Deactivation of Ti-La-Li Multicomponent OxideCatalyst for Oxidative Coupling of Methane

Abstract

Abstract: The deactivation of highly active multicomponent oxide LiLa_0.5 Ti_0.5O_2+λ cata-lyst at high reaction temperatures has been studied.The surface and bulk structureof the catalyst were characterized by means of XRD, IR, XPS, BET, O₂-TPD,SEM etc..The results show that the deactivation of the catalyst at high reactiontemperatures is mainly due to the loss of surface lithium.As a result,the diffusionof lithium from bulk to surface leads to the decompositiqn of the active phase con-taining lithium, which lowers tlie number of oxygen vacancies and decreases themobility of lattice oxygen.

Key words: Catalyst, Oxidative coupling of methane, Deactivation, Titanium-Lan-thanum-Lithium multicomponent oxide

ZHAO Zhen, YUAN Song-yue, YU Zuo-long. Deactivation of Ti-La-Li Multicomponent OxideCatalyst for Oxidative Coupling of Methane[J]. Chemical Research in Chinese Universities, 1994, 10(4): 321-326.

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Deactivation of Ti-La-Li Multicomponent OxideCatalyst for Oxidative Coupling of Methane

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