FeOx/Al2O3 catalysts for high-temperature decomposition of N2O under conditions of NH3 oxidation in nitric acid production

0490607 - ÚFCH JH 2019 RIV GB eng J - Journal Article
Sádovská, Galina - Tabor, Edyta - Bernauer, Milan - Sazama, Petr - Fíla, V. - Kmječ, T. - Kohout, J. - Závěta, K. - Tokarová, V. - Sobalík, Zdeněk
FeOx/Al2O3 catalysts for high-temperature decomposition of N2O under conditions of NH3 oxidation in nitric acid production.
Catalysis Science &Technology. Roč. 8, č. 11 (2018), s. 2841-2852. ISSN 2044-4753. E-ISSN 2044-4761
R&D Projects: GA MŠMT(CZ) LM2015073; GA ČR(CZ) GA14-10251S
Institutional support: RVO:61388955
Keywords : mixed oxidic system * maghemite nanoparticles * mossbauer-spectroscopy * fe2o3/al2o3 catalysts * structural-analysis * morin temperature
OECD category: Physical chemistry
Impact factor: 5.726, year: 2018

The catalytic activity of a series of FeOx/Al2O3 prepared under various conditions was evaluated for high temperature decomposition of N2O (HT-deN(2)O) in a complex gas mixture produced by oxidation of ammonia. Thus the relevant step in the industrial nitric acid production process was simulated. The catalyst stability during long-term exposure (12 days) to reaction conditions relevant to HT-deN(2)O was studied. Both fresh and aged FeOx/Al2O3 exhibited more than 90% conversion of N2O in the 750-900 degrees C temperature range. Structural analysis showed that the prepared FeOx/Al2O3 catalysts contained various proportions of , and alumina phases and up to four individual iron species. In the and Al2O3 phases, well stabilized Fe(iii) in T-d or O-h coordination was identified as the active species in HT-deN(2)O.
Permanent Link: http://hdl.handle.net/11104/0284779