Self-metathesis of 1-butene to propene over SBA-15-supported WO3. Issue 14 (7th April 2016)

• Record Type: Journal Article
• Authors: Chen, Gang; Dong, Mei; Li, Junfen; Wu, Zhiwei; Wang, Guofu; Qin, Zhangfeng; Wang, Jianguo; Fan, Weibin
• Is Part Of: Catalysis science & technology. Volume 6:Issue 14(2016)
• Page Start: 5515
• Page End: 5525
• Publication Date: 2016-04-07
• Subjects: Catalysis -- Periodicals; 541.395
• DOI: 10.1039/c6cy00248j
• Languages: English
• ISSNs: 2044-4753

Abstract

Abstract : Self-metathesis of 1-butene on SBA-15-supported WO3 occurs via isomerization on Brønsted and Lewis acid sites and subsequent metathesis on Si–O–W–OH. Abstract : A series of SBA-15-supported WO3 catalysts was prepared by impregnating silicotungstic acid on SBA-15 (HSiW-SBA-15) and subsequently calcining at different temperatures. It shows higher catalytic activity and stability than the physical mixtures of SBA-15 and WO3 in the self-metathesis of 1-butene to propene. The calcination temperature of HSiW-SBA-15 has a significant effect on its catalytic performance. The sample calcined at 700 °C gave a 1-butene conversion and a propene selectivity of 59.6% and 59.7%, respectively, at 350 °C. It was found that the metathesis of 1-butene to propene occurred via two steps. The first one was isomerization of 1-butene to 2-butene on both Brønsted and Lewis acid sites, and the second one was metathesis of 1-butene and 2-butene to propene via the formation of W-carbene species (WCHCH3, WCH2 and WCHCH2 CH3 ). The Si–O–W–OH Brønsted acid sites play a decisive role in the formation of W-carbene species, and the pseudo-Wittig mechanism dominates the process.