Abstract
Mesoporous W-KIT-6 catalysts with various Si/W ratios were prepared by one-pot direct hydrothermal reactions and were studied in metathesis of 1-butene and ethene to propene. The catalysts were characterized by N2 physical adsorption, XRD, TEM, UV-DRS, FTIR and Raman. The characterization results showed that tungsten species could be finely dispersed in the framework of KIT-6 at Si/W ratios higher than 25, while a large amount of bulk WO3 was present on W-KIT-6 catalyst with a Si/W ratio of 15. The 1-butene conversion and propene selectivity increased with the decreasing Si/W ratio from 80 to 25 due to more active tungsten oxides species generated, and then decreased when the Si/W ratio further declined to 15 caused by the formation of inactive bulk WO3. The optimal Si/W ratio was 25 for obtaining highly dispersed active W species and excellent catalytic performance.
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