Effect of the Nature of the Precursor on the Activity of Copper-Containing Catalysts Based on Erionite in Oxidation of CO |
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Authors: | L P Oleksenko |
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Institution: | (1) Taras Shevchenko Kyiv National University, Vul. Volodymyrs'ka 64, 01033 Kyiv, Ukraine |
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Abstract: | We have studied the catalytic activity of copper-containing zeolite catalysts based on erionite (ERI) in oxidation of CO.
We have established that the activity of Cu-ERI systems is due to isolated coordination unsaturated Cu2+ cations which are stabilized in the catalyst on sites with strong tetragonal distortion and are reduced to Cu+ during catalysis. According to X-ray photoelectron spectroscopy (XPS), diffuse reflection electronic spectra, and temperature
programmed reduction by hydrogen (TPR-H2) spectra, activity differences between 3% Cu-ERI catalysts obtained from different precursors are determined by the different
numbers of Cu2+ cations capable of being reduced during the reaction at T < 400 °C: the higher the content of such cations in the samples,
the higher the activity of the Cu-ERI systems.
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Translated from Teoreticheskaya i Eksperimental'naya Khimiya, Vol. 41, No. 5, pp. 317–322, September–October, 2005. |
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Keywords: | Cu supported catalysts oxidation of CO temperature programmed reduction by hydrogen (TPR-H2) X-ray photoelectron spectra (XPS) |
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