期刊
RESEARCH ON CHEMICAL INTERMEDIATES
卷 46, 期 9, 页码 4047-4059出版社
SPRINGER
DOI: 10.1007/s11164-020-04190-z
关键词
Isopulegol; Tungsten oxide-modified silica; Intramolecular Prins reaction; Citronellal
Several types of mixed WO3/SiO2/Al(2)O(3)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 usingX-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 degrees 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 degrees C). Possibility of catalyst reuse was confirmed.
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