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Synthesis, Structure Characterization And Catalyst Capability Of New Metal-Organic Frameworks

Posted on:2006-07-03Degree:DoctorType:Dissertation
Country:ChinaCandidate:W Y WeiFull Text:PDF
GTID:1101360212989345Subject:Chemical processes
Abstract/Summary:PDF Full Text Request
Metal Organic Frameworks (MOFs, namely coordination polymer) are a new type of solid material, which have an extensive application prospect. In this paper, synthesis, characterization of structure, factors effecting on structure and coordination patterns of ligand, and application in catalyst were researched.In the first part, the new structure MOFs were synthesized through the following three ways:(1) Four kinds of coordination polymers which ligand was aromatic carboxylic acid H3BTC (1, 3, 5-benzentricarboxylic acid) were synthesized by hydrothermal method and evaporated crystallization method: [Cu3(OH)3BTC]n (1), Co3(BTC)2·12H2O (2), [Cu(H2O)3(HBTC)]n (3) and Co3Na(OH) (BTC)2 (H2O)11·1.5H2O (4), where the coordination numbers of Co2+and Na+ are six, the coordination numbers of Cu2+ are five and four.(2) When H3BTC, H2BDC (terephthalic acid), 1,2-BDC (1,2-benzendicarboxylic acid), FURM (fumaric acid) and 4,4′-bipy (4,4′-bipyridine), 2,2′-bipy (2,2′-bipyridine), Phen (1,10-Phenanthroline), and PRZ (piperazine) being ligands, seven coordination polymers were synthesized by hydrothermal method: La(BDC)1.5(H2O) (Phen)·H2O·DMF(5), [Co(4,4′-bipy)(H2O)4]·[FUMA]·4H2O (6), Co(H2BTC)2(Phen) (7), [Mn(4,4′-bipy)(H2O)4]·(BDC) (8), [Mn (2,2′-bipy) (BDC) (H2O)](9), [Mn (4, 4′-bipy)(1,2-BDC)(2H2O)]·2H2O(10) and Co3 (BTC)2 (Phen)2 (H2O)10·CH3OH·2H2O (11), where the coordination number of La3+ is eight, and the coordination numbers of Co2+ and Mn2+ are six.(3) When PRZ being the template and aromatic carboxylic acid H3BTC being the ligand, three porous coordination polymer were synthesized by hydrothermal method: [Ni2(BTC)2(H2O)6](C4H12N2)·2H2O (12), [ZnCo(BTC)2(H2O)6](C4H12N2)·2H2O (13) and [Co(BTC) (H2O)3](C4H12N2)0.5·H2O (14), where the coordination numbers of Ni2+, Co2+ and Zn2+ are six.Structure and thermal stabilization of the fourteen kinds of coordination polymers were characterized by many kinds of analysis methods, such as infrared spectra, element analysis, X-ray single crystal diffraction and thermal gravity analysis. The results show that these coordination polymers including hydrogen bonds arethree-dimensional and steady at room temperature.In the second part, the factor which effect on the structure of coordination polymers and coordination patterns of ligands were analyzed: Different systems, such as Ni-Co-BTC- PRZ, Cu-BTC, Co-BTC and Co-BTC-Phen, were selected, and the effects of different reaction condition including temperature, pH value, mole ratio of reactants, fullness ratio, competitive ligand and cation were researched. The result shows that these factors have different effect on different system. The system of Ni-Co-BTC- PRZ is serious affected by temperature, mole ratio of reactants and competitive ligand. The pH value and fullness ratio are significant for the system of Cu-BTC, but the pH value has no effect on the system of Co-BTC. The system of Co-BTC-Phen is greatly affected by cation.In the last part, two coordination polymers, Y-BDC and La-BDC-PRZ, were synthesized by hydrothermal method. When they were used as catalysts in the synthesis of Methyl Ethyl Carbonate by dimethyl carbonate and diethyl carbonate, the reaction yields were 8.62% and 3.21% respectively. The result shows that the two coordination polymers have obvious catalyzing functions compared with the control experiment.
Keywords/Search Tags:metal-organic frameworks, synthesis, structure characterization, catalyst, porous material
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