Prins cyclization of isoprenol with various aldehydes using MoO3/SiO2 prepared by impregnation or sol gel method as a catalyst

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F17%3A43913220" target="_blank" >RIV/60461373:22310/17:43913220 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s11144-016-1131-5" target="_blank" >http://dx.doi.org/10.1007/s11144-016-1131-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11144-016-1131-5" target="_blank" >10.1007/s11144-016-1131-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Prins cyclization of isoprenol with various aldehydes using MoO3/SiO2 prepared by impregnation or sol gel method as a catalyst

Popis výsledku v původním jazyce

MoO3/SiO2 was used a as catalyst of Prins cyclization of isoprenol with various aldehydes, isovaleraldehyde was chosen as a model substance. Two methods of catalysts preparation were applied, impregnation and sol-gel, and differences between their structure and catalytic activity were studied. Prepared catalysts were characterized by available methods (XRD, XRF, N2 adsorption, SEM and TGA). It was discovered that sol gel prepared catalyst has better dispersion of molybdenum oxide on the support and contains lower amount of crystallites of MoO3 compared to the impregnation one. Due to this fact the higher yield of desired product (substituted tetrahydropyranol) was achieved using sol-gel prepared catalyst (51 %) in comparison with the impregnation one (45 %). Influence of reaction conditions was tested and it was discovered that changing of molybdenum oxide amount in the catalyst had no effect on activity or selectivity but the increment of total catalyst amount in the reaction mixture increased the reaction rate. Water addition had positive effect on the selectivity to desired product (yield up to 60 %) but decreased the reaction rate. The prepared catalyst can be reused four times in this reaction without any loss of activity or selectivity and it can be also used in Prins cyclization of isoprenol with various aldehydes. The advantages of MoO3/SiO2 are its heterogeneous state in the reaction, simply preparation, availability and low cost of raw materials, reusability and activity, which is comparable with other heterogeneous catalysts used in this reaction before.

Název v anglickém jazyce

Prins cyclization of isoprenol with various aldehydes using MoO3/SiO2 prepared by impregnation or sol gel method as a catalyst

Popis výsledku anglicky

MoO3/SiO2 was used a as catalyst of Prins cyclization of isoprenol with various aldehydes, isovaleraldehyde was chosen as a model substance. Two methods of catalysts preparation were applied, impregnation and sol-gel, and differences between their structure and catalytic activity were studied. Prepared catalysts were characterized by available methods (XRD, XRF, N2 adsorption, SEM and TGA). It was discovered that sol gel prepared catalyst has better dispersion of molybdenum oxide on the support and contains lower amount of crystallites of MoO3 compared to the impregnation one. Due to this fact the higher yield of desired product (substituted tetrahydropyranol) was achieved using sol-gel prepared catalyst (51 %) in comparison with the impregnation one (45 %). Influence of reaction conditions was tested and it was discovered that changing of molybdenum oxide amount in the catalyst had no effect on activity or selectivity but the increment of total catalyst amount in the reaction mixture increased the reaction rate. Water addition had positive effect on the selectivity to desired product (yield up to 60 %) but decreased the reaction rate. The prepared catalyst can be reused four times in this reaction without any loss of activity or selectivity and it can be also used in Prins cyclization of isoprenol with various aldehydes. The advantages of MoO3/SiO2 are its heterogeneous state in the reaction, simply preparation, availability and low cost of raw materials, reusability and activity, which is comparable with other heterogeneous catalysts used in this reaction before.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10401 - Organic chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

REACTION KINETICS AND CATALYSIS LETTERS

ISSN

0133-1736

e-ISSN

—

Svazek periodika

121

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

83-95

Kód UT WoS článku

000401935400007

EID výsledku v databázi Scopus

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