Nanostructured Au-CeO2 catalysts for low-temperature water-gas shift
Nanostructured Au-CeO2 catalysts for low-temperature water-gas shift
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DOI：
10.1023/a:1012666128812
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发表时间：
2001-01-01
影响因子：
2.8
通讯作者：
Flytzani-Stephanopoulos, M
中科院分区：
文献类型：
--
作者：
Fu, Q;Weber, A;Flytzani-Stephanopoulos, M
纳米结构金与氧化铈的复合体系。金负载量为5- 8wt%，在这项工作中被报道为用于低温水煤气变换的非常好的催化剂。活性在很大程度上取决于纳米二氧化铈颗粒的存在。讨论了制备活性催化剂的各种技术。金的存在对于低于300 ℃的活性至关重要。在310-480 ℃至25-110 ℃范围内，金对氧化铈表面氧的还原有显著的影响。氧化铈的表面有效氧全部被还原，而体相氧没有受到影响。这与Au-ceria系统的转移活性很好地相关。
The composite system of nanostructured gold and cerium oxide, with a. gold loading 5-8 wt%, is reported in this work as a very good catalyst for low-temperature water-gas shift. Activity depends largely on the presence of nanosized ceria particles. Various techniques of preparation of an active catalyst are disscussed. The presence of gold is crucial for activity below 300 degreesC. A dramatic effect of gold on the reducibility of the surface oxygen of ceria is found by H-2-TPR, from 310-480 degreesC to 25-110 degreesC. All of the available surface oxygen was reduced, while there was no effect on the bulk oxygen of ceria. This correlates well with the shift activity of the Au-ceria system.