4.8 Article

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

Journal

ACS NANO
Volume 16, Issue 10, Pages 16869-16879

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c06834

Keywords

surface alloy; hydrogenation; PdBi; X-ray absorption spectroscopy; interdiffusion

Funding

  1. National Natural Science Foundation of China [51901147, 21903058, 22173066]
  2. Natural Science and Engineering Council of Canada (NSERC), Canada Foundation for Innovation (CFI), Canada Research Chair (CRC)
  3. Ontario Research Foundation (ORF)
  4. University of Western Ontario
  5. U.S. DOE [DE-AC02-06CH11357]
  6. Canadian Light Source
  7. CFI
  8. NSERC
  9. National Research Council (NRC)
  10. Canadian Institute for Health Research (CIHR)
  11. University of Saskatchewan
  12. CLS Graduate Student Travel Support Program
  13. Suzhou Key Laboratory of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science Technology
  14. 111 Project

Ask authors/readers for more resources

By modulating the surface alloy structure of PdBi, the electronic structure of Pd can be continuously adjusted, leading to enhanced catalytic performance in the selective hydrogenation of propyne.
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 hydro-genation of propyne. The prevented formation of saturated beta- hydrides in the subsurface layers and weakened propene adsorption on the surface contribute to the high selectivity. Our work provides in-depth understanding of the electronic properties of surface alloy structure and underlies the study of the electronic structure-performance relationship in bimetallic catalysts.

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