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  4. Resolving gradients in an ammonia oxidation reactor under industrial conditions: A combined experimental and simulation study
 
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Resolving gradients in an ammonia oxidation reactor under industrial conditions: A combined experimental and simulation study

Publikationstyp
Journal Article
Date Issued
2022-07-01
Sprache
English
Author(s)
Pottbacker, Jan 
Jakobtorweihen, Sven  
Behnecke, Anna-Sophia  
Abdullah, Adnan  
Özdemir, Melis 
Warner, Maximilian  
Menon, Mohan  
Bujalski, Jakub Michał  
Waller, David  
Korup, Oliver  
Horn, Raimund  
Institut
Chemische Reaktionstechnik V-2  
TORE-URI
http://hdl.handle.net/11420/12117
Journal
Chemical engineering journal  
Volume
439
Article Number
135350
Citation
Chemical Engineering Journal 439: 135350 (2022-07-01)
Publisher DOI
10.1016/j.cej.2022.135350
Scopus ID
2-s2.0-85126280589
The industrial production of nitric acid by the Ostwald process is a major emission source of the potent green-house gas nitrous oxide that is formed during the catalytic oxidation of ammonia. A systematic knowledge-based optimization of industrial ammonia oxidation, e.g. with respect to minimizing nitrous oxide formation, is hindered by the limited fundamental process understanding resulting from a lack of experimental insight into the reaction at industrial conditions. Here we bridge this gap of knowledge by resolving concentration and temperature profiles in a bench-scale reactor setup under industrial conditions using capillary profile measurements in combination with detailed CFD simulations. The profile measurement technique has a spatial resolution sufficient to resolve the steep gradients around single catalyst gauze wires. The influence of the sampling orifice diameter and reaction conditions on the sampling region and the resulting spatial resolution is discussed. The importance of the sampling orifice to gauze positioning in order to measure well averaged concentration profiles is shown. A comparison of simulated and experimental profiles demonstrates that the most widely used surface mechanism in CFD simulations of ammonia oxidation, the Kraehnert and Baerns model, shows the correct trends but cannot capture the product distribution quantitatively. The approach presented in this article provides detailed experimental insight into ammonia oxidation under industrial conditions required to develop and validate future kinetic models for knowledge-based optimization of industrial ammonia oxidation.
Subjects
Ammonia oxidation
CFD simulations
Gauze catalyst
Ostwald process
Platinum
Spatial profile measurements
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