• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Synthesis of carbon-supported Pd–Co bimetallic catalysts templated by Co nanoparticles using the galvanic replacement method for selective hydrogenation
【24h】

Synthesis of carbon-supported Pd–Co bimetallic catalysts templated by Co nanoparticles using the galvanic replacement method for selective hydrogenation

机译：使用电流置换法进行选择性加氢合成以钴纳米粒子为模板的碳载Pd-Co双金属催化剂

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Pd–Co bimetallic catalysts were prepared by the controlled synthesis of carbon-supported Co catalysts, ranging from single-sites to nanoparticles, via structural transformation of a deposited Co(salen) complex precursor by heat treatment at different temperatures, followed by galvanic replacement with Pd ions. The catalysts were structurally characterized using XRD, TEM, HAADF-STEM, XAFS and XPS. Highly dispersed Pd-rich NPs containing a low concentration of Co species were formed and the original size of the Co NPs was retained. The electronic state of the Pd species was dependent on the size of the bimetallic NPs, and a catalyst with a mean diameter of 10.8 nm was found to be in the most electron-rich state. Not only the particle size, but also the electronic state of Pd play a crucial role in attaining high catalytic activity and selectivity in the selective hydrogenation of phenylacetylene. A Pd–Co catalyst based on a Co catalyst heat-treated at 600 °C showed 92% selectivity at 93% conversion. Furthermore, the Pd–Co catalysts synthesized by the galvanic replacement method showed superior performance to a monometallic Pd catalyst and a Pd–Co alloy catalyst.
机译：Pd-Co双金属催化剂是通过碳负载的Co催化剂的受控合成制备的，范围从单点到纳米颗粒，通过在不同热处理条件下沉积的Co（salen）络合物前体的结构转变进行温度，然后用Pd离子进行电置换。使用XRD，TEM，HAADF-STEM，XAFS和XPS对催化剂进行结构表征。形成了含有低浓度Co物种的高度分散的富含Pd的NP，并且保留了Co NP的原始大小。 Pd物种的电子状态取决于双金属NPs的大小，平均直径为10.8 nm的催化剂处于最富电子状态。在苯乙炔的选择性加氢过程中，Pd的不仅粒径，而且电子状态也起着至关重要的作用。基于在600°C热处理的Co催化剂的Pd-Co催化剂在93％的转化率下显示出92％的选择性。此外，通过电流置换法合成的Pd-Co催化剂表现出优于单金属Pd催化剂和Pd-Co合金催化剂的性能。

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