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

Authors: Hadjiivanov K.¹; Venkov T.¹; Knözinger H.²

Source: Catalysis Letters, Volume 75, Numbers 1-2, August 2001 , pp. 55-59(5)

Publisher: Springer

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Abstract:

Adsorption of CO on a reduced Cu/SiO_2 catalyst (1 wt% Cu) results in formation of Cu^0–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 Cu^0(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.

Keywords: adsorption; FTIR spectroscopy; carbon monoxide; copper; copper carbonyls

Language: English

Document Type: Regular paper

Affiliations: 1: Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria 2: Department Chemie, Physikalische Chemie, Universität München, Butenandtstrasse 5-13 (Haus E), 81377 München, Germany

Publication date: 2001-08-01