Investigation of Mechanisms About Effects of Promoters P2O5,K2O and Al2O3 on Oxidation of o-Xylene to Phthalic Anhydride

Abstract

Abstract: We succeeded in designing an effective catalyst, V₂O₅-P₂O₅-K₂O/Al₂O₃. SiO₂, by which a high yield of PA,105wt% can be gained in middle-sized industrial fluidized bed apparatus without addition of any promoting gas.The mechanisms of effects of P₂O₅, K₂Oand Al₂O₃ on the surface properties of V2O₅ were investigated by means of TPDand XRD. And the selectivity of oxidation are explained.Addition of a great deal of P₂O₅ restrains the activity of donating surface oxygen from V2O₅, but increases the number of sites which donate surface oxygen. Addition of K₂Opromotes donation of surface oxygen from V2O₆, and decreases the number of sites of donating oxygen, on the other hand, addition of K|Omakes the surface structure of V₂O₅ catalysts more stable. Coating a small amount of Al₂O₂ onto support, SiO₂, restrains the activity of donating oxygen and increases the number of sites of donating surface oxygen from V₂O₅.

Key words: Catalyst, Oxidation, Phthalic anhydride, o-Xylene

Zheng Xiaoming, He Weilian, Yuan Xianxin, Zhou Lichua, Jin Songshou . Investigation of Mechanisms About Effects of Promoters P₂O₅,K₂O and Al₂O₃ on Oxidation of o-Xylene to Phthalic Anhydride[J]. Chemical Research in Chinese Universities, 1990, 6(2): 141-148.

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Investigation of Mechanisms About Effects of Promoters P₂O₅,K₂O and Al₂O₃ on Oxidation of o-Xylene to Phthalic Anhydride

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