期刊
ULTRAMICROSCOPY
卷 156, 期 -, 页码 18-22出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2015.05.003
关键词
Operando; In-situ TEM; Environmental TEM (ETEM); TEM sample; EELS; Catalyst
类别
资金
- US National Science Foundation [NSF-CBET1134464]
A new TEM sample preparation method is developed to facilitate operand TEM of gas phase catalysis. A porous Pyrex-fiber pellet TEM sample was produced, allowing a comparatively large amount of catalyst to be loaded into a standard Gatan furnace-type tantalum heating holder. The increased amount of catalyst present inside the environmental TEM allows quantitative determination of the gas phase products of a catalytic reaction performed in-situ at elevated temperatures. The product gas concentration was monitored using both electron energy loss spectroscopy (EELS) and residual gas analysis (RGA). Imaging of catalyst particles dispersed over the pellet at atomic resolution is challenging, due to charging of the insulating glass fibers. To overcome this limitation, a metal grid is placed into the holder in addition to the pellet, allowing catalyst particles dispersed over the grid to be imaged, while particles in the pellet, which are assumed to experience identical conditions, contribute to the overall catalytic conversion inside the environmental TEM cell. The gas within the cell is determined to be well-mixed, making this assumption reasonable. (C) 2015 Elsevier B.V. All rights reserved
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据