Revisiting the nature of Cu sites in the activated Cu-SSZ-13 catalyst for SCR reaction.

ABSTRACT: Cu-SSZ-13 is a highly active NH₃-SCR catalyst for the abatement of harmful nitrogen oxides (NO _x , x = 1, 2) from the exhausts of lean-burn engines. The study of Cu-speciation occurring upon thermal dehydration is a key step for the understanding of the enhanced catalytic properties of this material and for identifying the SCR active sites and their redox capability. Herein, we combined FTIR, X-ray absorption (XAS) and emission (XES) spectroscopies with DFT computational analysis to elucidate the nature and location of the most abundant Cu sites in the activated catalyst. Different Cu species have been found to be dominant as a function of the dehydration temperature and conditions. Data analysis revealed that the dehydration process of Cu cations is ess

SUBMITTER: Borfecchia E 

PROVIDER: S-EPMC5588737 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature