摘要
Au-Ag alloy nanoparticles supported on mesoporous aluminosilicate have been prepared by one-pot synthesis using hexadecyltrimethylammonium bromide (CTAB) both as a stabilizing agent for nanoparticles and as a template for the formation of mesoporous structure. The formation of Au-Ag alloy nanoparticles was confirmed by X-ray diffraction (XRD), ultraviolet-visible (UV-vis) spectroscopy, and transmission electron microscopy (TEM). Although the Au-Ag alloy nanoparticles have a larger particle size than the monometallic gold particles, they exhibited exceptionally high activity in catalysis for low-temperature CO oxidation. Even at a low temperature of 250 K, the reaction rate can reach 8.7 × 10-6 mol·gcat. -1·-1 at an Au/Ag molar ratio of 3/1. While neither monometallic Au@MCM-41 nor Ag@MCM-41 shows activity at this temperature, the Au-Ag alloy system shows a strongly synergistic effect in high catalytic activity. In this alloy system, the size effect is no longer a critical factor, whereas Ag is believed to play a key role in the activation of oxygen.
原文 | English |
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頁(從 - 到) | 40-43 |
頁數 | 4 |
期刊 | Journal of Physical Chemistry B |
卷 | 109 |
發行號 | 1 |
DOIs | |
出版狀態 | Published - 2005 1月 13 |
All Science Journal Classification (ASJC) codes
- 物理與理論化學
- 表面、塗料和薄膜
- 材料化學