【摘要】 具有纳米孔洞的金属-有机骨架材料Cu3(BTC)2(H2O)3为催化剂,过氧化氢为氧化剂,利用紫外可见光谱研究其催化氧化苯甲醇生成苯甲醛的催化反应动力学行为,系统地讨论了纳米孔洞金属-有机骨架材料的催化动力学。研究结果表明,随着反应介质的pH、催化剂与反应底物的摩尔比和反应温度的升高,准一级反应速率常数kobsd也会随之增大。根据所得实验结果,讨论了催化氧化反应动力学机理,建立了催化反应动力学模型。基于所建立的动力学模型和准一级反应速率常数kobsd,计算了催化反应的活化能Ea,催化剂与底物间的吸脱附平衡常数KS以及该反应在催化剂催化内表面生成产物的表观一级速率常数kN。更多还原

【Abstract】 Kinetics of oxidation of benzyl alcohol catalyzed by nanoporous metal-organic frameworks Cu3(BTC)2(H2O)3was studied using UV-Vis spectral method.It was found that the apparent first-order rate constant increased remarkably with the increasing of pH,molar ratio of the catalyst to the substrate and reaction temperature.Based on the experimental results,catalysis mechanism for the catalytic oxidation was discussed,and a kinetic model was proposed.The apparent activation energy(Ea),association equilibrium constant between the catalyst and the substrate(KS),and apparent first-order rate constants of the catalytic reaction taking place on the surface of channels in the framework(kN) for each reaction have been calculated.更多还原