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WOx/C Heterogeneous Catalyst with Oxygen Vacancies and Deficient Brönsted Acid for Epoxidation of 1-Hexene
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WOx/C Heterogeneous Catalyst with Oxygen Vacancies and Deficient Brönsted Acid for Epoxidation of 1-Hexene
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Journal Article
WOx/C Heterogeneous Catalyst with Oxygen Vacancies and Deficient Brönsted Acid for Epoxidation of 1-Hexene
2023
Overview
WOx has good performance in olefin epoxidation, however, the presence of a large amount of Brönsted acid on WOx affects the selectivity of epoxy products. In this paper, broken carbon spheres (b-C spheres) treated with nitric acid were used as support to anchor WOx in dynamic solvothermal process. Based on GC–MS and GC-IR detection, the obtained WOx/C greatly increased selectivity of 1,2-epoxyhexane from 16.0% (pure WOx) to 92.1% in epoxidation of 1-hexene. The improvement of WOx performance is attributed to the reduction of Brönsted acid sites and electron cloud density after loading, which may all result from interaction between WOx and oxygen-containing functional groups of b-C spheres. Above changes not only effectively inhibit the hydrolysis of 1,2-epoxyhexane, but also are conducive to nucleophilic reaction of H2O2 to WOx, which is beneficial to the activation of H2O2. Finally, an epoxidation mechanism with oxygen vacancies as the main route under WOx/C catalysis is reasonably proposed.
Publisher
Springer Nature B.V
Subject
