Selective Recovery and Recycling of Germanium for the Design of Sustainable Zeolite Catalysts
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F20%3A10414714" target="_blank" >RIV/00216208:11310/20:10414714 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0i608hfZnH" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=0i608hfZnH</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acssuschemeng.0c01336" target="_blank" >10.1021/acssuschemeng.0c01336</a>
Alternative languages
Result language
angličtina
Original language name
Selective Recovery and Recycling of Germanium for the Design of Sustainable Zeolite Catalysts
Original language description
Germanosilicate zeolites with extra-large-/multidimensional pore systems have a high potential for catalytic applications. However, their insufficient hydrothermal stability, high cost, and lack of strong acid sites limit their use. This work presents a synthetic approach involving post-synthesis degermanation/germanium recycling and remetalation steps for the cost-efficient preparation of Bronsted and Lewis acid zeolite catalysts. Optimization of degermanation conditions (i.e., pH and duration of the leaching treatment) allowed to recover up to 78-94% germanium from ITH, IWW, and UTL zeolites. Further metalation of hydrolyzed IWW zeolites resulted in a set of Al-, Ti-, and Sn-substituted catalysts showing enhanced activity in model acid-catalyzed reactions, such as 1-hexanol tetrahydropyranylation, 1-octene epoxidation, and Baeyer-Villiger oxidation of cyclohexanone. Noticeably, the phase selectivity of zeolite formation upon germanium recycling strongly depended on the method for parent zeolite separation from the leaching solution. In contrast to microfiltration, which produces a versatile source of germanium for the preparation of various zeolites, filtration leads to the formation of germanosilicates with the topology of the parent zeolite regardless of recycling conditions. Such a "memory effect" was rationalized based on the characterization of the germanium source and crystallization products using a combination of techniques (e.g., X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
ACS Sustainable Chemistry & Engineering
ISSN
2168-0485
e-ISSN
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Volume of the periodical
8
Issue of the periodical within the volume
22
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
8235-8246
UT code for WoS article
000541445800016
EID of the result in the Scopus database
2-s2.0-85085761923