二氧化钛负载的金铂合金：一种用于将L-山梨糖氧化为2-酮基-L-古龙酸的选择性耐用催化剂。

AuPt Alloy on TiO2: A Selective and Durable Catalyst for L-Sorbose Oxidation to 2-Keto-Gulonic Acid.

作者信息

Chan-Thaw Carine E, Chinchilla Lidia E, Campisi Sebastian, Botton Gianluigi A, Prati Laura, Dimitratos Nikolaos, Villa Alberto

机构信息

Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133, Milano, Italy.

Canadian Centre of Electron Microscopy, Department of Materials Science and Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4M1, Canada.

出版信息

ChemSusChem. 2015 Dec 21;8(24):4189-94. doi: 10.1002/cssc.201501202. Epub 2015 Nov 27.

DOI:10.1002/cssc.201501202

PMID:26611807

Abstract

Pt nanoparticles were prepared by a sol immobilization route, deposited on supports with different acid/base properties (MgO, activated carbon, TiO2 , Al2O3, H-Mordenite), and tested in the selective oxidation of sorbose to 2-keto-gulonic acid (2-KGUA), an important precursor for vitamin C. In general, as the basicity of the support increased, a higher catalytic activity occurred. However, in most cases, a strong deactivation was observed. The best selectivity to 2-KGUA was 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.

摘要

通过溶胶固定化路线制备了铂纳米颗粒，将其沉积在具有不同酸碱性质的载体（氧化镁、活性炭、二氧化钛、氧化铝、氢型丝光沸石）上，并用于将山梨糖选择性氧化为2-酮古洛糖酸（2-KGUA）的反应中进行测试，2-酮古洛糖酸是维生素C的重要前体。一般来说，随着载体碱性的增加，催化活性会提高。然而，在大多数情况下，会观察到强烈的失活现象。在能够使C1/C2产物形成最小化的酸性载体（二氧化钛和氢型丝光沸石）上观察到对2-KGUA的最佳选择性。我们还证明，通过将铂与金合金化，可以显著提高铂基催化剂的选择性。此外，与单金属铂不同，金铂催化剂在循环使用中表现出良好的稳定性，因为在反应过程中防止了金属浸出。