Construction of trace silver modified core@shell structured Pt-Ni nanoframe@CeO2 for semihydrogenation of phenylacetylene

查看全文 作　　者：Yan [1,2]Long;Jian [1,3]Li;Lanlan [1]Wu;Qishun [1,3]Wang;Yu [1,2]Liu;Xiao [1]Wang;Shuyan [1]Song;Hongjie [1]Zhang 机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;[2]University of Chinese Academy of Sciences, Beijing 100049, China;[3]University of Science and Technology of China, Hefei 230026, China 出　　处：《Nano Research》索引2019年第12卷第4期,共7页 基　　金：National Natural Science Foundation of China (Nos. 21590794, 21771173, and 21521092);project development plan of science and technology of Jilin Province (Nos. 20180101179JC and 20160520126JH);CAS-CSIRO project (GJHZ1730). 摘　　要：The Pt-Ni nanoframe catalysts have attracted great interest owing to their unique electronic structure and excellent catalytic performance. However, the stability of the tenu ous edges of nano frame-structures is dissatisfactory and their un iversal applicati ons in catalytic market beyond electrocatalytic reactions are yet to be tapped and explored. Herein, we developed a new core@ shell structured Pt-Ni nanoframe@CeO2 (Pt-Ni NF@CeO2) composite via etching the Ni from inhomogeneous Pt-Ni rhombic dodecahedra (Pt-Ni RD) by cerium(lll) acetate hydrate (Ce(OAc)3). In this path, Pt-Ni RD was used as self-sacrificial 怕mplate, while the Ce(OAc)3 serves as the provider of the Ce3* source and OH' for the formation of CeO2 shell, etchant of Pt-Ni RD, and the surface modification agent. By this way, the etching of Pt-Ni RD and the formation of the CeO2 shell are simultaneously proceeded to form the final Pt-Ni NF@CeO2 in one step. The obtained Pt-Ni NF@CeO2 exhibits strong in terfacial charge tran sfer interactio n betwee n Pt-Ni NF core and CeO2 shell eve n without reductio n treatment, leading to enhan ced catalytic activity in the hydrogenation of phenylacetylene. After introduction of trace silver, the Pt-Ni-Ag4.9 NF@CeO2 achieves remarkable catalytic performa nee for the selective con versi on of phe ny lacetyle ne to styrene: high con version (100%), styre ne selectivity (86.5%), and good stability. It reveals that enc apsulatio n n oble metal nano frames into metal oxide to form core @ shell structured hybrids will in deed enhance their stability and catalytic properties. Particularly, this work expends the application of noble metal nanoframes materials to hydrogenation reacti ons. 关 键 词：CEO2 Pt-Ni nanoframes core@shell sturcuture silver modification HYDROGENATION of PHENYLACETYLENE