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FTIR Spectroscopic Study of CO Adsorption on Cu/SiO2: Formation of New Types of Copper Carbonyls

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Abstract

Adsorption of CO on a reduced Cu/SiO2 catalyst (1 wt% Cu) results in formation of Cu0–CO species characterized by an IR band at 2128 cm−1. During the contact of the sample with CO two new species characterized by bands at 2045 and 2018 cm−1 appear. Experiments on 12CO–13CO co-adsorption prove that they are carbonyls. The 2045 cm−1 species are assigned to Cu0(CO)2 geminal complexes formed on copper atoms with a low coordination number. During evacuation the geminal species lose one CO ligand, thus being converted into linear carbonyls (band at 2018 cm−1). Both species are not affected by hydrogen, but easily disappear in the presence of small amounts of oxygen.

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Authors and Affiliations

  1. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria

    Konstantin Hadjiivanov & Tzvetomir Venkov

  2. Department Chemie, Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), 81377, München, Germany

    Helmut Knözinger

Authors
  1. Konstantin Hadjiivanov
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  2. Tzvetomir Venkov
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  3. Helmut Knözinger
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Hadjiivanov, K., Venkov, T. & Knözinger, H. FTIR Spectroscopic Study of CO Adsorption on Cu/SiO2: Formation of New Types of Copper Carbonyls. Catalysis Letters 75, 55–59 (2001). https://doi.org/10.1023/A:1016759123842

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