Jump to main content
Jump to site search


Alkali-driven active site shift of fast SCR with NH3 on V2O5–WO3/TiO2 catalyst via a novel Eley–Rideal mechanism

Author affiliations

Abstract

The heterogeneous SCR reaction dynamics, the well-known Eley–Rideal mechanism and the Langmuir–Hinshelwood mechanism are well-understood by most researchers, all involving the adsorption of ammonia as the premise of the whole redox reaction. Alkali species prevent the collision between the acidic V-site and gaseous NH3 molecules and result in serious reactivity losses to the commercial V2O5–WO3/TiO2 catalyst. Yet, in fast SCR reactions, alkali species provide additional basic sites for NO2 adsorption. In contrast to the accepted mechanism, gaseous NH3 molecules were shown to participate in the reaction and react with other adsorbed substances. The active site is transformed and the mechanism shifts to a fast SCR over the poisoned catalyst. This study presents a new strategy to design catalysts for fast SCR processes and deal with alkali metal poisoning issues.

Graphical abstract: Alkali-driven active site shift of fast SCR with NH3 on V2O5–WO3/TiO2 catalyst via a novel Eley–Rideal mechanism

Back to tab navigation

Publication details

The article was received on 08 Aug 2019, accepted on 09 Sep 2019 and first published on 09 Sep 2019


Article type: Paper
DOI: 10.1039/C9CY01565E
Catal. Sci. Technol., 2019, Advance Article

  •   Request permissions

    Alkali-driven active site shift of fast SCR with NH3 on V2O5–WO3/TiO2 catalyst via a novel Eley–Rideal mechanism

    J. Xiang, X. Du, Y. Wan, Y. Chen, J. Ran and L. Zhang, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY01565E

Search articles by author

Spotlight

Advertisements