ACS Nano: Unveiling the Local Structure and Electronic Properties of PdBi Surface Alloy for Selective Hydrogenation of Propyne

Title：

Unveiling the Local Structure and Electronic Properties of PdBi Surface Alloy for Selective Hydrogenation of Propyne

Authors：

Xuchun Wang^1,2#, Mingyu Chu^1#, Mengwen Wang^1#, Qixuan Zhong¹, Jiatang Chen², Zhiqiang Wang², Muhan Cao¹, Hao Yang¹, Tao Cheng¹, Jinxing Chen¹*, Tsun-Kong Sham²*, and Qiao Zhang¹*

Institutions：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China

²Department of Chemistry, University of Western Ontario, London, Ontario N6A5B7, Canada

Abstract：

Building a reliable relationship between the electronic structure of alloyed metallic catalysts and catalytic performance is important but remains challenging due to the interference from many entangled factors. Herein, a PdBi surface alloy structural model, by tuning the deposition rate of Bi atoms relative to the atomic interdiffusion rate at the interface, realizes a continuous modulation of the electronic structure of Pd. Using advanced X-ray characterization techniques, we provide a precise depiction of the electronic structure of the PdBi surface alloy. As a result, the PdBi catalysts show enhanced propene selectivity compared with the pure Pd catalyst in the selective hydrogenation of propyne. The prevented formation of saturated β-hydrides in the subsurface layers and weakened propene adsorption on the surface contribute to the high selectivity. Our work provides indepth understanding of the electronic properties of surface alloy structure and underlies the study of the electronic structure−performance relationship in bimetallic catalysts.

IF：

18.027

Link：

https://pubs.acs.org/doi/10.1021/acsnano.2c06834