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

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摘要 he deactivation of highly active multicomponent oxide LiLa_0.5 Ti_0.5 O_(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, O_2-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. he deactivation of highly active multicomponent oxide LiLa_0.5 Ti_0.5 O_(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, O_2-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.
出处 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 1994年第4期321-326,共6页 高等学校化学研究(英文版)
关键词 Catalyst Oxidative coupling of methane DEACTIVATION Titanium-Lan-thanum-Lithium multicomponent oxide Catalyst , Oxidative coupling of methane, Deactivation, Titanium-Lan-thanum-Lithium multicomponent oxide
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