Reaction-driven Ion Exchange of Copper into Zeolite SSZ-13
Artikel i vetenskaplig tidskrift, 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
Författare
Anna Clemens
Chalmers, Teknisk fysik, Kemisk fysik
Alexander Shishkin
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Kompetenscentrum katalys (KCK)
Per-Anders Carlsson
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Kompetenscentrum katalys (KCK)
Magnus Skoglundh
Kompetenscentrum katalys (KCK)
Chalmers, Kemi och kemiteknik, Tillämpad kemi
F. J. Martinez-Casado
Lunds Universitet
Z. Matej
Lunds Universitet
O. Balmes
Lunds Universitet
Hanna Härelind
Kompetenscentrum katalys (KCK)
Chalmers, Kemi och kemiteknik, Tillämpad kemi
ACS Catalysis
2155-5435 (eISSN)
Vol. 5 10 6209-6218Ämneskategorier (SSIF 2011)
Oorganisk kemi
Kemiska processer
Materialkemi
Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
DOI
10.1021/acscatal.5b01200