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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, Dummer, Nicholas F., Golunski, Stanislaw and Hutchings, Graham J. 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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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: 28 Aug 2022 18:07

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