Sulfation effect of Ce/TiO₂ catalyst for the selective catalytic reduction of NO _x with NH₃: mechanism and kinetic studies.

ABSTRACT: Ceria-based catalysts are competitive substitutes for the commercial SCR catalysts due to their high SCR activity and excellent redox performance. For a better understanding of the SO₂ poisoning mechanism over ceria-based catalysts, the sulfation effect of the Ce/TiO₂ catalyst on the SCR activity over a wide reaction temperature range was systematically studied via comprehensive characterizations, in situ DRIFT studies and kinetic studies. The results demonstrated that the NO conversion at 150 °C is significantly inhibited by the formation of cerium sulfites/sulfates due to the inhibited redox properties and excessive adsorption of NH₃, which restrict the dissociation of NH₃ to NH₂, resulting in a much lower reaction rate

SUBMITTER: Zhang W 

PROVIDER: S-EPMC9072935 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature