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The effect of T-atom ratio and TPAOH concentration on the pore structure and titanium position in MFI-Type titanosilicate during dissolution-recrystallization process

Jiao, Yilai, Adedigba, Abdul-Lateef, Dummer, Nicholas F., Liu, Jinmin, Zhou, Yangtao, Guan, Yanan, Shen, Hengyu, Perdjon, Micheal and Hutchings, Graham J. 2020. The effect of T-atom ratio and TPAOH concentration on the pore structure and titanium position in MFI-Type titanosilicate during dissolution-recrystallization process. Microporous and Mesoporous Materials 305 , 110397. 10.1016/j.micromeso.2020.110397
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Abstract

In this work, titanosilicate MFI (TS-1) crystals with different Si/Ti ratio were treated with tetrapropylamonium hydroxide (TPAOH) solution of different concentrations. The results showed that the properties – crystal structure, titanium position, secondary pore structure and volume – of the treated samples strongly depend on the Si/Ti ratio of the parent TS-1 sample and the TPAOH concentration. For instance, high TPAOH concentration is necessary to induce titanium re-insertion into framework position and to create inter-connected open meso/macropore in TS-1 with low Si/Ti ratio. On the contrary, TPAOH treatment even at high concentration was found to be ineffective in the post-synthesis treatment of low titanium containing TS-1 samples and result in a phase change from orthorhombic to monoclinic. The post-treated high titanium containing and inter-connected secondary pore TS-1 samples exhibited higher activity for cyclohexene epoxidation than the parent TS-1 sample with similar Si/Ti. This technique provides a controlled way of mesopore creation in TS-1 materials, which may be extended to other titanium base microporous materials.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 1387-1811
Funders: Natural Science Foundation of Liaoning Province and the China Scholarship Council
Date of First Compliant Deposit: 6 July 2020
Date of Acceptance: 11 June 2020
Last Modified: 31 Aug 2020 16:40
URI: http://orca.cf.ac.uk/id/eprint/133130

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