Reaction-driven Ion Exchange of Copper into Zeolite SSZ-13

Research output: Contribution to journalArticle

Abstract

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.

Details

Authors
  • A. K. S. Clemens
  • A. Shishkin
  • P. -A. Carlsson
  • M. Skoglundh
  • Francisco Martinez
  • Zdenek Matej
  • Olivier Balmes
  • H. Harelind
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Inorganic Chemistry

Keywords

  • NH3-SCR, Cu-SSZ-13, diesel exhaust aftertreatment, solid-state, ion-exchange, NOx reduction
Original languageEnglish
Pages (from-to)6209-6218
JournalACS Catalysis
Volume5
Issue number10
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes