A lanthanide MOF catalyst with an excellent thermal stability for the synthesis of polycarbonate diol

摘要

A lanthanide metal-organic framework (MOF) Yb(BTC)(H2O)center dot(DMF) (BTC = 1,3,5-benzenetricarboxylate, DMF = N,N-dimethylformamide) was prepared from Yb(NO3)(3)center dot 5H(2)O and H3BTC using the solvothermal method and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, N-2 adsorption-desorption technology, and temperature-programmed desorption. The results show that Yb(BTC)(H2O)center dot(DMF) is a lanthanide MOF with an excellent thermal stability. The coordinated water molecules and DMF guest molecules were removed from the channels by calcination to form a porous solid Yb (BTC) with coordinatively unsaturated Yb3+ sites. The BET surface area and pore size of Yb(BTC) are 695 m(2)/g and 0.68 nm, respectively. As a heterogeneous Lewis acid catalyst, the activity of Yb(BTC) for the synthesis of polycarbonate diol (PCDL) via transesterification between diphenyl carbonate and diol was investigated. Compared with nine reported catalysts, Yb(BTC) exhibits the highest catalytic activity for the synthesis of PCDL.