NDLI: EXAFS and XPS Investigations of Cu/ZnO Catalysts and Their Interaction with CO and Methanol

Content Provider	SpringerLink
Author	Kulkarni, G.U. Rao, C.N.R.
Copyright Year	2003
Abstract	Several investigations have been carried out on Cu/ZnO catalysts by employing extended Xray absorption fine structure (EXAFS) and Xray photoelectron spectroscopy (XPS). EXAFS investigations of Cu/ZnO catalysts subjected to hydrogen reduction show the presence of Cu$^{1+}$ species and Cu microclusters. The proportion of Cu$^{1+}$ depends on the rate of increase of the reduction temperature and on the amount of alumina added. An XPS study of the interaction of CO with model Cu/ZnO catalysts prepared in situ in the electron spectrometer shows the formation of CO$_{2}$ $^{-}$, CO$_{3}$ $^{2-}$ and C$_{2}$O$_{4}$ $^{2-}$ species, their proportion relative to CO increasing with the Cu$^{1+}$/Cu$^{0}$ ratio. A study of the interaction of CH$_{3}$OH with Cu clusters deposited on ZnO films reveals reversible molecular adsorption and the formation of CH$_{3}$O on clean Cu clusters. If the Cu clusters are pretreated with oxygen, however, both CH$_{3}$O and HCOO$^{-}$ species are produced. Model Cu/ZnO catalyst surfaces containing both Cu$^{1+}$ and Cu$^{0}$ species show interesting oxidation properties. On a Cu$^{0}$-rich catalyst surface, only the CH$_{3}$O species is formed on interaction with CH$_{3}$OH. On a Cu$^{1+}$rich surface, the HCOO$^{-}$ ion is the predominant species.
Starting Page	183
Ending Page	189
Page Count	7
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	22
Issue Number	3-4
e-ISSN	15729028
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Physical Chemistry Industrial Chemistry/Chemical Engineering Catalysis Characterization and Evaluation Materials Pharmacy
Content Type	Text
Resource Type	Article
Subject	Catalysis Chemistry

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