...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Directed synthesis of well dispersed and highly active AuCu and AuNi nanoparticle catalysts
【24h】

Directed synthesis of well dispersed and highly active AuCu and AuNi nanoparticle catalysts

机译：直接合成和高度分散积极AuCu和AuNi纳米催化剂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Controlled synthesis of bimetallic catalysts has attracted much attention in heterogeneous catalysis because their catalytic activity often depends on their size and structure. Traditional modification methods have no control over the deposition of the first metal, but concentrate on using the dispersion of the first metal to control the deposition of the second metal, resulting in the deficiency in controlling the dispersion of final bimetallic catalysts. In this work, one new method was proposed to control the synthesis of supported bimetallic AuCu and AuNi catalysts by controlling the dispersion of both the first metal and second metal. The first metal (Cu or Ni) of bimetallic nanoparticles was well dispersed as a configurational ion of hydrotalcites (HTs), which interacted with the other metal (Au) of bimetallic nanoparticles by a spontaneous redox and alloying reaction. The good dispersion of the first metal controlled the good dispersion of the final bimetallic nanoparticles through the interaction between the two metals. The size, structure and composition of bimetallic nanoparticles were characterized using X-ray diffraction (XRD), nitrogen physisorption, X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM) techniques. The mean sizes of the bimetallic nanoparticles were 1.9 nm for AuCu and 2.8 nm for AuNi, which were much smaller than that prepared by traditional methods (> 8.7 nm). The catalytic activity of AuCu and AuNi nanoparticles in the aerobic oxidation of benzyl alcohol was tested, which showed far higher activity than those prepared by traditional methods.
机译：双金属催化剂的可控合成在异构吸引了太多的关注催化经常因为他们的催化活性取决于它们的大小和结构。修改方法无法控制沉积的金属,而是集中精力使用分散的金属控制第二沉积的金属,导致缺乏控制最终双金属催化剂的分散。工作,提出了一个新的方法来控制合成双金属AuCu和AuNi支持通过控制催化剂的分散第一金属和第二金属。(铜或镍)的双金属纳米颗粒很好分散的构型离子水滑石(高温超导)与互动其他金属的双金属纳米颗粒(Au)自发的氧化还原和合金化反应。分散的第一金属良好的控制最终双金属纳米颗粒的分散通过两种金属之间的相互作用。的大小,结构和组成双金属纳米粒子被认为是使用x射线氮气物理吸附、x射线衍射(XRD)光电子能谱(XPS)和扫描透射电子显微镜(茎)技术。纳米粒子为1.9 nm AuCu为2.8 nmAuNi,比这小得多的准备通过传统方法(> 8.7海里)。AuCu和AuNi纳米粒子的活性有氧氧化苯甲醇进行了测试,显示活动远远高于那些吗由传统的方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号