Chiang Chia-Wen, Wang Aiqin, Wan Ben-Zu, Mou Chung-Yuan
Center for Condensed Matter Sciences and Department of Chemistry, National Taiwan University, Taipei, Taiwan 106.
J Phys Chem B. 2005 Sep 29;109(38):18042-7. doi: 10.1021/jp052867v.
While there is a large number of recent studies of Au nanocatalysts supported on metal oxides, low-temperature CO oxidation under an acidic environment has not yet been accomplished. Over a novel acidic Al-SBA-15 support, uniformly distributed gold nanoparticles with sizes approximately 2.7 nm were obtained by a successive procedure of aminosilane grafting, gold adsorption-reduction, and then high-temperature hydrogen treatment. The catalyst system, Au@Al-SBA-15, exhibits extraordinarily high activity for CO oxidation at 80 degrees C. By varying the Si/Al ratio of the support, the dependence of the catalytic activity on the support Si/Al ratio was found in the CO oxidation reaction.
虽然最近有大量关于负载在金属氧化物上的金纳米催化剂的研究，但在酸性环境下的低温CO氧化尚未实现。通过氨基硅烷接枝、金吸附还原以及随后的高温氢气处理的连续过程，在新型酸性Al-SBA-15载体上获得了尺寸约为2.7 nm的均匀分布的金纳米颗粒。催化剂体系Au@Al-SBA-15在80℃下对CO氧化表现出极高的活性。通过改变载体的Si/Al比，发现在CO氧化反应中催化活性对载体Si/Al比的依赖性。
