期刊
MOLECULAR CATALYSIS
卷 545, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mcat.2023.113221
关键词
Lewis acid metals; Keggin phosphomolybdate salts; Terpene alcohols; Hydrogen hydrogen peroxide
Phosphomolybdate salts were synthesized by exchanging the protons of the phosphomolybdic acid with various metal cations. These catalysts were evaluated for their oxidation reactions of terpene alcohols using hydrogen peroxide. The physicochemical properties of the catalysts were correlated with their performance, and AlPMo12O40 was found to be the most active and selective catalyst.
In this work, phosphomolybdate salts were synthesized by exchanging the protons of the phosphomolybdic acid with metal cations (i.e., Co2+, Cu2+, Zn2+, Mn2+, Ni2+, Al3+, and Fe3+ cations) and evaluated as catalysts in oxidation reactions of terpene alcohols with hydrogen peroxide. All the catalysts were characterized by Raman, UV-Vis, and infrared spectroscopies, powder X-rays diffraction, energy dispersive spectroscopy, scanning elec-tronic microscopy, and thermal analyses. The strength of the acid sites was determined by potentiometric titration curves. Among the catalysts tested in nerol oxidation (i.e., model molecule selected), AlPMo12O40 was the most active and selective catalyst toward nerol epoxide, the main product. Main reaction variables such as the H2O2: substrate molar ratio, time, temperature, type, and catalyst load were assessed. The focus was to correlate the physicochemical properties of the catalysts with their performance. The reaction scope was extended to other terpene alcohols. Allylic alcohols (nerol and geraniol) were mainly converted to epoxides, while the oxidation of secondary (borneol) and tertiary (linalool) alcohols gave carbonylic products (camphor), or cyclization products (furane and pyrane rings), respectively.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据