Prediction of Cu Zeolite NH₃-SCR Activity from Variable Temperature ¹H NMR Spectroscopy.

ABSTRACT: Selective catalytic reduction (SCR) of NO_x by ammonia is one of the dominant pollution abatement technologies for near-zero NO_x emission diesel engines. A crucial step in the reduction of NO_x to N₂ with Cu zeolite NH₃-SCR catalysts is the generation of a multi-electron donating active site, implying the permanent or transient dimerization of Cu ions. Cu atom mobility has been implicated by computational chemistry as a key factor in this process. This report demonstrates how variable temperature ¹H NMR reveals the Cu induced generation of sharp ¹H resonances associated with a low concentration of sites on the zeolite. The onset temperature of the appearance of these signals was found to strongly correlate with the

SUBMITTER: Radhakrishnan S 

PROVIDER: S-EPMC10537069 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature