Istituto di Scienze e Tecnologie Molecolari, Via G. Fantoli, 16/15, 20138 Milano, Italy.
ChemSusChem. 2012 Sep;5(9):1800-11. doi: 10.1002/cssc.201200085. Epub 2012 Jun 13.
Bimetallic Pt-Au nanoparticles supported on reduced anatase nanocrystals represent a new class of promising photocatalysts with high activity in hydrogen production by photoreforming of aqueous solution of renewable feedstock, such as ethanol and glycerol. The catalysts are easily obtained by metal impregnation of commercial TiO₂, followed by a reductive treatment. Remarkably, deeper catalyst pre-reduction results in enhanced photoactivity. When ethanol is used as sacrificial agent, under both UV-A or simulated sunlight irradiation, H₂ is the most abundant product in the gas stream whereas, in the case of glycerol, significant amounts of CO₂ have also been detected, indicating a more efficient oxidation of the organic sacrificial agent. The presence of bimetallic Pt-Au nanoparticles and of Ti³⁺ sites/O²⁻ vacancies in the bulk structure of titania are two key parameters to maximize light absorption and feedstock activation, finally resulting in good photocatalytic performances.
担载在还原锐钛矿纳米晶上的双金属 Pt-Au 纳米粒子是一类很有前途的新型光催化剂，在以可再生原料（如乙醇和甘油）水溶液为原料的光重整制氢反应中具有很高的活性。这类催化剂可通过商业 TiO2 的金属浸渍，然后进行还原处理来很容易地获得。值得注意的是，催化剂的深度预还原会导致光催化活性增强。当以乙醇作为牺牲剂时，在 UV-A 或模拟太阳光照射下，H2 是气流中最丰富的产物，而在甘油的情况下，也检测到了大量的 CO2，表明有机牺牲剂的氧化更为有效。担载双金属 Pt-Au 纳米粒子和钛基体中的 Ti³⁺位/O²⁻空位是两个关键参数，可以最大限度地提高光吸收和原料活化，最终实现良好的光催化性能。
