Jiao, Yilai, Adedigba, Abdul-Lateef, Dummer, Nicholas F. ORCID: https://orcid.org/0000-0002-0946-6304, Liu, Jinmin, Zhou, Yangtao, Guan, Yanan, Shen, Hengyu, Perdjon, Micheal ORCID: https://orcid.org/0000-0002-0224-1647 and Hutchings, Graham J. ORCID: https://orcid.org/0000-0001-8885-1560 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 |
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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: | 02 Nov 2024 16:50 |
URI: | https://orca.cardiff.ac.uk/id/eprint/133130 |
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