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Structure-sensitivity of alumina supported palladium catalysts for N2O decomposition

Richards, Nia, Carter, James H., Nowicka, Ewa, Parker, Luke A., Pattisson, Samuel, He, Qian ORCID: https://orcid.org/0000-0003-4891-3581, Dummer, Nicholas F. ORCID: https://orcid.org/0000-0002-0946-6304, Golunski, Stanislaw ORCID: https://orcid.org/0000-0001-7980-8624 and Hutchings, Graham J. ORCID: https://orcid.org/0000-0001-8885-1560 2020. Structure-sensitivity of alumina supported palladium catalysts for N2O decomposition. Applied Catalysis B: Environmental 264 , 118501. 10.1016/j.apcatb.2019.118501

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Abstract

The catalytic activity of Pd/γAl2O3 for N2O decomposition was found to be highly dependent on the preparation methodology and the number of reaction cycles. Chloride species on the surface of a 2.6 wt. % Pd-Al2O3 catalyst prepared by wet impregnation were identified as inhibiting the activity. Multiple reaction cycles were shown to remove these species, and a subsequent increase in activity was observed; 10.3 molN2O h−1 kgcat−1 in the first use, increased to 28.7 molN2O h−1 kgcat−1 on the fourth use both at 550 °C. Additionally, removal of physisorbed water from the support prior to metal deposition increased the thermal stability of Pd nanoparticles and increased the catalyst activity. Catalysts were subsequently prepared using a deposition technique with an increased concentration of Cl- ions resulted in increased Pd-Cl species in the final catalyst and the catalytic activity was consequently increased due to the improved control of Pd particle size.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0926-3373
Funders: ERC
Date of First Compliant Deposit: 3 January 2020
Date of Acceptance: 29 November 2019
Last Modified: 22 Apr 2024 18:40
URI: https://orca.cardiff.ac.uk/id/eprint/128182

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