Tungsten oxide-based materials as effective catalysts in isopulegol formation by intramolecular Prins reaction of citronellal

Autor:	Eva Vrbková, Martin Zapletal, Libor Červený, Eliška Vyskočilová, Barbora Šteflová
Rok vydání:	2020
Předmět:	010405 organic chemistry Thermal desorption spectroscopy Chemistry General Chemistry Prins reaction 010402 general chemistry 01 natural sciences Fluorescence spectroscopy 0104 chemical sciences Catalysis chemistry.chemical_compound Intramolecular force Pyridine Citronellal Selectivity Nuclear chemistry
Zdroj:	Research on Chemical Intermediates. 46:4047-4059
ISSN:	1568-5675 0922-6168
DOI:	10.1007/s11164-020-04190-z
Popis:	Several types of mixed WO3/SiO2/Al2O3 materials were prepared using sol–gel and wet impregnation methods. Four different loadings of WO3 (1, 10, 25 and 40 wt%) were prepared. Materials were characterized using X-ray diffraction, X-ray fluorescence spectroscopy, and their acidity was measured by temperature programmed desorption of pyridine. Catalytic activity of these materials was tested in Prins reaction—intramolecular cyclization of citronellal. Influence of reaction conditions (temperature 70–90 °C, catalyst amount 1–10 wt%, catalyst type) on citronellal conversion and selectivity of isopulegol formation was monitored. The best result (90% of isopulegol, 97% selectivity of isopulegol formation, 24 h) was obtained using W25 IMP catalyst (10 wt%, 50 °C). Possibility of catalyst reuse was confirmed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::613dbe9e455cf7fad13de03c13dc6bbd https://doi.org/10.1007/s11164-020-04190-z Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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