The Controllable Fabrication And Research Of SDB-based Hydrophobic Catalysts

With the rapid development of human society, the requirement for energy is also increasing. The use of traditional energy makes a lot of pollution to environment, and the amount of traditional energy is less and less. The countries all over the world focus on nuclear energy, which is clean and efficient. However, with the employ of nuclear energy, nuclear power plants and nuclear fuel reprocessing plants in service produce a large amount of tritiated water every year. Tritiated water must be treated basing on the radiation and value of tritium.In the method of handling tritiated water, liquid phase catalytic exchange (LPCE) is the most effective process. But LPCE process requires the hydrophobic catalysts, conventional catalysts lose their activity since of mental active center cannot contact with reactants in the present of liquid water. The synthesis of hydrophobic catalysts has been widely studied by researcher all over the world. SDB-based catalyst is one of the most useful hydrophobic catalysts kinds with good performance. The styrene-divinylbenzene copolymer (SDB) is used as hydrophobic support. SDB has excellent pore structure, structural strength and radiation resistance.The preparation methods of SDB-based hydrophobic catalysts are more and more mature after several years’developing. Usually, SDB hydrophobic supports are made using suspension polymerization firstly, and then Pt particles are loaded on the SDB supports using impregnation method. But the SDB beads made by suspension polymerization method have a wide size spread and they need to be screened before application, which is lack of economy. On the other hand, Pt particles are easily to be accumulated applying impregnation method which has a low availability.To overcome these weak points, this article employed a new way to prepare SDB-based hydrophobic catalysts. We applied microfluidic technology in the synthesis of the hydrophobic catalysts innovatively and researched the methods to load the Pt nanoparticles on the hydrophobic supports after Pt nanoparticles were prepared by y-ray-induced reduction. The main points of this article can be summarized as follows:1. A capillary-based microfluidic system was designed and assembled to prepare hydrophobic supports and hydrophobic catalysts. 2. We researched about how to make the cross-linking reaction of styrene and divinylbenzene occur rapidly. TPGDA and HCPK were added to them and UV-light was applied, which made the cross-linking copolymerization accomplish in10minutes. At last, we obtained the hydrophobic supports poly(SDB-TPGDA).3. H2PtC16·6H2O was used as the Pt precursor, y-ray-induced reduction was used to produce uniform-dispersed platinum nanoparticles in the water phase. After surface modification, Pt nanoparticles were dispersed in the mixed co-monomer which was organic phase. The mixed liquid was used as dispersed phase for microfluidic system. TEM was applied to observe the dispersion of Pt nanoparticles in both water phase and organic phase.4. Using microfluidic system and direct-dripped-droplets methods respectively, minor and superior size of hydrophobic catalysts beads were prepared. SEM, TEM, BET, XRD and XPS were used to analyze the performance of them.