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Titanium incorporated hierarchical porous silicate synthesized using D4R as building blocks
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-2758-4811
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Hierarchical porous materials as catalyst have provoked great attention recent years considering that it can offer enhanced molecular diffusion and mass transfer during the reaction. Titanium containing hierarchical porous silicate material has been successfully synthesized in present work. Double-four-ring units were used as the basic building blocks to construct the desired material. Both micropores and mesopores were found in the as synthesized material. The local structure of incorporated titanium species was carefully studied using various characterization techniques, such as XPS, UV-vis, XANES and EXAFS. Tetrahedral coordinated titanium can be mostly found in the as synthesized material in this work, the distorted the local structure was further revealed by using EXAFS.

Keywords [en]
catalysis
National Category
Chemical Sciences
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-159910OAI: oai:DiVA.org:su-159910DiVA, id: diva2:1246858
Funder
Swedish Research CouncilAvailable from: 2018-09-10 Created: 2018-09-10 Last updated: 2020-02-06Bibliographically approved
In thesis
1. Synthesis, characterization and applications of hierarchical porous inorganic materials: a multi-dimensional approach
Open this publication in new window or tab >>Synthesis, characterization and applications of hierarchical porous inorganic materials: a multi-dimensional approach
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Zeolites are a type of microporous crystalline materials that have been widely used in industrial applications including separation, adsorption, and catalysis. However, great limitations on diffusion through these materials can arise due to the small pores present in mircoporous frameworks, and this can impact catalytic reactions in particular. The synthesis of hierarchical zeolites has solved the diffusion problem. In this thesis, various hierarchically porous materials have been synthesized and tested as catalysts.

In the first part of this thesis, a titanium-containing hierarchically porous silicate material has been constructed from double-four-ring (D4R) units as building blocks.

In the second part of this thesis, hierarchical MWW zeolites were synthesized by swelling and pillaring of a lamellar MWW zeolitic precursor (MCM-22) using D4R building units. The synthesis procedure has been carefully studied by various characterization methods, such as PXRD, TEM, N2 adsorption–desorption etc.

In the last part of this thesis, MFI zeolites with controllable hierarchical pore systems have been prepared. Firstly, hierarchical ZSM-5 and TS-1 with open pores were generated using a temperature programmed dissolution–recrystallization post-synthesis treatment and tested as catalysts for benzyl alcohol self-etherification and cyclohexanone ammoximation. Secondly, single-crystalline hierarchical shell-like ZSM-5 has been synthesized via a dissolution–recrystallization post-treatment of mesoporous ZSM-5. The post-treatment increased the catalytic activity of the ZSM-5 zeolite for the aldol condensation of bulky substrates.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry, Stockholm University, 2018. p. 96
Keywords
Zeolites, Porous material, Hierarchical, Synthesis, Catalysis, MFI zeolite, MWW zeolite, ZSM-5, TS-1
National Category
Chemical Sciences
Research subject
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-159912 (URN)978-91-7797-444-4 (ISBN)978-91-7797-445-1 (ISBN)
Public defence
2018-10-24, Magnélisalen, Kemiska övningslaboratoriet Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Manuscript. Paper 2: Manuscript. Paper 4. Accepted.

Available from: 2018-10-01 Created: 2018-09-10 Last updated: 2020-05-11Bibliographically approved

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