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O. Metelkina, V. Lunin, V. Sadykov, G. Alikina, R. Bunina, E. Paukshtis, V. Fenelonov, A. Derevyankin, U. Schubert, J. Ross:
"A Sol-Gel Derived CuO_x/Al₂O₃-ZrO₂ Catalyst for the Selective Reduction of NO by Propane in the Presence of Excess Oxygen";
Catalysis Letters, 78 (2002), 111 - 114.

Copper catalysts supported on alumina-doped zirconia were prepared by sol-gel processing followed by supercritical drying or aging in the mother solution at 100 °C. After drying and calcination, the catalyst supports were impregnated with a copper(II) nitrate aqueous solution by the incipient wetness method to achieve a Cu loading of about 2%. The samples showed ~90% NO conversion at 350-400 °C. The catalytic performance of these systems appears to be determined by the degree of clustering of copper cations as probed by FTIR spectroscopy of adsorbed CO.