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Comparison of the catalytic activity of MOFs and zeolites in Knoevenagel condensation

机译:MOF和沸石在Knoevenagel凝结中的催化活性的比较

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The catalytic behavior of metal-organic-frameworks (MOFs) CuBTC and FeBTC was investigated in Knoevenagel condensation of cyclohexane carbaldehyde and benzaldehyde with active methylene compounds and compared with zeolites BEA and TS-1. High yields were achieved over the CuBTC catalyst in the Knoevenagel condensation involving malonitrile, especially at a relatively low reaction temperature (80 °C); no leaching of the active phase was evidenced. In contrast, zeolites were not active under such reaction conditions. We propose an activation of malonitrile on a pair of adjacent Cu ions to explain the high catalytic activity of CuBTC with respect to conventional catalysts. Compared with CuBTC, zeolites exhibited usually lower selectivities, which is ascribed to a high acid strength of their active sites promoting consecutive reactions.
机译:在环己烷Carbaldehede和苯甲醛中,与活性甲基化合物的knoevenagel凝结研究了金属有机粉刺(MOFS)Cubtc和FebTC的催化行为,与Zeolites BEA和TSS-1相比。 在涉及丙诺这架的knoevenagel凝结中,在CUBTC催化剂上实现了高收率,尤其是在相对较低的反应温度(80°C)下; 没有证据表明活跃阶段的浸出。 相反,在这种反应条件下,沸石不活跃。 我们提出了在一对相邻的铜离子上激活矩阵,以解释CUBTC相对于常规催化剂的高催化活性。 与Cubtc相比,沸石通常表现出较低的选择性,这归因于其活性位点的高酸强度,促进了连续反应。

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