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20.07.2021 | Original Article

Synergistic effect of cobalt and niobium in Co₃-Nb-O_x on performance of selective catalytic reduction of NO with NH₃

verfasst von: Bo-Lin Zhang, Li-Feng Deng, Bo Liu, Chun-Yun Luo, Michael Liebau, Shen-Gen Zhang, Roger Gläser

Erschienen in: Rare Metals | Ausgabe 1/2022

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Abstract

Combining the redox properties of Co and the acid properties of Nb in a Co₃-Nb-O_x catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH₃ (NH₃-SCR). Co₃O₄ shows average activity, however, it exhibits a poor N₂ selectivity. Nb₂O₅ is not active for NH₃-SCR. However, the mixed Co₃-Nb-O_x catalyst shows higher NO conversion and N₂ selectivity than the single Co₃O₄ and Nb₂O₅ catalysts at 100–300 °C. The results of temperature programmed reduction by H₂ and X-ray photoelectron (XP) spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co³⁺ and O_α, adjusting the activity for catalytic oxidation to a moderate level. This suppresses the formation of undesired N₂O from the over-oxidation of NH₃. Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity, ensuring the high catalytic activity and N₂ selectivity in NH₃-SCR.

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Vorheriger Artikel Comparative study of metal oxides and phosphate modification with different mechanisms over g-C3N4 for visible-light photocatalytic degradation of metribuzin

Nächster Artikel Increasing ionic conductivity in Li0.33La0.56TiO3 thin-films via optimization of processing atmosphere and temperature

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Titel: Synergistic effect of cobalt and niobium in Co3-Nb-Ox on performance of selective catalytic reduction of NO with NH3
verfasst von: Bo-Lin Zhang
Li-Feng Deng
Bo Liu
Chun-Yun Luo
Michael Liebau
Shen-Gen Zhang
Roger Gläser
Publikationsdatum: 20.07.2021
Verlag: Nonferrous Metals Society of China
Erschienen in: Rare Metals / Ausgabe 1/2022
Print ISSN: 1001-0521
Elektronische ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-021-01790-5

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