Basicity of Ba-La -O-(F) Catalysts and Their Catalytic Performances for the OCM Reaction

Abstract

Abstract: The structure and surface basicity of a series of lanthanum based catalysts (La₂O₃, BaO/La₂O₃, BaF₂/La₂O₃, LaOF, BaF₂/LaOF) were characterized by XRD, CO₂-TPDand high temperature in situ FTIRspectroscopy of CO₂ adsorption. Both the results of CO₂ TPDand in situ FTIRspectra of CO₂ adsorption indicate that the basicity of the catalysts decreases in the sequence BaO/La₂O₃>La₂O₃>BaF₂/La₂O₃>BaF₂/LaOF>LaOF. The experiments of catalytic performance evaluation of the catalysts performed at 800 ℃ under the conditions of V (CH₄)/ V (O₂)=4 and GHSV= 15000 h^-1 indicate that the BaF₂ modified La₂O₃ and LaOFdemonstrate a better OCMperformance compared to the corresponding La₂O₃ and LaOF. These observations suggest that the surface basicity is not always a requisite attribution for a good OCMcatalyst.

Key words: Lanthanum based catalysts, Oxidative coupling of methane, Basicity, CO₂ adsorption, in situ IR, TPD

CLC Number:

O643.3

TrendMD:

WENG Wei-Zheng, CHEN Ming-Shu, WAN Hui-Lin, FANG Zhi-Min . Basicity of Ba-La -O-(F) Catalysts and Their Catalytic Performances for the OCM Reaction[J]. Chem. J. Chinese Universities, 2000, 21(4): 575.

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Basicity of Ba-La -O-(F) Catalysts and Their Catalytic Performances for the OCM Reaction

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