Fabrication of a PdAg mesocrystal catalyst for the partial hydrogenation of acetylene
Fabrication of a PdAg mesocrystal catalyst for the partial hydrogenation of acetylene
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DOI：
10.1016/j.jcat.2015.06.017
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发表时间：
2015-10-01
影响因子：
7.3
通讯作者：
Li, Dianqing
中科院分区：
文献类型：
--
作者：
He, Yufei;Liu, Yanan;Li, Dianqing
介晶PdAg纳米合金是由PdAg纳米颗粒单元通过定向附着途径组装而成，随后固定在水滑石上，水滑石是一种提供可调碱性和酸性以及高吸附容量的优点的载体。钯和银原子均匀分布在整个海胆状介晶。负载的PdAg介晶表现出显着增强的催化性能在乙炔部分加氢时，与传统的PdAg纳米粒子相比，与四倍的营业额增加频率。高活性可归因于介晶PdAg催化剂中存在的晶界，其促进H-2活化/解离。此外，负载型PdAg介晶催化剂的乙烯选择性的提高可能归因于潜在的有序面，这源于结构单元的定向连接。(C)2015 Elsevier Inc. All rights reserved.
Mesocrystalline PdAg nanoalloys have been assembled from PdAg nanoparticle units via an oriented attachment pathway and subsequently immobilized on hydrotalcite a support that offers the advantages of tunable basicity and acidity, as well as high adsorption capacity. Pd and Ag atoms were homogeneously distributed throughout the sea urchin-like mesocrystals. The supported PdAg mesociystals showed a significant enhancement in catalytic performance in the partial hydrogenation of acetylene when compared with the conventional PdAg nanoparticles, with a fourfold increase in turnover frequency. The high activity can be ascribed to the presence of grain boundaries in the mesocrystalline PdAg catalyst, which facilitate H-2 activation/dissociation. In addition, the increase in the selectivity toward ethene over supported PdAg mesocrystals catalyst may be ascribed to the potential ordered facets, which originated from the oriented attachment of building units. (C) 2015 Elsevier Inc. All rights reserved.