期刊
CATALYSTS
卷 5, 期 4, 页码 2309-2323出版社
MDPI AG
DOI: 10.3390/catal5042309
关键词
zeolites; Lewis acid; TS-1; H2O2; sustainable chemistry; epoxidation; catalysis
资金
- Royal Society [UF140207, RG140754]
Despite its widespread use, the Lewis acidic zeolite, TS-1, still exhibits several unfavourable properties, such as excessive H2O2 decomposition, which decrease its overall performance. In this manuscript, we demonstrate that post-synthetic modification of TS-1 with aqueous NH4HF2 leads to modifications in epoxidation catalysis, which both improves the levels of epoxide selectivity obtained, and drastically minimises undesirable H2O2 decomposition. Through in situ spectroscopic study with UV-resonance enhanced Raman spectroscopy, we also observe a change in Ti site speciation, which occurs via the extraction of mononuclear [Ti(OSi)(4)] atoms, and which may be responsible for the changes in observed activity.
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