Molybdenum silicate microspheres prepared via a combined condensation approach and their catalytic activity in propylene metathesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F25%3A63592038" target="_blank" >RIV/70883521:28610/25:63592038 - 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

Molybdenum silicate microspheres prepared via a combined condensation approach and their catalytic activity in propylene metathesis

Popis výsledku v původním jazyce

Olefin metathesis is a versatile reaction involving the rearrangement of C=C bonds used in various applications, ranging from the synthesis of fine chemicals to the large-scale production of petroleum products. ln this study, we present molybdenum silicate microspheres as heterogeneous catalysts for propylene metathesis. These microspheres are synthesized through a combined approach based on microwave-assisted heating followed by a condensation reaction. Microwave-assisted reaction involving bis(acetylacetonato)dioxomolybdenum(VI) and biphenyl-4,4&apos;-dicarboxylic acid, forming a hybrid molybdenum biphenyl dicarboxylate precursor. This precursoris then mixed with (3-Aminopropyl)triethoxysilane and this condensation step produces hybrid molybdenum silicate solids. After their calcination at 500 •c in an air atmosphere, the resulting amorphous and porous Mo SiO2 microspheres containing highly dispersed molybdate species are obtained.1 2 The physical properties ofthese microspheres were analyzed using electron microscopy, and nitrogen adsorption isotherms, X-ray photoelectron spectroscopy, 29Si solid-state NMR. ln-sítu ultraviolet-visible diffuse reflectance spectroscopy and time-of-flight secondary ion mass spectrometry revealed that these catalysts have homogeneously dispersed MoOx species, which exhibit high catalytic activity in heterogeneous propylene metathesis. Compared to traditional silica-supported MoOx catalysts prepared by the incipient wetness impregnation method, the MoSiO2 microspheres demonstrated nearly two orders of magnitude higher steady-state propylene metathesis rates, reaching values as high as 4.11 x 10-5 mol g-1 s-1.

Název v anglickém jazyce

Molybdenum silicate microspheres prepared via a combined condensation approach and their catalytic activity in propylene metathesis

Popis výsledku anglicky

Olefin metathesis is a versatile reaction involving the rearrangement of C=C bonds used in various applications, ranging from the synthesis of fine chemicals to the large-scale production of petroleum products. ln this study, we present molybdenum silicate microspheres as heterogeneous catalysts for propylene metathesis. These microspheres are synthesized through a combined approach based on microwave-assisted heating followed by a condensation reaction. Microwave-assisted reaction involving bis(acetylacetonato)dioxomolybdenum(VI) and biphenyl-4,4&apos;-dicarboxylic acid, forming a hybrid molybdenum biphenyl dicarboxylate precursor. This precursoris then mixed with (3-Aminopropyl)triethoxysilane and this condensation step produces hybrid molybdenum silicate solids. After their calcination at 500 •c in an air atmosphere, the resulting amorphous and porous Mo SiO2 microspheres containing highly dispersed molybdate species are obtained.1 2 The physical properties ofthese microspheres were analyzed using electron microscopy, and nitrogen adsorption isotherms, X-ray photoelectron spectroscopy, 29Si solid-state NMR. ln-sítu ultraviolet-visible diffuse reflectance spectroscopy and time-of-flight secondary ion mass spectrometry revealed that these catalysts have homogeneously dispersed MoOx species, which exhibit high catalytic activity in heterogeneous propylene metathesis. Compared to traditional silica-supported MoOx catalysts prepared by the incipient wetness impregnation method, the MoSiO2 microspheres demonstrated nearly two orders of magnitude higher steady-state propylene metathesis rates, reaching values as high as 4.11 x 10-5 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)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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