AuPt Alloy on TiO<sub>2</sub>: A Selective and Durable Catalyst for<scp>l</scp>-Sorbose Oxidation to 2-Keto-Gulonic Acid
作者:Carine E. Chan-Thaw、Lidia E. Chinchilla、Sebastian Campisi、Gianluigi A. Botton、Laura Prati、Nikolaos Dimitratos、Alberto Villa
DOI:10.1002/cssc.201501202
日期:2015.12
observed with acidic supports (TiO2 and H‐Mordenite) that were able to minimize the formation of C1/C2 products. We also demonstrated that, by alloying Pt to Au, it is possible to enhance significantly the selectivity of Pt‐based catalysts. Moreover, the AuPt catalyst, unlike monometallic Pt, showed good stability in recycling because of the prevention of metal leaching during the reaction.
Pt纳米颗粒通过溶胶固定化方法制备,沉积在具有不同酸/碱性质(MgO,活性炭,TiO 2,Al 2 O 3,H-丝光沸石)的载体上,并进行了山梨糖选择性氧化为2-酮的测试。 β-古洛糖酸(2-KGUA)是维生素C的重要前体。通常,随着载体碱性的增加,催化活性也随之提高。然而,在大多数情况下,观察到强烈的失活。在酸性载体(TiO 2和H-丝光沸石)上观察到对2-KGUA的最佳选择性,这些载体能够最大程度地减少C 1 / C 2的形成产品。我们还证明,通过将Pt与Au合金化,可以显着提高Pt基催化剂的选择性。而且,AuPt催化剂与单金属Pt不同,由于防止了反应中的金属浸出,因此在循环中显示出良好的稳定性。