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Galvanic synthesis of AgPd bimetallic catalysts from Ag clusters dispersed in a silica matrix
Catalysis Science & Technology ( IF 5 ) Pub Date : 2020-10-29 , DOI: 10.1039/d0cy01675f
V. Sudheeshkumar 1, 2, 3, 4 , Maryam Alyari 1, 2, 3, 4 , Mahesh Gangishetty 2, 5, 6 , Robert W. J. Scott 1, 2, 3, 4
Affiliation  

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.

中文翻译:

从分散在二氧化硅基质中的银团簇电合成AgPd双金属催化剂

尽管自下而上的合成策略形成近单分散的簇引起了广泛的关注,但自上而下的将金属分散成簇的合成策略也是可行的。在这项研究中,我们跟进了先前的工作,该工作显示了在空气中煅烧时通过分解较大的三角形Ag纳米颗粒而分散在二氧化硅基质中的Ag簇的形成。AgPd双金属催化剂是通过这些热活化的Ag簇在二氧化硅基质中的电置换反应合成的。Ag团簇与Pd(II)盐的电反应通过原位监测XANES光谱。有趣的是,扩展的X射线吸收精细结构(EXAFS)光谱和X射线光电子能谱(XPS)研究表明,大多数Ag原子位于所得簇的表面,而Pd原子位于核心区域。研究了3-己炔-1-醇加氢的催化活性,AgPd @ SiO 2催化剂对3-己烯-1-醇的选择性加氢显示出优异的选择性。
更新日期:2020-11-04
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