期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 382, 期 -, 页码 55-63出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2013.10.025
关键词
Nanoporous Ag; Unsupported catalyst; CO oxidation; Catalytic activity; Dealloying
资金
- National Basic Research Program of China [973, 2012CB932800]
- Open Project of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing (SELF)
- Program for New Century Excellent Talents in University [NCET-11-0318]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20120131110017]
- National Natural Science Foundation of China [51371106]
This work discussed the catalytic performance towards CO oxidation over unsupported nanoporous Ag (np-Ag) catalysts synthesized by dealloying of Mg77Ag23 (at.%) alloy under controllable etching conditions. The np-Ag catalysts were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) analysis, X-ray photoelectron spectroscopy (XPS) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The np-Ag catalysts exhibit an open, bicontinuous interpenetrating ligament-channel structure. The np-Ag samples fabricated under different conditions possess distinct feature sizes ranging from similar to 15.7 to similar to 142.6 nm. Without any heat-treatment, the asobtained np-Ag catalysts were utilized for catalysis tests. The results reveal that the catalytic activity of the unsupported np-Ag catalysts is comparable with or even better than that of supported Ag catalysts with heat-treatment. In addition, the role of residual Mg and feature size in the catalytic activity of the np-Ag catalysts has been clarified. The catalytic mechanism of the present unsupported np-Ag catalysts has also been discussed. (C) 2013 Elsevier B.V. All rights reserved.
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