Reaction-driven Ion Exchange of Copper into Zeolite SSZ-13
Journal article, 2015
We have used several techniques to characterize Cu-SSZ-13 before and after exposure to reaction conditions relevant for NO reduction by NH3-SCR to address the increase in NH3-SCR activity observed as a function of time on stream. Specifically, we focus on characterizing copper species in samples prepared with solid state ion exchange (SSIE) having varying Cu loadings from 0.7 to 5.2 wt %. X-ray diffraction shows that CuO species that likely remain from the SSIE synthesis on the outside of the zeolite crystallites are significantly reduced by exposure to reaction conditions. High-resolution X-ray diffraction (HR-XRD) further reveals a corresponding increase of Cu2O species. X-ray photoelectron, Auger electron, and ultraviolet -visible spectroscopy show an increase in both Cu(II) and Cu(I) species inside the zeolite pores, with a preserved long-range order of the zeolite structure as revealed by HR-XRD.
NOx reduction
solid-state ion-exchange
diesel exhaust aftertreatment
NH3-SCR
Cu-SSZ-13
Author
Anna Clemens
Chalmers, Applied Physics, Chemical Physics
Alexander Shishkin
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Competence Centre for Catalysis (KCK)
Per-Anders Carlsson
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Competence Centre for Catalysis (KCK)
Magnus Skoglundh
Competence Centre for Catalysis (KCK)
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
F. J. Martinez-Casado
Lunds Universitet
Z. Matej
Lunds Universitet
O. Balmes
Lunds Universitet
Hanna Härelind
Competence Centre for Catalysis (KCK)
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
ACS Catalysis
2155-5435 (eISSN)
Vol. 5 10 6209-6218Subject Categories (SSIF 2011)
Inorganic Chemistry
Chemical Process Engineering
Materials Chemistry
Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
DOI
10.1021/acscatal.5b01200