Insights into sulfur poisoning and regeneration of Cu-SSZ-13 catalysts: in situ Cu and S K-edge XAS studies

Autor: Steven L. Bernasek, Peter S. Hammershøi, Sandra Dahlin, Susanna L. Bergman, V. V. Mesilov, Shibo Xi, Lars J. Pettersson

Publikováno v: Catalysis Science & Technology. 11:5619-5632

In situ Cu and S K-edge X-ray absorption spectroscopy (XAS) was used for the investigation of sulfur-poisoned and regenerated Cu-SSZ-13 selective catalytic reduction (SCR) catalysts. Highly dispersed sulfur in the oxidation state +6 was found in the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::27d3203003cfc2e517ede26cc78a1d94
https://doi.org/10.1039/d1cy00975c

Temperature-programmed reduction with NO as a characterization of active Cu in Cu-CHA catalysts for NH3-SCR

Autor: Silvia Bordiga, Peter S. Hammershøi, Pablo Beato, Chiara Negri, Gloria Berlier, Ton V. W. Janssens

Publikováno v: Catalysis Science & Technology. 9:2608-2619

Temperature programmed reduction with NO (NO-TPR) is introduced as a characterization method, by monitoring the reduction of CuII to CuI in a mixture of NH3 and NO. Since the NO-TPR method is based on the oxidation and reduction half cycles of the NH

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea1bd3735821f4433bea890b07abd5f7
https://doi.org/10.1039/c9cy00358d

Reversible and irreversible deactivation of Cu-CHA NH3-SCRcatalysts by SO2 and SO3

Autor: Yasser Jangjou, Peter S. Hammershøi, William S. Epling, Ton V. W. Janssens, Anker Degn Jensen

Publikováno v: Hammershøi, P S, Jangjou, Y, Epling, W S, Jensen, A D & Janssens, T V W 2018, ' Reversible and irreversible deactivation of Cu-CHA NH 3-SCR catalysts by SO 2 and SO 3 ', Applied Catalysis B: Environmental, vol. 226, pp. 38–45 . https://doi.org/10.1016/j.apcatb.2017.12.018

Sulfur oxides are a common source for the deactivation of Cu-exchanged CHA zeolite based catalysts used for NOx reduction in diesel exhausts by selective catalytic reduction with NH3 (NH3-SCR). Since water and possible formation of SO3 affect the dea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6257e65cb3c4ce673936ff4ec84df04c
https://doi.org/10.1016/j.apcatb.2017.12.018

Importance of the Cu oxidation state for the SO2-poisoning of a Cu-SAPO-34 catalyst in the NH3-SCR reaction

Autor: Anker Degn Jensen, Hanne Falsig, Ton V. W. Janssens, Peter S. Hammershøi, Peter N. R. Vennestrøm

Publikováno v: Hammershøi, P S, Vennestrøm, P N R, Falsig, H, Jensen, A D & Janssens, T V W 2018, ' Importance of the Cu oxidation state for the SO 2-poisoning of a Cu-SAPO-34 catalyst in the NH 3-SCR reaction ', Applied Catalysis B: Environmental, vol. 236, pp. 377-383 . https://doi.org/10.1016/j.apcatb.2018.05.038

Cu-exchanged zeolites of the CHA structure are state-of-the-art catalysts for selective catalytic reduction of NOx with NH3 in diesel aftertreatment systems. However, these catalysts deactivate in the presence of SO2, which is a constituent of diesel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2516529a3be8da7ea9766189fe542498
https://orbit.dtu.dk/en/publications/cb92d705-9c04-43f6-b7b2-dc399b37ad59