Spectroscopic evidence of Cu-Al interactions in Cu-Zn-Al mixed oxide catalysts used in CO hydrogenation
- CSIC, Madrid (Spain). Inst. de Catalisis y Petroleoquimica
Three different Cu-Zn-Al catalysts (Cu:Zn:Al atomic ratio 60:38:2) were prepared by coprecipitation of the three metals (from their nitrate salts) either by separately precipitating each metal (Cu + Zn + Al), two metals (Cu and Zn coprecipitated + Al) before mixing together, or by precipitating the three of them together. XPS analysis detected a remarkably high Al enrichment at the surface of all calcined or reduced samples, along with a binding energy of the Cu 2p{sub 3/2} core level peak assigned to Cu{sup 2+} in CuAl{sub 2}O{sub 4}-like environment in the calcined state. ESR spectra of calcined samples showed signals attributed to surface Cu{sup 2+} species with Al entities in their surroundings for samples in which Cu and Zn are coprecipitated and aged together. The higher Cu dispersion observed after reduction for these catalysts is attributed to the development of such interactions at the surface of Al-containing calcined samples.
- OSTI ID:
- 659076
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 178; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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