University of Oulu

Honkanen, M., Wang, J., Kärkkäinen, M., Huuhtanen, M., Jiang, H., Kallinen, K., … Vippola, M. (2018). Regeneration of sulfur-poisoned Pd-based catalyst for natural gas oxidation. Journal of Catalysis, 358, 253–265.

Regeneration of sulfur-poisoned Pd-based catalyst for natural gas oxidation

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Author: Honkanen, Mari1; Wang, Jianguang2; Kärkkäinen, Marja3;
Organizations: 1Materials Science, Tampere University of Technology, Tampere, Finland
2Physics, Tampere University of Technology, Tampere, Finland
3Environmental and Chemical Engineering, University of Oulu, Oulu, Finland
4Department of Applied Physics, Aalto University, Espoo, Finland
5Dinex Ecocat Oy, Vihtavuori, Finland
6Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4.5 MB)
Persistent link:
Language: English
Published: Elsevier, 2018
Publish Date: 2020-01-04


Sulfur deactivation and regeneration behavior of the Pd/Al₂O₃ catalyst has been investigated via experimental characterization and density functional theory (DFT) simulations. During the sulfur exposure, PdO crystallites grow slightly while bulk Al₂(SO₄)₃ forms on the support. DFT calculations indicate that SOₓ species interact strongly with the catalyst surface making it chemically inactive in agreement with the experimental results. During the regeneration treatment (CH₄ conditions), PdO particles reduce, Al₂(SO₄)₃ is partially removed, and the activity for CH₄ conversion is increased. No full recovery can be observed due to remaining Al₂(SO₄)₃, the formation of encapsulating sulfur species, and the partial reduction of PdO particles. To reoxidize Pd, the catalyst is further regenerated (O₂ conditions). The resulting CH₄ conversion is at the same level than with the regenerated catalyst. Thus, a small amount of Al₂(SO₄)₃ appears to have a stronger effect on the performance than the state of Pd.

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Series: Journal of catalysis
ISSN: 0021-9517
ISSN-E: 1090-2694
ISSN-L: 0021-9517
Volume: 358
Pages: 253 - 265
DOI: 10.1016/j.jcat.2017.12.021
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The Strategic funding tool of TUT Foundation is thanked for funding.
Dataset Reference: Supplementary material:
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http:/