Study On Photocatalytic Reduction Of CO (Sub2) By TPA And Its Derivatives Inexpensive Transition Metal Complexes

Using metal catalyst to catalyst the reduction of carbon dioxide has been the recent research focus of scientists. Solving the excess emissions of carbon dioxide into the air, and effectively resolving the problem which reduce carbon dioxide to carbon monoxide is one of fundamental measures to solve energy and environmental issues. We have to get rid of the past situation that people focused on the expensive metals catalysts such as ruthenium, rhenium, and other expensive metal catalysts,using the cheap and commonly seen iron, manganese, cobalt and copper as the catalytic center of metal catalysts.At the same time we introduce 3(2- pyridine methyl) amine( TPA) pyridine as the ligands, and introduced a few simple electron drawing groups into the parent TPA ligand, totally synthesized five ligands L1、L2、L3、L4、L5, based on the five kinds of ligands, synthesized complexes B1、B2、B3、B4、B5, mainly study the photo catalytic performance of them,therefore study the spectral properties and electrochemical properties of B5 complex.When using ligand PPh3, found different iron halide salts to combine with it and finally got complexes R1、R2、R3, study their photo catalytic properties, using two simple ligands Dppe and Dppm to synthesize two Fe catalysts; synthesized two simple TPA manganese complexes C1、C2, explore their photo catalytic properties and analyze the absorption spectroscopy and electro chemical performance; As for the TPA cobalt complexes, we use different inorganic metal halide salts, two cobalt TPA complexes D1、D1 were synthesized, and D3 cobalt TEOA complex is also synthesized. Study their photo catalytic properties and spectral properties; as for the copper catalyst, we compare the photo catalysis properties of E1、E2、E3, the main conclusions are as following:1.In the photoreaction, complexes B1、B2、B3、B4、B5 perfo ently, the best is TPA complex B5, in the same condition, the integral area of CO can reach16000,we optimize the reaction of B5, conclude the best condition; As for R1、R2、R3 complexes, compare their photo-catalysis properties, the best performancecome from the complex R1, the integral area of CO can reach 40000; as to the Dppe and Dppm complexes, the better is Dppe, the integral area of CO can reach 1000.2.As for C1、C2 complexes, the better catalyst is C2 complex, in the same condition, the integral area of CO can reach 2500, compared the difference between the redox potentials proved that the introduction of electronic group leads to the decrease of redox potential..3.As for cobalt complexes D1、D2、D3, study the photo catalytic properties and spectrum properties. In photo catalytic reaction, D2 makes a better performance,the integral area of CO can reach 2000,observing the UV spectrum of D1、D2,maybe connected with the space structure of TPA; As for copper complexes E1、E2、E3, catalytic properties of the three general complexes is not obvious in the reduction of carbon dioxide.