H2-SCR of NOx on low-SSA CeO2-supported Pd: The effect of Pd particle size

H2-SCR of NOx on low-SSA CeO2-supported Pd: The effect of Pd particle size

[Display omitted] •H2-SCR is strongly promoted on small Pd particles supported on a low-SSA CeO2.•TOF (s−1) is significantly reduced with increasing Pd particle size in the 13−45 nm range.•Concentration of active NOx-s correlates with the specific rate of H2-SCR as a function of dPd.•The effect of H...

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Bibliographic Details
Published in:Applied catalysis. A, General Vol. 615; p. 118062
Main Authors: Savva, Zena, Petallidou, Klito C., Damaskinos, Constantinos M., Olympiou, George G., Stathopoulos, Vassilis N., Efstathiou, Angelos M.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 05-04-2021
Elsevier Science SA
Subjects:
Ceria
Cerium oxides
Conversion
H2-SCR
Integrals
NOx reduction
Palladium
Particle size
Pd/CeO2 catalyst
Selectivity
Transient NOx reduction by H2
Pd/CeO2 catalyst
Transient NOx reduction by H2
H2-SCR
NOx reduction
Ceria
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Summary:[Display omitted] •H2-SCR is strongly promoted on small Pd particles supported on a low-SSA CeO2.•TOF (s−1) is significantly reduced with increasing Pd particle size in the 13−45 nm range.•Concentration of active NOx-s correlates with the specific rate of H2-SCR as a function of dPd.•The effect of H2O on NO-conversion depends on Pd particle size and reaction temperature.•An inverse volcano-type profile of XNO vs T (130−220 °C) in the H2-SCR on Pd/CeO2 independent of dPd. The H2-SCR of NO was investigated in the 130−220 °C range over low-SSA CeO2-supported Pd of varying particle size, dPd (ca. 13−45 nm). Relationships were derived between dPd and the specific integral rate (per gram of Pd or length of metal-support interface), NO conversion, N2-selectivity, TOFNO and the concentration of active NOx-s. The large enhancement in the rate of NO conversion per gram of Pd metal over the small Pd particles was found to be largely related to the increase in the concentration of active NOx formed within a zone around the Pd-ceria interface and the rate of H-spillover. The effect of H2O on the integral rate and N2-selectvity as a function of dp (nm) was also investigated.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2021.118062