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Topics in Catalysis
Erschienen in: Topics in Catalysis 10-12/2016

11.05.2016 | Original Paper

Effect of Alkali Promoters (K) on Nitrous Oxide Abatement Over Ir/Al2O3 Catalysts

verfasst von: E. Papista, E. Pachatouridou, M. A. Goula, G. Ε. Marnellos, E. Iliopoulou, M. Konsolakis, I. V. Yentekakis

Erschienen in: Topics in Catalysis | Ausgabe 10-12/2016

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Abstract

The promoting impact of potassium (0–1 wt% K) on nitrous oxide (N2O) catalytic decomposition over Ir/Al2O3 is investigated under both oxygen deficient and oxygen excess conditions. All samples were characterized by means of X-ray powder diffraction (XRD), temperature-programmed reduction (H2-TPR), ammonia desorption (NH3-TPD) and Fourier Transform Infrared Spectroscopy of pyridine adsorption (FTIR-Pyridine). The results reveal that the K-free Ir/Al2O3 catalyst consists mainly of the IrO2 phase, exhibiting also significant Lewis acidity, which is gradually eliminated by the addition of K. Catalytic performance results showed that the deN2O performance in the absence of O2 in the feed mixture is negatively affected upon increasing potassium loading. However, under oxygen excess conditions, a pronounced effect of K is observed. Although the catalytic performance of the un-doped catalyst is drastically hindered by the presence of O2, the K-promotion notably prohibits the oxygen poisoning. The optimum deN2O performance under oxygen excess conditions is obtained with potassium loading of 0.5 wt% K, which offers complete conversion of N2O at 580 °C, instead of the corresponding 50 % N2O conversion achieved with the un-modified sample. On the basis of characterization results, it was concluded that alkali-doping in combination with oxygen excess conditions are required towards the formation of active Ir entities.
Vorheriger Artikel Investigation of the Impact of Calcium, Zinc and Phosphorus on DeNOx Activity of a Commercial SCR Catalyst
Nächster Artikel Sulfur Poisoning of a Pt/Al2O3 Oxidation Catalyst: Understanding of SO2, SO3 and H2SO4 Impacts

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Metadaten
Titel
Effect of Alkali Promoters (K) on Nitrous Oxide Abatement Over Ir/Al2O3 Catalysts
verfasst von
E. Papista
E. Pachatouridou
M. A. Goula
G. Ε. Marnellos
E. Iliopoulou
M. Konsolakis
I. V. Yentekakis
Publikationsdatum
11.05.2016
Verlag
Springer US
Erschienen in
Topics in Catalysis / Ausgabe 10-12/2016
Print ISSN: 1022-5528
Elektronische ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-016-0584-0

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