Operando Spectrokinetic Investigations of Low Temperature Water-Gas Shift Catalysts: SSITKA- DRIFTS-MS

摘要

The reactivity and the role of formate species on ceria-based water-gas shift (WGS, CO + H2O →CO2 + H2) catalysts and the corresponding reaction mechanisms have been much debated. Many of the conflicting conclusions are due to the fact that different materials and experimental conditions were used. In addition, a major source of discrepancy probably resides in the fact that the surface reactivity of adsorbates is often investigated using non-chemical-steady-state methods, leading to erroneous conclusions. In the present work, it is shown that a combination of spectroscopic and kinetic data obtained at the chemical steady-state allows quantification of the concentration of reaction intermediates and excludes the role of the formate species that are visible by DRIFT for a range of catalyst based on Au or Pt supported on reducible oxides.