Pt Catalysts For Oxidation Research Articles

Synthesis, Characterization and Application of Thermostable Hydrophobic Pt Catalysts for Oxidation of H2

The studies were aimed at the development of thermostable hydrophobic Pt catalyst for hydrogen oxidation in the close-to-stoichiometric mixture with oxygen to provide the high gas conversion at the temperature not higher than 353 K in the direct contact with water. The catalyst is to be used for utilization of radiolytic gases (hydrogen and oxygen) at atomic power stations. The studies were focused on the Pt/Al 2 O 3 type catalyst with a modified surface. Modified γ-Al 2 O 3 was used for preparation of catalysts containing 0.5 wt% of platinum. The catalyst hydrophobicity, thermal stability, texture, surface composition, catalytic performance for hydrogen oxidation, and operational stability were studied during 50-hour testing. The established properties of the catalyst were thermal stability up to 773 K, superhydrophobic surface, reaction rate constants no less than 4±1 s –1 (at 333 K). The oxidation efficiency was no less than 99.999 % at the hydrogen flow rate of 50 L/h. The results obtained demonstrate potentialities of the prepared hydrophobic catalyst and of the technology for hydrogen oxidation over this catalyst.

Electrooxidation of ethylene glycol and glycerol by platinum-based binary and ternary nano-structured catalysts

Spray pyrolysis of metal precursors was used to synthesize binary and ternary nano-structured Pt-based catalysts. Characterization of the catalysts was performed using SEM, TEM, and EDS to determine morphology, purity and composition. The electrochemical performance of synthesized Pt84Ru16, Pt96Sn4, and Pt88Ru6Sn6 was evaluated via cyclic voltammetry and steady state polarization for oxidation of ethylene glycol and glycerol. The binary Pt84Ru16 and Pt96Sn4 catalysts had higher maximum currents and better stability than a templated Pt catalyst and templated ternary Pt88Ru6Sn6 catalyst. All binary and ternary catalysts had less adsorbed reaction products during potential cycling than the templated platinum electrocatalyst. In situ infrared reflection absorption spectroscopy (IRRAS) analysis showed complete oxidation of ethylene glycol and glycerol with the binary and ternary catalysts by CO2 generation. This work emphasizes the benefits provided by adding Ru and Sn to Pt catalysts for oxidation of complex alcohols.

Electrooxidation of Ethylene Glycol and Glycerol by Pt Based Binary and Ternary Templated Catalysts in Alkaline Media

Spray pyrolysis of metal precursors was used to synthesize binary and ternary templated Pt based catalysts. Characterization of the catalysts was performed using SEM, TEM, and EDS to determine morphology, purity and composition. The electrochemical performance of PtRu, PtSn, and PtRuSn was evaluated via cyclic voltammetry and steady state polarization for oxidation of ethylene glycol and glycerol. The ternary PtRuSn catalyst had the highest metal utilization, as well as the highest maximum current. This work emphasizes the gains provided by adding modifiers to Pt catalysts for oxidation of complex alcohols.