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Catalysts 2015, 5(4), 2309-2323; doi:10.3390/catal5042309

Switching off H2O2 Decomposition during TS-1 Catalysed Epoxidation via Post-Synthetic Active Site Modification

Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, UK
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Academic Editor: Andreas Martin
Received: 28 October 2015 / Revised: 9 December 2015 / Accepted: 16 December 2015 / Published: 21 December 2015
(This article belongs to the Special Issue Zeolite Catalysis)
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Abstract

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. View Full-Text
Keywords: zeolites; Lewis acid; TS-1; H2O2; sustainable chemistry; epoxidation; catalysis zeolites; Lewis acid; TS-1; H2O2; sustainable chemistry; epoxidation; catalysis
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hammond, C.; Tarantino, G. Switching off H2O2 Decomposition during TS-1 Catalysed Epoxidation via Post-Synthetic Active Site Modification. Catalysts 2015, 5, 2309-2323.

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