熔盐电解制备Zr基低价金属氧化物担载铂催化剂催化氧化甲醇和CO

通过在700℃下的CaCl_2和NaCl混合熔盐中电化学还原ZrO_2制备得到了Zr的低价金属氧化物ZrO0.35,该低价金属氧化物作为铂催化剂载体催化甲醇显示了很高的催化活性和稳定性。分析了该催化剂的组成结构和电化学行为。结果显示,在酸性介质中该载体能够有效地提高铂纳米颗粒对甲醇和CO的催化活性。有两种机制可以解释其表现:一是电子协同效应,即Zr原子的电子转移到Pt原子,Pt与CO的相互作用力减弱,从而抑制了Pt中毒;另外一方面是Pt和金属载体的协同效应,它可以有效地移除和氧化CO的中间体。

Molten Salt Electrochemical Reduction of Zirconium Dioxide as Platinum Catalyst Carrier for Reduction of Methanol and CO

A simple and effective electrochemical route was adopted to prepare highly stable and catalytic activity support materials for Pt catalysts for methanol catalytic by the partial metallization of ZrO2 in molten salts at 700℃.The composition and structural characteristics of the catalyst were investigated,and the electrochemical behaviors of the catalyst were examined.The results show that the carrier produced by moltensalts electrolysis can significantly enhance catalytic activity of Pt nanoparticles towards the oxidation of CO and methanol in an acidic medium.Two mechanism are accounted for the enhanced performance;one is the electronic effects,namely the electron transfer from Zr to Pt suppresses the poisoning CO adsorption on Pt sites and weakens the Pt=CO bond;the other is the synergistic effect between the carrier and Pt atom,which can facilitate the feasible removal and oxidation of poisoning intermediate CO.