Reducibility of Vanadium in Zeolite ZSM-5

Abstract

Abstract: The reducibility of V(Ⅳ, )-ZSM-5 and V₂O₅/ZSM-5(preapred by impregnation (Method I) and mechanical mixing(Method Ⅱ), respectivitly) was studied by TPR, XRD, ESRand XPStechniques, Some singificant information about phase changes during the reduction was obtained. It was found that the reduction temperature of V(v)dispersed on the surface of zeolite was lower than that of V₂O₅. However, V(v)in the lattice of ZSM-5 was more difficult to be reduced; Its reduction temperature is over l200 K. When the temperature was raised to or over 1370 K, V-ZSM-5 was converted into christobalite-structured phase, In this state, V(v)separated form the frameworks was completely reduced to the lower valence.

Key words: V-ZSM-5, TPR, ESR, Valence state of vanadium

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ZHANG Chun-Lei, WU Zhi-Yun. Reducibility of Vanadium in Zeolite ZSM-5[J]. Chem. J. Chinese Universities, 1994, 15(11): 1670.

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Reducibility of Vanadium in Zeolite ZSM-5

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