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

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Per-Anders Carlsson

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

F. J. Martinez-Casado

Lunds Universitet

Z. Matej

Lunds Universitet

O. Balmes

Lunds Universitet

Hanna Härelind

Kompetenscentrum katalys (KCK)

Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

ACS Catalysis

2155-5435 (eISSN)

Vol. 5 6209-6218

Ämneskategorier

Oorganisk kemi

Kemiska processer

Materialkemi

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

DOI

10.1021/acscatal.5b01200