Insight into the SO2 poisoning mechanism for NOx removal by NH3-SCR over Cu/LTA and Cu/SSZ-13
Journal article, 2020

In this study, Cu/LTA and Cu/SSZ-13 catalysts are examined for sulfur poisoning and regeneration. The nature of the Cu species was probed with H2-TPR and in-situ DRIFTS. These characterizations collectively indicate that primarily Z2Cu is present in Cu/LTA, whereas Cu/SSZ-13 contains a higher concentration of ZCuOH. ZCuOH is proved to be more vulnerable to SO2 poisoning than Z2Cu sites in both Cu/zeolites. H2-TPR results suggest that the interaction of ZCuOH with the framework in Cu/LTA is much weaker than in Cu/SSZ-13, thereby leading to more susceptibility to SO2 adsorption. Moreover, Cu/LTA can store more SO2 under NH3-SCR conditions in the presence of SO2, and it also has a slower deactivation rate due to the different location of generated (NH4)2SO4. Cu/LTA can be fully restored after regeneration at 750 °C. However, Cu/SSZ-13 experiences a loss of activity at high temperature, which is attributed to newly formed CuOx clusters.

Fast SCR

LTA

Cu

Standard SCR

SSZ-13

SO 2

Author

Aiyong Wang

Competence Centre for Catalysis (KCK)

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

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Competence Centre for Catalysis (KCK)

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 395 125048

Subject Categories

Inorganic Chemistry

Other Chemistry Topics

DOI

10.1016/j.cej.2020.125048

More information

Latest update

2/8/2021 4