch, R.L., Larson, J.G. (eds) The Catalytic Chemistry of Nitrogen Oxides. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8741-5_5
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DOI: https://doi.org/10.1007/978-1-4615-8741-5_5
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