HYBRID ACID CATALYSTS PREPARED VIA TRIMETHYLSILYLATION OF
ALUMINOSILICATES SYNTHESIZED BY NON-HYDROLYTIC SOL-GEL

a 2022

HYBRID ACID CATALYSTS PREPARED VIA TRIMETHYLSILYLATION OF ALUMINOSILICATES SYNTHESIZED BY NON-HYDROLYTIC SOL-GEL

LEONOVÁ, Lucie; Aleš STÝSKALÍK; Zdeněk MORAVEC; Petr SAZAMA; Jana PASTVOVA et. al.

Základní údaje

Originální název

HYBRID ACID CATALYSTS PREPARED VIA TRIMETHYLSILYLATION OF ALUMINOSILICATES SYNTHESIZED BY NON-HYDROLYTIC SOL-GEL

Autoři

LEONOVÁ, Lucie; Aleš STÝSKALÍK; Zdeněk MORAVEC; Petr SAZAMA a Jana PASTVOVA

Vydání

SOL-GEL 2023 Conference, Lyon, France, 2022

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakt

Obor

10400 1.4 Chemical sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Organizační jednotka

Přírodovědecká fakulta

Změněno: 1. 6. 2023 19:25, Mgr. Lucie Leonová

Anotace

V originále

Hybrid materials based on aluminosilicates are extensively studied for their enhanced catalytic performance. Organic groups can change acidity, hydrothermal stability, and porosity. First, we have shown, that non-hydrolytic sol-gel (NHSG) provides highly homogeneous and porous aluminosilicate materials exhibiting superior activity and long-term stability in ethanol dehydration [1]. Second, the ethylene selectivity was improved by one pot incorporation of organic groups [2]. Interestingly, this approach did not display the direct influence of hydrophobicity on alcohol dehydration in contrary to other reports [3]. In this study, the NHSG-prepared aluminosilicate catalysts (fully inorganic) were post-synthetically modified by grafting trimethylsilyl groups onto their surfaces. Trimethylsilyl groups were attached to the surface using trimethylchlorosilane or trimethyl(methoxy)silane. The number of reacted ≡Si−OH moieties and thus the trimethylsilyl groups loading was controlled via a temperature vacuum pretreatment of aluminosilicate samples. Trimethylsilyl groups loading was evaluated by 29Si MAS NMR measurements (Figure 1). Structure, porosity, acidity, and hydrophobicity of NHSG-prepared catalysts were closely followed by MAS NMR studies, N2 physisorption, IR-pyridine analyses, and water adsorption. Moreover, aluminosilicates were tested in a gas-phase fixed-bed catalytic reactor in ethanol dehydration and in a batch reactor in aminolysis of styrene oxide (liquid phase). These tailored NHSG-prepared aluminosilicate catalysts exhibited varying catalytic activity and selectivity in both catalytic reactions depending on trimethylsilyl groups loading in the samples.

Návaznosti

GJ20-03636Y, projekt VaV

Název: Nové katalyzátory pro přípravu 1,3-butadienu z ethanolu

Investor: Grantová agentura ČR, Nové katalyzátory pro přípravu 1,3-butadienu z ethanolu

Citovat

LEONOVÁ, Lucie; Aleš STÝSKALÍK; Zdeněk MORAVEC; Petr SAZAMA a Jana PASTVOVA. HYBRID ACID CATALYSTS PREPARED VIA TRIMETHYLSILYLATION OF ALUMINOSILICATES SYNTHESIZED BY NON-HYDROLYTIC SOL-GEL. In SOL-GEL 2023 Conference, Lyon, France. 2022.

@proceedings{2287118,
   author = {Leonová, Lucie and Stýskalík, Aleš and Moravec, Zdeněk and Sazama, Petr and Pastvova, Jana},
   booktitle = {SOL-GEL 2023 Conference, Lyon, France},
   language = {eng},
   title = {HYBRID ACID CATALYSTS PREPARED VIA TRIMETHYLSILYLATION OF ALUMINOSILICATES SYNTHESIZED BY NON-HYDROLYTIC SOL-GEL},
   year = {2022}
}

TY  - CONF
ID  - 2287118
AU  - Leonová, Lucie - Stýskalík, Aleš - Moravec, Zdeněk - Sazama, Petr - Pastvova, Jana
PY  - 2022
TI  - HYBRID ACID CATALYSTS PREPARED VIA TRIMETHYLSILYLATION OF ALUMINOSILICATES SYNTHESIZED BY NON-HYDROLYTIC SOL-GEL
N2  - Hybrid materials based on aluminosilicates are extensively studied for their enhanced catalytic performance. Organic groups can change acidity, hydrothermal stability, and porosity. First, we have shown, that non-hydrolytic sol-gel (NHSG) provides highly homogeneous and porous aluminosilicate materials exhibiting superior activity and long-term stability in ethanol dehydration [1]. Second, the ethylene selectivity was improved by one pot incorporation of organic groups [2]. Interestingly, this approach did not display the direct influence of hydrophobicity on alcohol dehydration in contrary to other reports [3]. In this study, the NHSG-prepared aluminosilicate catalysts (fully inorganic) were post-synthetically modified by grafting trimethylsilyl groups onto their surfaces. Trimethylsilyl groups were attached to the surface using trimethylchlorosilane or trimethyl(methoxy)silane. The number of reacted ≡Si−OH moieties and thus the trimethylsilyl groups loading was controlled via a temperature vacuum pretreatment of aluminosilicate samples. Trimethylsilyl groups loading was evaluated by 29Si MAS NMR measurements (Figure 1). Structure, porosity, acidity, and hydrophobicity of NHSG-prepared catalysts were closely followed by MAS NMR studies, N2 physisorption, IR-pyridine analyses, and water adsorption. Moreover, aluminosilicates were tested in a gas-phase fixed-bed catalytic reactor in ethanol dehydration and in a batch reactor in aminolysis of styrene oxide (liquid phase). These tailored NHSG-prepared aluminosilicate catalysts exhibited varying catalytic activity and selectivity in both catalytic reactions depending on trimethylsilyl groups loading in the samples.
ER  -

Přehled o publikaci