Aluminum phthalocyanine complex covalently bonded to MCM-41 silica as heterogeneous catalyst for the synthesis of cyclic carbonates
Aluminum phthalocyanine complex covalently bonded to MCM-41 silica as heterogeneous catalyst for the synthesis of cyclic carbonates
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DOI：
10.1016/s1381-1169(02)00181-4
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发表时间：
2002-07-22
影响因子：
--
通讯作者：
He, R
中科院分区：
文献类型：
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作者：
Lu, XB;Wang, H;He, R
在介孔MCM-41分子筛的二氧化硅表面上，通过两种不同的途径将铝的酞菁络合物共价键合到分子筛的表面。用X射线粉末衍射仪、氮气吸附和紫外可见光谱对其进行了表征，并将其用于二氧化碳与环氧化物的环加成反应生成环状碳酸酯。在季铵盐存在下，如n-Bu4NBr的存在可显著提高催化剂的催化活性。该催化剂在反应条件下具有良好的稳定性和较高的催化活性，可重复使用10次，活性没有明显损失。并详细讨论了与n-Bu4NBr为助催化剂的固载铝络合物对环氧化物的开环和CO_2活化的催化机理。(C)2002 Elsevier Science B.V.保留所有权利。
Aluminum phthalocyanine complex was covalently bonded to the silica surface of mesoporous MCM-41 molecular sieve via two different routes. The resulting anchored complex was characterized by X-ray powder diffraction (XRD), nitrogen adsorption and UV-VIS spectroscopy, and used as catalyst for the cycloaddition of CO2 and epoxides to produce cyclic carbonates. Its catalytic activity can be markedly enhanced in the presence of a quaternary ammonium salt, such as n-Bu4NBr. The catalyst exhibits good stability as well as high catalytic activity in reaction conditions, and was subjected to utilization for 10 recycles without obvious loss of activity. The catalytic mechanism of the anchored aluminum phthalocyanine complex, combined with n-Bu4NBr as co-catalyst, for ring-opening of epoxides and activation of CO2 are also discussed in detail. (C) 2002 Elsevier Science B.V. All rights reserved.