DRIFT/XAS analysis of single-site Pt supported on UiO-66(Ce) for H2 production

In the panorama of H2 production strategies we are currently exploring the water gas shift (WGS) reaction over metal single sites supported on cerium-based UiO-66(Ce). We have recently prepared a Ce3+ rich UiO-66(Ce) catalyst with anchored Pt single sites. The catalyst presented similar catalytic activity than the conventional Pt/CeO2 catalyst at lower temperature (150 vs 50°C). Operando FT-IR and ex-situ Ce L3-edge XAS spectra unveiled a relation between the higher activity and hydrides/formate formation parallel to a higher Ce3+ content. We here propose to measure coupled DRIFT/XAFS spectra under operando conditions to obtain a solid comprehension of the electronic/structural/chemical interaction leading to higher catalytic properties of Pt/UiO-66(Ce) and disclosing the different reaction mechanisms over the two catalysts.