Active size-controlled Ru catalysts for selective CO oxidation in H2
Active size-controlled Ru catalysts for selective CO oxidation in H2
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DOI：
10.1016/j.apcatb.2012.08.010
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发表时间：
2012-10
影响因子：
22.1
通讯作者：
Y. Kim;J. Park;Hyun-Yong Lee;S. Choi;E. Park
中科院分区：
文献类型：
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作者：
Y. Kim;J. Park;Hyun-Yong Lee;S. Choi;E. Park
我们提出了一种活化方法来控制负载型Ru催化剂（即商用Ru/ al2o3和自制Ru/SiO2）中Ru的粒径，以提高其对CO优先氧化（PROX）的催化活性。通过调整预处理条件，可以控制Ru的粒径大小，影响负载型Ru催化剂的催化活性。采用电感耦合等离子体原子发射光谱（ICP-AES）、亮场透射电子显微镜（TEM）、x射线吸收精细结构（XAFS）、CO化学吸附和o2化学吸附等方法对催化剂进行表征。h2和o2的共存是精确控制Ru粒度的必要条件。随着Ru颗粒尺寸的增大，PROX活性增加，尤其是在低温下，这似乎与o2o在Ru表面的吸附行为密切相关。
We propose an activation method to control Ru particle size in supported Ru catalysts, viz. commercial Ru/Al2O3and home-made Ru/SiO2, in order to increase the catalytic activity for the preferential CO oxidation (PROX). Ru particle size is controlled by adjusting pre-treatment conditions and it affects the catalytic activity for the PROX over supported Ru catalysts. Several measurements: inductively coupled plasma-atomic emission spectroscopy (ICP-AES), bright-field transmission electron microscopy (TEM), X-ray absorption fine structure (XAFS), CO chemisorption, and O2chemisorption were conducted to characterize the catalysts. The co-presence of H2and O2is essential for controlling the Ru particle size accurately. The PROX activity especially at low temperatures increases with increasing particle size of Ru, which seems to be closely related to the adsorption behavior of O2on Ru surface.