Synthesis and Characterisation of Hierarchically Structured Titanium Silicalite-1 Zeolites with Large Intracrystalline Macropores

0517543 - ÚFCH JH 2020 RIV DE eng J - Journal Article
Weissenberger, T. - Leonhardt, R. - Zubiri, B. A. - Pitínová-Štekrová, Martina - Sheppard, T. L. - Reiprich, B. - Bauer, J. - Dotzel, R. - Kahnth, M. - Schropp, A. - Schroer, Ch. G. - Grunwaldt, J.-D. - Casci, J. L. - Čejka, J. - Spiecker, E. - Schwieger, W.
Synthesis and Characterisation of Hierarchically Structured Titanium Silicalite-1 Zeolites with Large Intracrystalline Macropores.
Chemistry - A European Journal. Roč. 25, č. 63 (2019), s. 14430-14440. ISSN 0947-6539. E-ISSN 1521-3765
Institutional support: RVO:61388955
Keywords : ts-1 zeolites * transport-properties * catalytic performance * micro * oxidation * framework * oxide * catalysis
OECD category: Physical chemistry
Impact factor: 4.857, year: 2019
Method of publishing: Limited access

The successful synthesis of hierarchically structured titanium silicalite-1 (TS-1) with large intracrystalline macropores by steam-assisted crystallisation of mesoporous silica particles is reported. The macropore topology was imaged in 3D by using electron tomography and synchrotron radiation-based ptychographic X-ray computed tomography, revealing interconnected macropores within the crystals accounting for about 30 % of the particle volume. The study of the macropore formation mechanism revealed that the mesoporous silica particles act as a sacrificial macropore template during the synthesis. Silicon-to-titanium ratio of the macroporous TS-1 samples was successfully tuned from 100 to 44. The hierarchically structured TS-1 exhibited high activity in the liquid phase epoxidation of 2-octene with hydrogen peroxide. The hierarchically structured TS-1 surpassed a conventional nano-sized TS-1 sample in terms of alkene conversion and showed comparable selectivity to the epoxide. The flexible synthesis route described here can be used to prepare hierarchical zeolites with improved mass transport properties for other selective oxidation reactions.
Permanent Link: http://hdl.handle.net/11104/0302879