负载型金催化剂上氧化金的直接证据。

Direct evidence of oxidized gold on supported gold catalysts.

作者信息

Fu L, Wu N Q, Yang J H, Qu F, Johnson D L, Kung M C, Kung H H, Dravid V P

出版信息

J Phys Chem B. 2005 Mar 10;109(9):3704-6. doi: 10.1021/jp045117e.

Abstract

Supported gold catalysts have drawn worldwide interest due to the novel properties and potential applications in industries. However, the origin of the catalytic activity in gold nanoparticles is still not well understood. In this study, time-of-flight secondary ion mass spectroscopy (TOF-SIMS) has been applied to investigate the nature of gold in Au (1.3 wt %)/gamma-Al2O3 and Au (2.8 wt %)/TiO2 catalysts prepared by the deposition-precipitation method. The SIMS spectrum of the supported gold catalysts presented AuO-, AuO2-, and AuOH- ion clusters. These measurements show direct evidence for oxidized gold on supported gold catalysts and may be helpful to gaining better understanding of the origin of the catalytic activity.

摘要

负载型金催化剂因其新颖的性质和在工业中的潜在应用而引起了全球关注。然而，金纳米颗粒催化活性的起源仍未得到很好的理解。在本研究中，飞行时间二次离子质谱（TOF-SIMS）已被用于研究通过沉积沉淀法制备的Au（1.3 wt%）/γ-Al2O3和Au（2.8 wt%）/TiO2催化剂中Au的性质。负载型金催化剂的SIMS谱图呈现出AuO-、AuO2-和AuOH-离子簇。这些测量结果为负载型金催化剂上的氧化金提供了直接证据，可能有助于更好地理解催化活性的起源。