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首页> 外文期刊>Catalysis science & technology >Galvanic synthesis of AgPd bimetallic catalysts from Ag clusters dispersed in a silica matrix
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Galvanic synthesis of AgPd bimetallic catalysts from Ag clusters dispersed in a silica matrix

机译：电合成AgPd双金属催化剂从农业集群分散在硅矩阵

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摘要

While bottom-up synthetic strategies for the formation of near-monodisperse clusters have attracted much attention, top-down synthetic strategies in which metals are dispersed into clusters can also be viable. In this study, we follow up previous work that showed the formation of Ag clusters dispersed in a silica matrix by breaking up larger triangular Ag nanoparticles upon calcination in air. AgPd bimetallic catalysts were synthesized via a galvanic replacement reaction of these thermally activated Ag clusters in a silica matrix. The galvanic reaction of the Ag clusters with Pd(ii) salts was monitored by in situ XANES spectroscopy. Interestingly, extended X-ray absorption fine structure (EXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS) studies suggested that the majority of the Ag atoms are located on the surface of the resulting clusters and Pd atoms are in the core region. The catalytic activity for 3-hexyne-1-ol hydrogenation was investigated and the AgPd@SiO2 catalysts showed superior selectivity for the selective hydrogenation to 3-hexene-1-ol.
机译：而自下而上的合成策略near-monodisperse集群的形成吸引了很多注意力,自上而下的合成战略金属的分散集群可以可行。跟进以前的工作表明形成Ag)集群的分散在硅矩阵分手大三角Ag纳米颗粒在空气中煅烧。通过电催化剂合成置换反应的热激活Ag)集群在硅矩阵。反应的Ag)集群与Pd(2)盐原位监测由黄嘌呤光谱学。有趣的是,扩展x射线吸收精细结构(EXAFS)谱和x射线光电子能谱(XPS)研究建议大部分Ag原子位于表面产生的集群和Pd原子在核心区域。催化活性的3-hexyne-1-ol加氢研究和AgPd@SiO2催化剂表现出优越的选择性选择性加氢3-hexene-1-ol。

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