Well defined single-site catalysts enabled by surface coordination chemistry

Authors: Feng Ryan Wang (University College London)
Co-authored by industrial partner: No

Type: Diamond Annual Review Highlight

State: Published (Approved)
Published: July 2021
Diamond Proposal Number(s): 16966 , 17559 , 18909 , 19246 , 19318 , 20643 , 20847 , 17377 , 15151 , 14239

Abstract: First discovered in the 19th century, RuII compounds are widely used in catalysis, photocatalysis, and medical applications. They are usually obtained in a reductive environment, as molecular oxygen can oxidise RuII to RuIII and RuIV. Researchers designed an airā€stable II Ru site that is coordinated on the polyphenylene-bipyridine (PPhen-bipy) based system. The team used the electron Physical Science Imaging Centre (ePSIC) at Diamond Light Source to confirm the presence of Ru single-site. They performed their study at atomic resolution with High Angle Annular Dark-Field Scanning Transmission Electron Microscopy (HAADF-STEM). X-ray Absorption Spectroscopy (XAS) at Ru K-edge carried out at beamline B18 followed the evolution of the geometric structures of the Ru single-site during CO oxidation. In addition, the HAADF-STEM study confirmed the successful synthesis of eight other metal single-sites coordinated with the PPhen-bipy framework. Those single-sites have well-defined geometric and electronic structures for catalytic applications. Such single-site catalysts exhibit great potential in life sciences and the pharmaceutical industry. The PPhen-bipy framework also enables the study of coordination chemistry at solid/gas interface, helping to understand structure-performance relationship of the surface single-sites.

Journal Keywords: Single-site; Coordination chemistry; Catalysis

Subject Areas: Chemistry

Diamond Offline Facilities: Electron Physical Sciences Imaging Centre (ePSIC)
Instruments: B18-Core EXAFS , E01-JEM ARM 200CF , E02-JEM ARM 300CF

Added On: 12/11/2021 14:21

Discipline Tags:

Physical Chemistry Catalysis Chemistry Chemical Engineering Engineering & Technology

Technical Tags:

Microscopy Spectroscopy Electron Microscopy (EM) Transmission Electron Microscopy (TEM) X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)