Non-aqueous Sol-Gel Synthesis of Molybdenum Silicate and Aluminosilicate Xerogel Catalysts for Propylene Metathesis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F25%3A63598318" target="_blank" >RIV/70883521:28610/25:63598318 - 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

Non-aqueous Sol-Gel Synthesis of Molybdenum Silicate and Aluminosilicate Xerogel Catalysts for Propylene Metathesis

Popis výsledku v původním jazyce

Novel molybdenum silicate and aluminosilicate xerogels were synthesized using a methodthat combines microwave-assisted (MWA) heating with non-hydrolytic sol-gel condensation.During the MWA heating, a hybrid Mo-based precursor solution was formed and then mixedwith bis(triethoxysilylpropyl)amine to produce a silica-based catalyst. For the aluminosilicatecatalyst, the Mo precursor solution was combined with an aluminosilicate sol made by thetemplated acetamide elimination reaction [1]. After solvent evaporation, orange-browntransparent gels were obtained. Calcination at 500 °C in air resulted in microporous Mo-SiO₂and mesoporous Mo-SiO₂/Al₂O₃ xerogels. The Mo-SiO₂ catalyst contained about 3.1 wt.%Mo with a surface area of 512 m² g⁻¹, while the Mo-SiO₂/Al₂O₃ xerogel had approx. 3.4 wt.%Mo and a surface area of 380 m² g⁻¹. Raman, ToF-SIMS, DRUV-Vis, and STEM-EDS (seethe figure) confirmed the uniform dispersion of predominantly isolated Mo di-oxo species. Inpropene metathesis, the Mo-SiO₂ and Mo-SiO₂/Al₂O₃ catalysts achieved steady-statereaction rates of 1.53 × 10⁵ mol g⁻¹ s⁻¹ and 1.23 × 10⁵ mol g⁻¹ s⁻¹, respectively. Themicroporous Mo-SiO₂ xerogel exhibited magnitude higher steady-state activity in metathesisat 200 °C compared to the MoO₃/SiO₂ catalyst prepared via incipient wetness impregnation.

Název v anglickém jazyce

Non-aqueous Sol-Gel Synthesis of Molybdenum Silicate and Aluminosilicate Xerogel Catalysts for Propylene Metathesis

Popis výsledku anglicky

Novel molybdenum silicate and aluminosilicate xerogels were synthesized using a methodthat combines microwave-assisted (MWA) heating with non-hydrolytic sol-gel condensation.During the MWA heating, a hybrid Mo-based precursor solution was formed and then mixedwith bis(triethoxysilylpropyl)amine to produce a silica-based catalyst. For the aluminosilicatecatalyst, the Mo precursor solution was combined with an aluminosilicate sol made by thetemplated acetamide elimination reaction [1]. After solvent evaporation, orange-browntransparent gels were obtained. Calcination at 500 °C in air resulted in microporous Mo-SiO₂and mesoporous Mo-SiO₂/Al₂O₃ xerogels. The Mo-SiO₂ catalyst contained about 3.1 wt.%Mo with a surface area of 512 m² g⁻¹, while the Mo-SiO₂/Al₂O₃ xerogel had approx. 3.4 wt.%Mo and a surface area of 380 m² g⁻¹. Raman, ToF-SIMS, DRUV-Vis, and STEM-EDS (seethe figure) confirmed the uniform dispersion of predominantly isolated Mo di-oxo species. Inpropene metathesis, the Mo-SiO₂ and Mo-SiO₂/Al₂O₃ catalysts achieved steady-statereaction rates of 1.53 × 10⁵ mol g⁻¹ s⁻¹ and 1.23 × 10⁵ mol g⁻¹ s⁻¹, respectively. Themicroporous Mo-SiO₂ xerogel exhibited magnitude higher steady-state activity in metathesisat 200 °C compared to the MoO₃/SiO₂ catalyst prepared via incipient wetness impregnation.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10402 - Inorganic and nuclear 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

2025

Kód důvěrnosti údajů

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