Characterization and catalytic performance of rhenium oxide-based catalysts supported on borated silica-alumina

Abstract

A series of alumino-silicates with an alumina content varying from 15 to 75 wt.% were prepared by the sol–gel method. These oxides, modified or not with boria, were characterized by several techniques and used as supports for rhenium oxide. The resulting catalysts, after promotion with SnBu 4, were evaluated in the metathesis of methyl oleate. The best system was obtained when 75 wt.% Al 2O 3 silica-alumina modified with 7.5 wt.% B 2O 3 was the support for 2 wt.% Re 2O 7. FT-IR studies suggest that the catalytic activity is related to the Brönsted acidity of the support.