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Regeneration of Deactivated Hollow Titanium Silicalite Zeolite from Commercial Ammoximation Process by Encapsulating Amorphous TiO2-SiO2 Nanoparticles inside Zeolite Crystal
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Research Institute of Petroleum Processing, SINOPEC, Beijing P. R. China.
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Number of Authors: 6
2016 (English)In: ChemistrySelect, ISSN 2365-6549, Vol. 1, no 14, 4187-4192 p.Article in journal (Refereed) Published
Abstract [en]

An efficient regeneration method to encapsulate the poisonous amorphous TiO2-SiO2 nanoparticles within zeolite crystal via post-synthesis has been developed. It is demonstrated that the encapsulation of Ti-rich nanoparticles can reduce the accessibility of H2O2 molecules to acid sites of Ti-rich nanoparticles, thus lowering the inefficient decomposition of H2O2 oxidant during catalytic reactions. Furthermore, the regenerated HTS zeolite is of smaller particle size than conventional TS-1 zeolite due to the existence of deactivated HTS as crystal seed during hydrothermal synthesis. Consequently, the regenerated HTS zeolite shows as high catalytic performance as fresh TS-1 zeolite in phenol hydroxylation reaction with 30 wt% H2O2 aqueous solution as oxidant. Importantly, this study exploits a novel concept on updating the lifetime of industrial zeolite catalyst, which is of both academic and practical significance.

Place, publisher, year, edition, pages
2016. Vol. 1, no 14, 4187-4192 p.
Keyword [en]
Regeneration, Hollow titanium silicate, Encapsulation, Dissolution-recrystallization, Ammoximation
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-142429DOI: 10.1002/slct.201600283ISI: 000395422000006OAI: oai:DiVA.org:su-142429DiVA: diva2:1092414
Available from: 2017-05-02 Created: 2017-05-02 Last updated: 2017-05-02Bibliographically approved

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