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An X-ray Photoelectron Spectroscopic Study of Copper Chromite Catalysts
Volume 33, Number 4 (Aug. 1979) Page 380-384
Schreifels, J.A.; Rodero, A.; Swartz, W.E.
A series of copper chromite catalysts have been studied by x-ray photoelectron spectroscopy. The data indicate that in the as-received form the copper is present as a mixture of Cu(OH)2 and CuO. After calcination at 500°C only CuO is present. The chromium is present as Cr+3 and Cr+6 when no promoter is added. When a BaO promoter is added, the Cr+6 is stabilized. Calcination at 500°C for varying periods of time alter the relative amounts of Cr+3 and Cr+6 on the catalytic surface. In addition, the relative amounts of the various oxidation states are a function of calcination temperature. At a calcination temperature of 240°C a Cr+5 surface species is reproducibly observed in one of the catalysts.