Promotional effect of Pd single atoms on Au nanoparticles supported on silica for the selective hydrogenation of acetylene in excess ethylene
Promotional effect of Pd single atoms on Au nanoparticles supported on silica for the selective hydrogenation of acetylene in excess ethylene
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DOI：
10.1039/c3nj01136d
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发表时间：
2014-04
影响因子：
3.3
通讯作者：
Guangxian Pei;Xiaoyan Liu;Aiqin Wang;Lin Li;Yanqiang Huang;Zhang Tao;Jonathan Lee;B. Jang;
中科院分区：
文献类型：
--
作者：
Guangxian Pei;Xiaoyan Liu;Aiqin Wang;Lin Li;Yanqiang Huang;Zhang Tao;Jonathan Lee;B. Jang;
通过在二氧化硅上负载Au与Pd合金化，构建了一种Pd单原子合金(SAA)结构。X射线衍射和高分辨电子显微镜结果表明，少量Pd的加入有效地阻止了Au纳米颗粒的烧结。DIFTS和EXAFS结果表明，当Pd/Au的原子比小于0.025时，形成了PdSAA结构。与相应的单金属Au或Pd体系相比，Pd SAA结构对过量乙烯中乙炔的选择加氢反应表现出更好的催化性能。
A Pd single-atom alloy (SAA) structure was constructed by alloying Pd with Au supported on silica. The XRD and HRTEM results demonstrated that the addition of a small amount of Pd efficiently prevented the sintering of Au nanoparticles. The DRIFTS and EXAFS results confirmed that the Pd SAA structure was formed when the atomic ratios of Pd/Au were lower than 0.025. The Pd SAA structure exhibits a much better catalytic performance for the selective hydrogenation of acetylene in excess ethylene than the corresponding monometallic Au or Pd systems.