Porous Metal-Organic Framework Materials: Microwave Assisted Synthesis and Oxidative Catalytic Tests
Metal-Organic Framework Materials MIL‑101(Cr) ([Cr3X(H2O)2O(bdc)3]∙n(H2O), where X− = F− or OH−, n ≈ 25 and H2bdc stands for 1,4-benzene-dicarboxylic acid] and MOF‑5(Zn) [Zn4O(bdc)3] were prepared by hydrothermal or solvothermal methods as well as Microwave‑Assisted Synthesis (MWAS), for which the detailed synthetic parameters were optimized. The crystal structures were confirmed by powder X-ray diffraction and the materials were further characterized by FT‑IR absorption spectroscopy. MIL‑101(Cr) and MOF‑5(Zn) showed weak catalytic activity in the oxidation of terpene, thiophene and cis-cyclooctene. Reasonable catalytic activity was observed for MOF-5(Zn) in the epoxidation of cis-cyclooctene and a 100 % of selectivity was observed for the epoxide. The structural stability of the materials was tested under the employed catalytic medium for oxidation reactions. MOF-5(Zn) revealed a remarkable structural stability at high temperature and also in the presence of high oxidant amounts.
Ana Maria Pires Pinto and António Sérgio Pouzada
A. D.S. Barbosa et al., "Porous Metal-Organic Framework Materials: Microwave Assisted Synthesis and Oxidative Catalytic Tests", Materials Science Forum, Vols. 730-732, pp. 1024-1029, 2013