Skip to main content

Research Repository

Advanced Search

Surface-active hollow titanosilicate particles as a Pickering interfacial catalyst for liquid-phase alkene epoxidation reactions

Lv, Guojun; Wang, Fumin; Zhang, Xubin; Binks, Bernard P.

Authors

Guojun Lv

Fumin Wang

Xubin Zhang



Abstract

Design of catalyst particles bearing excellent catalytic activity and suitable surface wettability is the key to the successful application of Pickering interfacial catalysis. In this study, the epoxidation of 1-hexene and cyclohexene with aqueous hydrogen peroxide over hollow TS-1 zeolite was studied as probe reactions to investigate the influence of catalyst surface wettability on catalytic activity. Hydrophobized hollow TS-1 particles (HTS-1) were fabricated via a post-synthesis desilication treatment with tetrapropylammonium hydroxide (TPAOH) and a post-synthesis silylation treatment with hexamethyldisiloxane (HMDSO). The successful preparation of HTS-1 particles was verified by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Fourier-transform infrared spectroscopy (FTIR). X-ray diffraction patterns and UV-visible spectra confirmed that hydrophobic modification had no effect on the zeolite structure of HTS-1 particles. Stable Pickering emulsions of aqueous hydrogen peroxide in either 1-hexene or cyclohexene could be prepared using HTS-1 particles as emulsifier and confirmed by cryo-SEM images. The catalytic behaviour in the obtained Pickering emulsions revealed a parabolic distribution of turnover frequency (TOF) values with respect to the hydrophobization degree with 0.2-HMDSO/HTS-1 particles possessing the maximum value of 20.6 h-1 for 1-hexene epoxidation and 8.1 h-1 for cyclohexene epoxidation. In addition, these 0.2-HMDSO/HTS-1 particles showed good re-usability for more than five cycles.

Citation

Lv, G., Wang, F., Zhang, X., & Binks, B. P. (2018). Surface-active hollow titanosilicate particles as a Pickering interfacial catalyst for liquid-phase alkene epoxidation reactions. Langmuir : the ACS journal of surfaces and colloids, 34(1), 302-310. https://doi.org/10.1021/acs.langmuir.7b03633

Journal Article Type Article
Acceptance Date Dec 12, 2017
Online Publication Date Dec 27, 2017
Publication Date Jan 9, 2018
Deposit Date Sep 18, 2018
Publicly Available Date Dec 28, 2018
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 34
Issue 1
Pages 302-310
DOI https://doi.org/10.1021/acs.langmuir.7b03633
Public URL https://hull-repository.worktribe.com/output/502169
Publisher URL https://pubs.acs.org/doi/10.1021/acs.langmuir.7b03633

Files





You might also like



Downloadable Citations