Metathesis of Butylene-2 and Ethylene to Propylene over 3.0Mo/(Hβ+γ-Al2O3) Catalysts with Different γ-Al2O3 Contents

Abstract

Abstract: A series of 3.0Mo/(Hβ+γ-Al₂O₃) samples with γ-Al₂O₃ contents in the range of 0-100% (mass fraction) was studied by means of XRD, NH₃-TPD, TPR and BET determinations for characterizing their structures.The Hβ zeolite structure in the 3.0Mo/Hβ sample can be effectively stabilized by adding some γ-Al₂O₃to Hβ zeolite.γ-Al₂O₃ mainly favors the formation of polymolybdate or multilayered Mo oxide, while Hβmainly forms the Al₂(MoO₄)3 species, as evaluated by the TPR technique.When used as the catalyst for the metathesis of butylene-2 and ethylene to propylene, there exists a close correlation between the specific surface area and stability of the catalyst.The specific surface area of the catalyst shows the maximum when (Hβ+ γ-Al₂O₃) contains 30%γ-Al₂O₃, which is in agreement with that of the time needed for the reaction stablization.In the case of maximum surface area, the rate of coke deposition is the minimum.

Key words: Butylene-2, Ethylene, Propylene, Metathesis, Mo-impregnated (Hβ+γ-Al₂O₃) catalyst, γ-Al₂O₃ content, TPR/TPD/XRD characterization

LIU Sheng-lin, HUANG Sheng-jun, XIN Wen-Jie, BAI Jie, XIE Su-juan, XU Long-ya. Metathesis of Butylene-2 and Ethylene to Propylene over 3.0Mo/(Hβ+γ-Al₂O₃) Catalysts with Different γ-Al₂O₃ Contents[J]. Chemical Research in Chinese Universities, 2005, 21(2): 213-216.

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Metathesis of Butylene-2 and Ethylene to Propylene over 3.0Mo/(Hβ+γ-Al₂O₃) Catalysts with Different γ-Al₂O₃ Contents

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