纳米金属催化剂的制备方法开题报告.ppt

The preparation methods of metal nanocatalysts Introduction Useful Efficient Important Nothing can help Br Fe coming Br Meet + Fe Catalyst FeBr3 Enzyme Heterogeneous Homogeneous Metal nanocatalysts Green Chem, 2012,14, 111-116 …… Metal nanocatalysts Dealloying process Gas phase method Liquid phase method …… Preparation?methods? Higher surface-to-volume ratio More active surface atoms H2 Dealloying process Xu Y, et al. Nanotechnology, 2014, 25(44): 445602. Nanosphere Nanowire Sponge-like Nanoporous Gold sphere AuGe film Au/Ge eutectic melt Au/Ge droplets 550℃ evaporate SiO2substrate dewetting solification dealloying nanoporous single crystals of gold Khristosov M K, et al. Nature communications, 2015, 6. Nanoporous Pt–Fe Alloy Nanowires Shui J, et al. Adv. Fun. Mater, 2011, 21(17): 3357-3362. Electrospinning Dealloying Nanoporous Gold films 65:35 (at%) Ag/Au sheets Room temperature Nitric acid Nanoporous gold (NPG) Zhang L, et al. Adv. Mater. ?(2014),?26(8),?1289-1294 Gas phase method Thermal energy are applied A solid precursor material Vapor is formed Nanometric crystal particales are formed Vapor and gas are cooled sputtering resistance heating method radio-frequency heating direct heating Nanoparticals are formed Reactive Gas “Add” or “not Add” Vapor phase templated-assembly technique Hajfathalian M, J. Phys. Chem. C, 2015, 119(30): 17308-17315. Area-selective Atomic Layer Deposition Cao K, et al. Scientific reports, 2015, 5. 8470 VS SAMs Self-assembled monolayers Liquid phase method AB AB-BA AB-CD A-B A-AB A-BC A Heating Precursor HAuCl4 Au Reducing agent Monometallic nanocatalysts Lee H E, et al. ACS Nano. 2015, 9(8): 8384-8393. A-B metallic nanocatalysts Chen S, et al. Angew. Chem. Int. Ed. 2015, 54, 108-113. H2PtCl6 KI Poly (vinyl pyrrolidone) (PVP) CuCl2 ethylene glycol (EG) 140℃, 90 min (a) (b) (c) (a) Huiyuan Zhu et al. Angew. Chem. Int. Ed. 2014, 53, 12508 –12512 Au Mn(acac)2 KBEt3H 240℃ AuMn △T Air Mn/Au=1 Au MnO Au MnO Au rich Mn rich Au Mn