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Citation: Hu Gang. X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF SURFACE SEGREGATION OF Sb-Fe MIXED OXIDE CATALYSTS DURING HEAT[J]. Acta Physico-Chimica Sinica, ;1987, 3(03): 237-241. doi: 10.3866/PKU.WHXB19870304 shu

X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF SURFACE SEGREGATION OF Sb-Fe MIXED OXIDE CATALYSTS DURING HEAT

Hu Gang

1.
Changchun Institute of Applied Chemistry; Academia Sinica

Received Date: 16 September 1985
Available Online: 15 June 1987

The surface composition of antimony-iron mixed oxide catalysts has been foundto be dependent upon heat treatment, the surface becoming progressively enriched in antimony at elevated temperature. Surface segregation of antimony has been in-vestigated by X-ray photoelectron spectroscopy (XPS) and values of segregation heat have been obtained. When the ratio of Sb to Fe in the bulk is 0.44, theirratio on surface is approximately 2. It is supposed that surface formation in Sb-Fe mixed oxide catalysts is FeSb_2O_6. The value 0.44 is the critical concentration of Sb segregation to form FeSb_2O_6. Below this critical value and so segregation of the FeSb_2O_6 phase is not observed.
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