Evidence for the adsorption of molecules at special sites located at copper/zinc oxide interfaces. Part 2. -- A fourier-transform infrared spectroscopy study of methanol adsorption on reduced and oxidised Cu/ZnO/SiO2 catalysts


Autoria(s): Millar, Graeme J.; Rochester, Colin H.; Waugh, Kenneth C.
Data(s)

1992

Resumo

FTIR spectra are reported of methanol adsorbed at 295 K on ZnO/SiO 2, on reduced Cu/ZnO/SiO2 and on Cu/ZnO/SiO2 which had been preoxidised by exposure to nitrous oxide. Methanol on ZnO/SiO2 gave methoxy species on ZnO and SiO, in addition to both strongly and weakly physisorbed methanol on SiO2. The corresponding adsorption of methanol on reduced Cu/ZnO/SiO2 also gave methoxy species on Cu and a small amount of bridging formate. Reaction of methanol with a reoxidised Cu/ZnO/SiO2 catalyst resulted in an enhanced quantity of methoxy species on Cu. Heating adsorbed species on Cu/ZnO/SiO2 at 393 K led to the loss of methoxy groups on Cu and the concomitant formation of formate species on both ZnO and Cu. The comparable reaction on a reoxidised Cu/ZnO/SiO2 catalyst gave an increased amount of formate species on ZnO and this correlated with an increased quantity of methoxy groups lost from Cu. An explanation is given in terms of adsorption of formate and formaldehyde species at special sites located at the copper/zinc oxide interface.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/61975/

Relação

http://eprints.qut.edu.au/61975/1/J._Chem._Soc.%2C_Faraday_Trans.%2C_1992%2C88%2C_2257-2261.pdf

DOI:10.1039/FT9928802257

Millar, Graeme J., Rochester, Colin H., & Waugh, Kenneth C. (1992) Evidence for the adsorption of molecules at special sites located at copper/zinc oxide interfaces. Part 2. -- A fourier-transform infrared spectroscopy study of methanol adsorption on reduced and oxidised Cu/ZnO/SiO2 catalysts. Journal of the Chemical Society, Faraday Transactions, 88(15), pp. 2257-2261.

Direitos

Copyright 1992 Please consult the authors

Fonte

School of Chemistry, Physics & Mechanical Engineering; Institute for Future Environments; Science & Engineering Faculty

Palavras-Chave #030601 Catalysis and Mechanisms of Reactions #catalyst #infrared #copper #methanol
Tipo

Journal Article