CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device
CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device
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DOI：
10.1016/j.cattod.2012.04.037
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发表时间：
2013-03
期刊：
影响因子：
5.3
通讯作者：
M. Nishibori;W. Shin;N. Izu;T. Itoh;I. Matsubara
中科院分区：
文献类型：
--
作者：
M. Nishibori;W. Shin;N. Izu;T. Itoh;I. Matsubara
研究了不同处理条件下Au/ co3o4催化剂在微气敏装置上的CO氧化性能。通过H2in空气流下的h2燃烧处理和H2in N2流下的还原处理，提高了Au/ co3o4催化剂在微装置上的CO氧化性能。在微装置上对Au/ co3o4催化剂进行H2combustion处理，防止了CO氧化性能的下降。为了研究Au/ co3o4催化剂经过还原和h2燃烧处理后的Au和Co的化学状态和微观结构，采用透射x射线吸收精细结构（XAFS）和x射线光电子能谱（XPS）进行了研究。无论处理条件如何，Au/ co3o4的Au颗粒均为金属金。然而，经过h2燃烧处理后，在催化剂表面发现了一个以Co(OH)2形式与过渡金属Co键合的羟基。Au/ co3o4经过h2燃烧处理后，在金属载体界面形成OH−，这被认为是Au/ co3o4催化剂CO氧化性能提高的原因之一。
The CO oxidation performance of the Au/Co3O4catalyst on the micro gas sensor device with different treatment conditions has been investigated. The CO oxidation performance of the Au/Co3O4catalyst on the micro device has been improved by the H2combustion treatment under the flow of H2in air and the reduction treatment under the flow of H2in N2. The H2combustion treatment of the Au/Co3O4catalyst on the micro device prevented the degradation of the CO oxidation performance. To investigate the chemical states and microstructures of Au and Co in the Au/Co3O4catalysts after the reduction and H2combustion treatments, transmission X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS) have been performed. Au particles of Au/Co3O4were found to be metallic Au regardless of the treatment conditions. However, a hydroxyl group bonded to the transition metal Co as a form of Co(OH)2was found on the catalyst surface after the H2combustion treatment. The H2combustion treatment of Au/Co3O4results in the formation of OH−in the metal-support interface, which is considered to be an origin of the improvement of the CO oxidation performance of the Au/Co3O4catalyst.