Homogeneous molybdenum silicate microspheres and their application as heterogeneous epoxidation catalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F22%3A63560539" target="_blank" >RIV/70883521:28610/22:63560539 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Homogeneous molybdenum silicate microspheres and their application as heterogeneous epoxidation catalysts

Popis výsledku v původním jazyce

ln recent years, an increasing effort of researchers has been focused on the development of environmentally friendly processes in industrial and materials chemistry. Therefore, an application of novel and advanced heterogeneous reusable catalysts, easily separable from the reaction mixture, has attracted a great interest as they can contribute to the waste minimization and facilitation of industrial processes [1]. Herein, we introduce a fast and simple non-aqueous approach for a preparation of homogeneous molybdenum silicate microspheres [2]. The synthesis is based on a microwave-assisted preparation of molybdenum metal-organic framework (Mo-Bpdc) solution serving as a molybdenum precursor that is subsequently mixed with (3-Aminopropyl)triethoxysilane (APTES), resulting in the precipitation of microspheres (Mo-Bpdc-APTES). ln contrast to conventional impregnation methods, there is no need to prepare silica support separately. lnstead, the homogeneous molybdenum silicate material is obtained via one-step condensation upon the elimination of the ethanol byproduct. After the calcination of as-prepared microspheres, porous and amorphous molybdenum silicate spheres with homogeneous Mo distribution are obtained. To investigate the catalytic properties, molybdenum-silicate spheres were used as heterogeneous catalysts for the epoxidation of cyclohexene. High conversion and selectivity to cyclohexene oxide were observed. Moreover, a significant catalytic activity in the selective oxidation of aniline to nitrosobenzene was achieved. The presence of both Lewis and Bronsted acidic sites was confirmed. Hence, the heterogeneous molybdenum-silicate microsphere catalyst is promising for a wide range of catalytic reactions.

Název v anglickém jazyce

Homogeneous molybdenum silicate microspheres and their application as heterogeneous epoxidation catalysts

Popis výsledku anglicky

ln recent years, an increasing effort of researchers has been focused on the development of environmentally friendly processes in industrial and materials chemistry. Therefore, an application of novel and advanced heterogeneous reusable catalysts, easily separable from the reaction mixture, has attracted a great interest as they can contribute to the waste minimization and facilitation of industrial processes [1]. Herein, we introduce a fast and simple non-aqueous approach for a preparation of homogeneous molybdenum silicate microspheres [2]. The synthesis is based on a microwave-assisted preparation of molybdenum metal-organic framework (Mo-Bpdc) solution serving as a molybdenum precursor that is subsequently mixed with (3-Aminopropyl)triethoxysilane (APTES), resulting in the precipitation of microspheres (Mo-Bpdc-APTES). ln contrast to conventional impregnation methods, there is no need to prepare silica support separately. lnstead, the homogeneous molybdenum silicate material is obtained via one-step condensation upon the elimination of the ethanol byproduct. After the calcination of as-prepared microspheres, porous and amorphous molybdenum silicate spheres with homogeneous Mo distribution are obtained. To investigate the catalytic properties, molybdenum-silicate spheres were used as heterogeneous catalysts for the epoxidation of cyclohexene. High conversion and selectivity to cyclohexene oxide were observed. Moreover, a significant catalytic activity in the selective oxidation of aniline to nitrosobenzene was achieved. The presence of both Lewis and Bronsted acidic sites was confirmed. Hence, the heterogeneous molybdenum-silicate microsphere catalyst is promising for a wide range of catalytic reactions.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/EF16_028%2F0006243" target="_blank" >EF16_028/0006243: Rozvoj kapacit pro výzkum a vývoj UTB ve Zlíně</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů