The Characterization of CuZnZrY Oxide Catalyst in the Steam Reforming of Methanol by EPR and XPS Spectroscopies

• Autorzy: Skrzypek D. , Krupa K. , Talik E. , Widuch S.
• Języki publikacji: EN

Abstrakty

EN

In this paper we have developed the characterization of catalyst containing mainly CuO and ZnO with the addition of zirconium and yttrium oxides, using electron paramagnetic resonance (EPR) and X-ray photoelectron (XPS) spectroscopies. The obtained results support the stepwise reduction mechanism of Cu2+ ions. For the catalyst before the steam reforming of methanol reaction (SRM) the copper species were identified as isolated Cu2+ ions. The values of EPR parameters indicate the coordination of four oxygen atoms around Cu(II) in distorted axial configuration. For the catalyst after SRM reaction the EPR spectrum is complex and four types paramagnetic copper species (S1 - S4) could be identified. From theXPS results it is evident that the copper is in a reduced state in the catalyst after reaction. The fitting ofO1s spectrum proves the presence of hydroxide and carbonate anions apart from oxide surface phase. Combining the results of EPR and XPS methods it can be suggested that the S2 - S4 species are present on a surface.

Słowa kluczowe

EN

EPR; Cu based catalyst; X-ray photoelectron spectroscopy

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2007
• Tom: Vol. 81, nr 2
• Strony: 257--268
• Opis fizyczny: Bibliogr. rys.

Twórcy

autor

Skrzypek D.

autor

Krupa K.

autor

Talik E.

autor

Widuch S.

• Chelkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland

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