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Unique Role of GeO2 as a Noninvasive Promoter of Nano-Sized Zeolite Crystals
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0003-4318-8990
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).ORCID iD: 0000-0001-6748-6656
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2022 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 34, no 49, article id 2205885Article in journal (Refereed) Published
Abstract [en]

The synthesis of zeolites with nano-sized dimensions is often limited to a narrow design space that conventionally relies upon the design of organics to direct hierarchical materials. Here, it is demonstrated that the addition of an inorganic modifier, germanium oxide (GeO2), to a zeolite growth mixture directs the formation of crystals with ultrasmall dimensions. This effect is observed for zeolites ZSM-11 and ZSM-5 over a range of synthesis conditions wherein the role of GeO2 in zeolite crystallization deviates from its typical function as a heteroatom. Notably, the final products contain trace amounts of Ge, which indicates the inorganic modifier does not compete for sites in the zeolite framework based on its formation of a discrete phase that enables GeO2 recovery. Catalytic tests using the methanol-to-hydrocarbons reaction reveal significant enhancement in the performance of zeolite catalysts prepared with GeO2 compared to reported examples of nano-sized zeolites. These findings highlight a potentially generalizable and commercially viable synthesis method to reduce mass-transport limitations in zeolites for diverse applications. 

Place, publisher, year, edition, pages
2022. Vol. 34, no 49, article id 2205885
Keywords [en]
catalysts, germanium oxide, nanocrystals, nonclassical crystallization, zeolites
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-212412DOI: 10.1002/adma.202205885ISI: 000873881400001Scopus ID: 2-s2.0-85141351566OAI: oai:DiVA.org:su-212412DiVA, id: diva2:1717053
Available from: 2022-12-07 Created: 2022-12-07 Last updated: 2023-01-11Bibliographically approved

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Yang, TaiminZou, Xiaodong

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