Gold-Iron Oxide Catalyst for CO Oxidation: Effect of Support Structure
Gold-Iron Oxide Catalyst for CO Oxidation: Effect of Support Structure
复制标题
金铁氧化物催化剂用于 CO 氧化：支撑结构的影响
DOI：
10.3390/catal6030037
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发表时间：
2016-03-01
期刊：
影响因子：
3.9
通讯作者：
Si, Rui
中科院分区：
文献类型：
--
作者：
Cui, Hui-Zhen;Guo, Yu;Si, Rui
金-铁氧化物（Au/FeOx）是一种高活性的CO氧化催化剂，也是研究金催化化学的典型体系。在这项工作中，两种不同类型的氧化铁载体，即，羟基化氧化铁（Fe_OH）和脱水氧化铁（Fe_O）已被用于通过沉积-沉淀（DP）法沉积金。通过选择沉淀pH值为6.7-11.2（Fe_OH）或改变煅烧温度为200 - 600 °C（Fe_O）来调节氧化铁的结构。然后，lwt. %的Au催化剂在这些氧化铁载体上的低温CO氧化反应进行了测量。新鲜样品和使用过的样品都通过多种技术进行了表征，包括透射电子显微镜（TEM）和高分辨率TEM（HRTEM），X射线衍射（XRD），X射线光电子能谱（XPS），X射线吸收近边结构（XANES）和氢气程序升温还原（H2-TPR）。研究表明，铁氧化物载体的表面性质以及金属-载体间的相互作用对Au/FeOx催化剂的CO氧化性能起着至关重要的作用。
Gold-iron oxide (Au/FeOx) is one of the highly active catalysts for CO oxidation, and is also a typical system for the study of the chemistry of gold catalysis. In this work, two different types of iron oxide supports, i.e., hydroxylated (Fe_OH) and dehydrated iron oxide (Fe_O), have been used for the deposition of gold via a deposition-precipitation (DP) method. The structure of iron oxide has been tuned by either selecting precipitated pH of 6.7–11.2 for Fe_OH or changing calcination temperature of from 200 to 600 °C for Fe_O. Then, 1 wt. % Au catalysts on these iron oxide supports were measured for low-temperature CO oxidation reaction. Both fresh and used samples have been characterized by multiple techniques including transmission electron microscopy (TEM) and high-resolution TEM (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES) and temperature-programmed reduction by hydrogen (H2-TPR). It has been demonstrated that the surface properties of the iron oxide support, as well as the metal-support interaction, plays crucial roles on the performance of Au/FeOx catalysts in CO oxidation.