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催化剂的氢吸附与反应性能间的关联研究——Ⅳ.吸氢中心的来源及其与表面性质的关系 被引量:3

CORRELATION OF H_2 ADSORPTION WITH REACTION PERFORMANCE FOR SUPPORTED Pt CATALYST Ⅳ. NATURE OF ADSORPTION SITES AND THEIR RELATIONS WITH SURFACE PROPERTIES
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摘要 本文着重讨论了铂催化剂上三类吸氢中心的来源以及它们与催化剂表面性质间的关系。研究表明,α和β两类吸附是铂固有吸附特征的体现,分别发生在铂簇团的表层及内层缺陷上,这两类吸附的变化充分反映了铂簇团的结构特征的变化;γ氢吸附主要来源于氢的溢流行为,此类吸附与载体的酸性密切相关,并且它的可逆和不可逆吸附分别与B酸和L酸之间呈一定的关系,在一定程度上揭示了氢溢流的本质。文中对于这些现象进行了详细的论述。 In this study, the nature of three chemisorption sites of H_2 on Pt catalyst and the relations between these sites and surface properties were investigated. The results indicated that Site α and Site β existed on the surface of Pt and in the defect of Pt clusters respectively, the variation of hydrogen chemisorption on two sites could show the change in the structure character of Pt clusters; while Site γ originated from the support effect and hydrogen on this site could be attributed to the spillover of hydrogen from Pt to the support. Furthermore, the adsorption of hydrogen on Site γ showed a dependence on the support acidity, and the reversible and the irreversible uptake of hydrogen were related to B and L acidity of catalyst. This, to some extent, revealed the nature of hydrogen spillover.
出处 《石油学报(石油加工)》 EI CAS CSCD 北大核心 1992年第4期69-74,共6页 Acta Petrolei Sinica(Petroleum Processing Section)
基金 国家自然科学基金
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