A simple one pot synthesis of mesoporous silica hosted silver catalyst and its low-temperature CO oxidation
A simple one pot synthesis of mesoporous silica hosted silver catalyst and its low-temperature CO oxidation
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DOI：
10.1016/j.micromeso.2013.12.029
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发表时间：
2014-04
影响因子：
5.2
通讯作者：
Z. Qu;Xiaodong Zhang;F. Yu;Jingxuan Jia
中科院分区：
文献类型：
--
作者：
Z. Qu;Xiaodong Zhang;F. Yu;Jingxuan Jia
采用十二胺（DDA）作为封端剂和结构导向剂的一种新的、简单的一锅法合成了二氧化硅负载的银纳米粒子。采用XRD、N2吸附-脱附等温线、TEM和TG-DTA对催化剂进行了表征。结果表明，银的负载量和粒径与表面活性剂DDA密切相关。此外，由于DDA在热处理过程中分解形成的局部还原环境，可以阻止Ag纳米粒子的聚集，有利于在HMS载体上形成均匀分散的Ag纳米粒子（1.5-4.5 nm）。对CO氧化反应的催化活性（T98（CO）= 20 °C）表明，该方法是制备高分散纳米银催化剂的有效方法。
A novel and simple one pot synthesis approach using dodecylamine (DDA) as capping agent and structure director has been employed to synthesize the silica-supported Ag nanoparticles. The catalysts were characterized by XRD, N2adsorption–desorption isotherms, TEM and TG-DTA. It was found that the loading and particle size of Ag were strongly related to the surfactant DDA. In addition, the formed local reductive environmental due to the decomposition of DDA during thermal treatment procedure could prevent the aggregation of Ag nanoparticles and be benefit for the formation of uniformly dispersed Ag nanoparticles on the HMS support (1.5–4.5 nm). The excellent catalytic activity for CO oxidation (T98(CO) = 20 °C) demonstrated that the method was effective for synthesizing the highly dispersed nano-silver catalyst.