Comparison of Porous Iron Trimesates Basolite F300 and MIL-100(Fe) As Heterogeneous Catalysts for Lewis Acid and Oxidation Reactions: Roles of Structural Defects and Stability

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• 作者：Amarajothi Dhakshinamoorthy ; Mercedes Alvaro ; Patricia Horcajada ; Emma Gibson ; Muthusamy Vishnuvarthan ; Alexandre Vimont ; Jean-Marc Gren猫che ; Christian Serre ; Marco Daturi ; Hermenegildo Garcia
• 刊名：ACS Catalysis
• 出版年：2012
• 出版时间：October 5, 2012
• 年：2012
• 卷：2
• 期：10
• 页码：2060-2065
• 全文大小：306K
• 年卷期：v.2,no.10(October 5, 2012)
• ISSN：2155-5435

文摘

Two porous iron trimesates, namely, commercial Basolite F300 (Fe(BTC); BTC = 1,3,5-benzenetricarboxylate) with unknown structure and synthetic MIL-100(Fe) (MIL stands for Material of Institut Lavoisier) of well-defined crystalline structure, have been compared as heterogeneous catalysts for four different reactions. It was found that while for catalytic processes requiring strong Lewis acid sites, Fe(BTC) performs better, MIL-100(Fe) is the preferred catalyst for oxidation reactions. These catalytic results have been rationalized by a combined in situ infrared and ⁵⁷Fe M枚ssbauer spectroscopic characterization. It is proposed that the presence of extra Br酶nsted acid sites on the Fe(BTC) and the easier redox behavior of the MIL-100(Fe) could explain these comparative catalytic performances. The results illustrate the importance of structural defects (presence of weak Br酶nsted acid sites) and structural stability (MIL-100(Fe) is stable upon annealing at 280 掳C despite Fe³⁺-to-Fe²⁺ reduction) on the catalytic activity of these two solids, depending on the reaction type.

Keywords:

heterogeneous catalysis; metal organic frameworks; Lewis acid solids; aerobic oxidations