Polymeric vanadyl species determine the low-temperature activity of V-based catalysts for the SCR of NO _x with NH₃.

ABSTRACT: The structure of dispersed vanadyl species plays a crucial role in the selective catalytic reduction (SCR) of NO with NH₃ over vanadia-based catalysts. Here, we demonstrate that the polymeric vanadyl species have a markedly higher NH₃-SCR activity than the monomeric vanadyl species. The coupling effect of the polymeric structure not only shortens the reaction pathway for the regeneration of redox sites but also substantially reduces the overall reaction barrier of the catalytic cycle. Therefore, it is the polymeric vanadyl species, rather than the monomeric vanadyl species, that determine the NH₃-SCR activity of vanadia-based catalysts, especially under low-temperature conditions. The polymeric vanadia-based SCR mechanism reported here advances the understa

SUBMITTER: He G 

PROVIDER: S-EPMC6269159 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature