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Switching off H2O2 decomposition during TS-1 catalysed epoxidation via post-synthetic active site modification

Hammond, Ceri and Tarantino, Giulia 2015. Switching off H2O2 decomposition during TS-1 catalysed epoxidation via post-synthetic active site modification. Catalysts 5 (4) , pp. 2309-2323. 10.3390/catal5042309

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff Catalysis Institute (CCI)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: MDPI
ISSN: 2073-4344
Funders: The Royal Society
Date of First Compliant Deposit: 18 April 2017
Date of Acceptance: 16 December 2015
Last Modified: 27 Mar 2020 02:33
URI: http://orca.cardiff.ac.uk/id/eprint/84373

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