文献类型：期刊文献

英文题名：Controlled Synthesis and Enhanced Catalytic Activity of Well-Defined Close-Contact Pd-ZnO Nanostructures

作者：Li, Qi[1];Yu, Hongbo[1];Li, Kaijie[1];Yin, Hongfeng[2];Zhou, Shenghu[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, 1219 Zhongguan West Rd, Ningbo 315201, Zhejiang, Peoples R China

年份：2019

卷号：35

期号：19

起止页码：6288

外文期刊名：LANGMUIR

收录：;EI(收录号：20192106941335);WOS:【SCI-EXPANDED(收录号:WOS:000468243500006)】；

基金：S.Z. and H.Y. thank the National Natural Science Foundation of China for financial supports (Grant Nos. 21776090 and 21571183), and H.Y. thanks the Industrial R&D Foundation of Ningbo (Grant No. 2017B10040).

语种：英文

外文关键词：Nanostructures - Catalyst activity - Hydrogenation - Binary alloys - II-VI semiconductors - Intermetallics - Nanocatalysts - Aluminum oxide - High resolution transmission electron microscopy - X ray photoelectron spectroscopy - Alumina

摘要：In this study, PdZn-ordered intermetallic nanoparticles (NPs) were prepared in liquid phase by butyllithium co-reduction of their precursors at 240 degrees C. Through calcination and subsequent reduction with H-2, the synthesized PdZn NPs were then in situ transformed into Pd-ZnO heteroaggregate nanocatalysts on alumina supports. Various characterization techniques, such as diffuse reflectance Fourier transform infrared with CO probes, transmission electron microscopy, X-ray diffraction, H-2 temperature-programmed reduction, and X-ray photoelectron spectra, reveal that PdZn NPs are ordered intermetallic compounds, and in situ transformation of PdZn alloy NPs results in close-contact Pd-ZnO heteroaggregates, where the interfaces are highly active and the interaction between Pd and ZnO prevents the active particles from agglomeration. The catalytic hydrogenations of nitrophenols over Pd/Al2O3 and Pd-ZnO/Al2O3 were investigated. The results show that Pd-ZnO/Al2O3 illustrates an enhanced catalytic activity relative to Pd/Al2O3, and no obvious activity degradation was observed in the recycle catalytic experiments over such nanostructures. It is concluded that the Pd-ZnO interaction not only enhances the catalytic hydrogenation activity but also promotes the thermal and catalytic stability.