Microwave-Assisted Sol-Gel Synthesis of Molybdenum Silicate Microspheres and their Catalytic Activitiy in Propylene Metathesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F24%3A63589018" target="_blank" >RIV/70883521:28610/24:63589018 - 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

Microwave-Assisted Sol-Gel Synthesis of Molybdenum Silicate Microspheres and their Catalytic Activitiy in Propylene Metathesis

Popis výsledku v původním jazyce

Olefin metathesis is a versatile strategy that is used in numerous applications, from the synthesis of fine chemicals to the large-scale production of petroleum commodities. In this work, we introduce molybdenum silicate microspheres as heterogeneous catalysts for propylene metathesis. The synthesis of molybdenum silicate microspheres is based on a microwave-assisted reaction of bis( acetylacetonato )dioxomolybdenum(VI) and biphenyl-4,4&apos;-dicarboxylic acid that provides hybrid molybdenum biphenyl dicarboxylate-based precursor and its subsequent condensation with (3-Aminopropyl)triethoxysilane.1,2 After the calcination of as-prepared hybrid metallosilicate products at 500 °C under air atmosphere amorphous and porous Mo-SiO2 microspheres with highly dispersed molybdate species were obtained. The physical properties of the synthesized microspheres were characterized with X-ray photoelectron spectroscopy, 29Si solid-state NMR, electron microscopy, and nitrogen adsorption isotherms. Results from in-situ ultraviolet-visible diffuse reflectance spectroscopy and time-of-flight secondary ion mass spectrometry revealed that these catalysts contain homogeneously dispersed MoOx species, which possess high catalytic activity in heterogeneous propylene metathesis.2 Compared to conventional silicasupported MoOx catalysts prepared via the incipient wetness impregnation method, the Mo-SiO2 microspheres exhibited nearly two orders of magnitude higher steady-state propylene metathesis rates, which reached values as high as 4.11 • l 0-5 mol g-1 s-1.

Název v anglickém jazyce

Microwave-Assisted Sol-Gel Synthesis of Molybdenum Silicate Microspheres and their Catalytic Activitiy in Propylene Metathesis

Popis výsledku anglicky

Olefin metathesis is a versatile strategy that is used in numerous applications, from the synthesis of fine chemicals to the large-scale production of petroleum commodities. In this work, we introduce molybdenum silicate microspheres as heterogeneous catalysts for propylene metathesis. The synthesis of molybdenum silicate microspheres is based on a microwave-assisted reaction of bis( acetylacetonato )dioxomolybdenum(VI) and biphenyl-4,4&apos;-dicarboxylic acid that provides hybrid molybdenum biphenyl dicarboxylate-based precursor and its subsequent condensation with (3-Aminopropyl)triethoxysilane.1,2 After the calcination of as-prepared hybrid metallosilicate products at 500 °C under air atmosphere amorphous and porous Mo-SiO2 microspheres with highly dispersed molybdate species were obtained. The physical properties of the synthesized microspheres were characterized with X-ray photoelectron spectroscopy, 29Si solid-state NMR, electron microscopy, and nitrogen adsorption isotherms. Results from in-situ ultraviolet-visible diffuse reflectance spectroscopy and time-of-flight secondary ion mass spectrometry revealed that these catalysts contain homogeneously dispersed MoOx species, which possess high catalytic activity in heterogeneous propylene metathesis.2 Compared to conventional silicasupported MoOx catalysts prepared via the incipient wetness impregnation method, the Mo-SiO2 microspheres exhibited nearly two orders of magnitude higher steady-state propylene metathesis rates, which reached values as high as 4.11 • l 0-5 mol g-1 s-1.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/LUAUS23085" target="_blank" >LUAUS23085: Syntéza nových vysoce aktivních metalosilikátových katalyzátorů pro metatezi olefinů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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