期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 201, 期 1-2, 页码 211-222出版社
ELSEVIER
DOI: 10.1016/S1381-1169(03)00181-X
关键词
manganese(III); porphyrin; hydrogen peroxide; monoterpenes; Y zeolite supported catalysts
Under homogeneous conditions and as a Y zeolite supported complex, manganese(III) tetra(4-N-benzylpyridyl)porphyrin (MnTBzPyP) is an active catalyst in the epoxidation of (R)-(+)-limonene and alpha-pinene, and in the hydroxylation of carvacrol and thymol, using H2O2/ammonium acetate, at room temperature and atmospheric pressure. A combined study on the characterization and catalytic performance of MnTBzPyP-NaY suggests that its preparation led to a successful inclusion of MnTBzPyP inside the zeolite during the hydrothermal synthesis. Unfortunately, irreversible catalyst deactivation occurs in the presence of H2O2. Changes in the crystalline structure of MnTBzPyP-NaY during the oxidative transformations are accompanied by leaching of the porphyrin complex to the reaction solution, accounting for the nearly complete loss of activity when the catalyst is re-used. Higher substrate conversions were achieved with the zeolite-impregnated complex. The iron analogue is inactive, under the applied reaction conditions. (C) 2003 Elsevier Science B.V. All rights reserved.
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