Regeneration of sulfur-poisoned Cu-SSZ-13 catalysts: Copper speciation and catalytic performance evaluation
Journal article, 2021

Regeneration of a sulfur-poisoned Cu-SSZ-13 catalyst via a temperature ramp in an inert atmosphere with subsequent holding under oxidizing conditions at 500 °C restores significant activity for NOx conversion under standard, fast, and NO2-rich SCR conditions. The N2O selectivity of the regenerated catalyst is higher than for the fresh catalyst under NO2-rich SCR conditions at 280 °C, while the opposite was observed for the standard and fast SCR conditions. Analysis of copper speciation showed that sulfur-free Cu species have different condition-dependent behavior in the fresh and regenerated catalysts. Heating the poisoned catalyst in an oxidizing atmosphere transforms a portion of ammonium sulfates into stable metal sulfates, while heating under inert or reducing conditions leads to more effective desulfation without the formation of stable metal sulfates. Reducing conditions result in desulfation at lower temperatures compared to inert conditions. These results contribute to the further development of regeneration strategies for Cu-SSZ-13 catalysts.

DeSO x

Cu-CHA

N O selectivity 2

NH -SCR 3

NO /NO ratio 2 x

Author

Vitaly V. Mesilov

Yale NUS College

Sandra Dahlin

Dahlin Catalytics

Scania CV AB

Royal Institute of Technology (KTH)

Susanna L. Bergman

Yale NUS College

Shibo Xi

Institute of Chemical and Engineering Sciences, A-Star, Singapore

Joonsoo Han

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Lars Pettersson

Royal Institute of Technology (KTH)

Steven L. Bernasek

Yale NUS College

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 299 120626

Subject Categories

Chemical Process Engineering

Other Chemical Engineering

Organic Chemistry

DOI

10.1016/j.apcatb.2021.120626

More information

Latest update

9/16/2021