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首页> 外文期刊>Catalysis science & technology >A single centre aluminium(in) catalyst and TBAB as an ionic organo-catalyst for the homogeneous catalytic synthesis of styrene carbonate
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A single centre aluminium(in) catalyst and TBAB as an ionic organo-catalyst for the homogeneous catalytic synthesis of styrene carbonate

机译：单个中心铝（IN）催化剂和TBAB作为离子有机催化剂，用于碳酸盐苯甲酸苯乙烯的均质催化合成

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摘要

A non-symmetrical aluminium complex containing a single metal centre has been synthesised and used as a catalyst in the cycloaddition reaction of carbon dioxide to styrene oxide to yield a cyclic carbonate. The reaction proceeds to around 70% conversion using the catalyst alone; however, it can be increased to 90% conversion with the addition of tetrabutylammonium bromide (TBAB) as a co-catalyst. Interestingly, the reaction proceeds as well with the organo-catalyst TBAB alone as it does with the aluminium catalyst alone. This offers the potential for reduced cost processing and scale-up of the reaction through elimination of the aluminium catalyst due to reduced catalyst costs and ease of separation of TBAB as a salt from the reaction mixture. The rate constants for the aluminium catalysed reactions were determined as a function of process temperature in the range 80-150 °C, as well as the activation energies for the reactions determined from the Arrhenius plots. The activation energy for the aluminium catalyst alone was determined to be 34 kJ mol~(-1), while adding TBAB as a co-catalyst reduced the activation energy by 11 kJ mol~(-1).
机译：已经合成了包含单个金属中心的非对称铝制复合物，并用作二氧化碳氧化苯乙烯氧化苯乙烯反应中的催化剂，以产生环状碳酸盐。单独使用催化剂进行反应的转化约为70％。然而，通过添加四丁基铵（TBAB）作为共催化剂，可以增加到90％的转化率。有趣的是，反应也与单独使用有机催化剂TBAB一起进行，并且仅与铝催化剂一样。由于催化剂成本降低以及将TBAB作为与反应混合物的盐分离，因此可以通过消除铝催化剂来减少成本处理和对反应的扩大的可能性。铝催化反应的速率常数是在80-150°C范围内的过程温度的函数，以及从Arrhenius图确定的反应的激活能。仅确定铝催化剂的活化能为34 kJ mol〜（-1），同时添加TBAB作为共催化剂，将活化能降低了11 kJ mol〜（-1）。

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