Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach

Permanently microporous metal-organic frameworks (MOFs), a group of crystalline organic-inorganic hybrid compounds formed by organic linker and metal ions or clusters coordination, have great potential for catalysis applications due to the diverse structure and properties. The applications can be im...

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Main Author: Zhang, Nian
Other Authors: School of Materials Science and Engineering
Format: Final Year Project
Language:English
Published: 2014
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Online Access:http://hdl.handle.net/10356/55721
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-557212023-03-04T15:34:04Z Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach Zhang, Nian School of Materials Science and Engineering Huo Fengwei DRNTU::Engineering Permanently microporous metal-organic frameworks (MOFs), a group of crystalline organic-inorganic hybrid compounds formed by organic linker and metal ions or clusters coordination, have great potential for catalysis applications due to the diverse structure and properties. The applications can be improved further by incorporation various functional components (for instance, platinum (Pt) metal nanoparticles). After study and investigation done in this area on a specific case for the zirconium terephthalate UiO-66 (Zr), it is found that modulation can be used as an approach to increase the catalytic activity of UiO-66(Zr) significantly. With partial substitution of terephthalates by trifluoroacetate, using trifluoroacetic acid (TFA) and acetic acid together during the synthesis can result in a highly ordered crystalline structure. Aiming for obtaining a more open framework with more open sites, thermal treatment of the material is employed. Besides dehydroxylation of the inorganic Zr cluster, it also leads to post-synthetic removal of the trifluoroacetate groups. Here, the challenge was overcome by the incorporation of Pt nanoparticles and TFA which is aiming to create more active sites inside the MOFs without aggregation of Pt nanoparticles on the surfaces of framework. With the demonstration of the catalytic activity of UiO-66(Zr) for a series of reactions can be improved by adding TFA, it is observed that trifluoroacetate groups would replace part of the terephthalate linkers in the MOF structure synthesized, resulting in a more open structured with extra Lewis acid sites material. In addition, incorporation of Pt nanoparticles can further enhance the catalytic activity of the material as proven by the higher conversion during the experiment. Consequently, the material is a great canditate for several Lewis acid catalyzed reactions as highly active catalyst. Bachelor of Engineering (Materials Engineering) 2014-03-24T03:07:30Z 2014-03-24T03:07:30Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/55721 en Nanyang Technological University 41 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering
spellingShingle DRNTU::Engineering
Zhang, Nian
Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
description Permanently microporous metal-organic frameworks (MOFs), a group of crystalline organic-inorganic hybrid compounds formed by organic linker and metal ions or clusters coordination, have great potential for catalysis applications due to the diverse structure and properties. The applications can be improved further by incorporation various functional components (for instance, platinum (Pt) metal nanoparticles). After study and investigation done in this area on a specific case for the zirconium terephthalate UiO-66 (Zr), it is found that modulation can be used as an approach to increase the catalytic activity of UiO-66(Zr) significantly. With partial substitution of terephthalates by trifluoroacetate, using trifluoroacetic acid (TFA) and acetic acid together during the synthesis can result in a highly ordered crystalline structure. Aiming for obtaining a more open framework with more open sites, thermal treatment of the material is employed. Besides dehydroxylation of the inorganic Zr cluster, it also leads to post-synthetic removal of the trifluoroacetate groups. Here, the challenge was overcome by the incorporation of Pt nanoparticles and TFA which is aiming to create more active sites inside the MOFs without aggregation of Pt nanoparticles on the surfaces of framework. With the demonstration of the catalytic activity of UiO-66(Zr) for a series of reactions can be improved by adding TFA, it is observed that trifluoroacetate groups would replace part of the terephthalate linkers in the MOF structure synthesized, resulting in a more open structured with extra Lewis acid sites material. In addition, incorporation of Pt nanoparticles can further enhance the catalytic activity of the material as proven by the higher conversion during the experiment. Consequently, the material is a great canditate for several Lewis acid catalyzed reactions as highly active catalyst.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Zhang, Nian
format Final Year Project
author Zhang, Nian
author_sort Zhang, Nian
title Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
title_short Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
title_full Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
title_fullStr Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
title_full_unstemmed Increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
title_sort increase the catalytic activity of metal-organic frameworks by synthesis modulator approach
publishDate 2014
url http://hdl.handle.net/10356/55721
_version_ 1759856141614972928