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Chemical aging of Cu-SSZ-13 SCR catalysts for heavy-duty vehicles –Influence of sulfur dioxide
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering. (Process Technology)ORCID iD: 0000-0002-5784-6686
Luleå University of Technology, Knightec AB. (Chemical Engineering)
Chalmers University of Technology. (Competence Centre for Catalysis)
Scania CV.
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2018 (English)In: Catalysis Today, ISSN 0920-5861, E-ISSN 1873-4308, Vol. 320, p. 72-83Article in journal (Refereed) Published
Abstract [en]

Selective catalytic reduction of nitrogen oxides is an efficient technique for emission abatement in heavy-dutyvehicles. Cu-SSZ-13 SCR catalysts are more active than vanadium-based catalysts at low temperatures, but aremore sensitive to deactivation by sulfur. Consequently, there is a need to study poisoning by sulfur for thiscatalyst material. This experimental investigation focuses on the effect of sulfur on the low-temperature per-formance of Cu-SSZ-13 SCR catalysts. The effect of sulfur exposure temperature, and the influence of the NO 2 /NO x ratio, are considered and two different regeneration temperatures are compared. In addition, catalystsamples from an engine-aged catalyst are evaluated. The SO 2 exposure temperature is shown to have an im-portant impact on the deactivation of the Cu-SSZ-13 catalyst. The lowest sulfur exposure temperature (220 °C)results in the most severe deactivation, while the highest temperature during sulfur exposure (400 °C) results inthe lowest degree of deactivation. This was found to be related to the amount of sulfur on the catalyst.Additionally, SO 2 exposure was shown to decrease the N 2 O selectivity. The engine-aged catalyst has a decreasedperformance in terms of both decreased activity and increased N 2 O selectivity. For this catalyst, impurities fromfuel and engine-oil can play a role in the deactivation. Different deactivation mechanisms are seen for the lab-and engine-aged catalysts.

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2018. Vol. 320, p. 72-83
Keywords [en]
NH3-SCR, Cu-SSZ-13, Cu-CHA, chemical deactivation, sulfur, heavy-duty vehicles, engine-aging
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-259737DOI: 10.1016/j.cattod.2018.01.035ISI: 000448295200009Scopus ID: 2-s2.0-85044780771OAI: oai:DiVA.org:kth-259737DiVA, id: diva2:1353284
Note

QC 20191011

Available from: 2019-09-22 Created: 2019-09-22 Last updated: 2019-10-15Bibliographically approved

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