摘要
金属有机骨架化合物(MOFs)是通过过渡金属和有机配体的自组装形成的一类新型材料,具有高表面积、多孔性、孔尺寸可调等优点,在催化、分离和气体储存等方面得到广泛应用.用三种不同方法制备了金属有机骨架化合物,并用扫描电镜(SEM)、X射线衍射(XRD)和红外(IR)光谱等方法进行了表征.结果表明,用不同方法制备的MOFs表现出不同的结构和形貌,用直接混合法制备的MOFs是有效的催化碳酸二乙酯与醇酯交换制备有机碳酸酯的多相催化剂.系统地考察了反应时间、反应温度、催化剂用量和底物摩尔比对反应的影响,结果表明,碳酸二乙酯与芳香醇、脂环醇、脂肪醇和杂环醇均能以100%选择性高产率地合成有机碳酸酯,固体催化剂经简单离心分离可重复使用至少2次.
Metal organic frameworks （MOFs） are a new class of materials that are formed by the copolymerization of organic ligands with transition metals.Because of their properties such as high surface areas,microporosity,and the ability to tune pore size,many applications have recently been developed in catalysis,separation,and gas storage.We prepared MOFs by three different methods and characterized them with scanning electron microscopy （SEM）,X-ray diffraction （XRD）,and infrared （IR） spectroscopy.MOFs prepared via the three methods are completely different in morphology and microstructure.We demonstrate that the MOFs prepared via the ＂direct mixing＂ method are very effective heterogeneous catalyst for the transesterification of diethyl carbonate with alcohols to prepare organic carbonates.We studied the effects of the amount of MOFs,the reaction time,and the reaction temperature on product yield.Asymmetric organic carbonates can be produced with moderate to high yields and 100% selectivity via the reaction of diethyl carbonate with aromatic,cyclic,heterocyclic,or aliphatic alcohols.The solid catalyst can be recovered simply by centrifugation and reused for at least two cycles.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2010年第4期939-945,共7页
Acta Physico-Chimica Sinica
基金
supported by the National Natural Science Foundation of China(20932002,20733010)
National Key Basic Research Program ofChina(973)(2006CB202504)
Chinese Academy of Sciences Fund(KJCX2.YW.H16)~~
关键词
金属有机骨架化合物
配位聚合物
酯交换
碳酸二乙酯
不对称碳酸酯
Metal organic framework
Coordination polymer
Transesterification
Diethyl carbonate
Asymmetrical organic carbonate
