THE STRUCTURE-ACTIVITY RELATIONSHIP OF RE2O7 METATHESIS CATALYSTS SUPPORTED ON PHOSPHATED ALUMINA AND SILICA-ALUMINA

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作者：
SPRONK, R
MOL, JC
机构：
来源：
STUDIES IN SURFACE SCIENCE AND CATALYSIS | 1993年 / 75卷
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中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The structure of the rhenium oxide phase in Re2O7 metathesis catalysts supported on phosphated alumina and silica-alumina was studied by means of X-ray photoelectron spectroscopy and Raman spectroscopy. It appeared that in phosphated alumina-supported catalysts the rhenium oxide is present as monomeric ReO4 species under ambient conditions at any loading. In silica-alumina-supported catalysts, however, the rhenium oxide is predominantly present as monomers at low loadings, but at higher loadings (>3 wt% Re2O7) a large fraction of the rhenium oxide is present in three-dimensional clusters. The activity of the silica-alumina-supported catalysts, measured during propene metathesis, was much higher than the activity of (phosphated) alumina-supported catalysts.
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页码：2071 / 2074
页数：4
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