Sulfate residuals on Ru catalysts switch CO₂ reduction from methanation to reverse water-gas shift reaction.

ABSTRACT: Efficient heterogeneous catalyst design primarily focuses on engineering the active sites or supports, often neglecting the impact of trace impurities on catalytic performance. Herein, we demonstrate that even trace amounts of sulfate (SO₄^2-) residuals on Ru/TiO₂ can totally change the CO₂ reduction from methanation to reverse-water gas shift (RWGS) reaction under atmospheric pressure. We reveal that air annealing causes the trace amount of SO₄^2- to migrate from TiO₂ to Ru/TiO₂ interface, leading to the significant changes in product selectivity from CH₄ to CO. Detailed characterizations and DFT calculations show that the sulfate at Ru/TiO₂ interface notably enhances the H transfer

SUBMITTER: Chen M 

PROVIDER: S-EPMC11531589 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature