Hernández Arango, Pablo Ignacio (2022)
The effect of the gas phase chemistry on the catalytic oxidation of ammonia over platinum.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00020385
Dissertation, Erstveröffentlichung, Verlagsversion

Kurzbeschreibung (Abstract)

Catalytic oxidation of ammonia (NH3) by the Ostwald process for obtaining nitric oxide (NO) and the subsequent production of nitric acid, has been widely studied and implemented. This process is carried out over Platinum (Pt), in which the formation of NO is favored. However, it is remarkable the need to identify possible gas phase reactions that may occur by means of which is increased or inhibited the NO formation. Chemical processes in the gas phase, who implies the species included in the Ostwald process, for instance the homogeneous oxidation of NH3 or the selective non – catalytic reduction of nitrogen oxides (NOX) by NH3, have been reported and implemented. One of the key features of these homogeneous schemes is its reliance on the characteristics of each process variables. Therefore, it is of interest, determining the occurrence of such reactions in the gas phase of Ostwald process for NH3 oxidation. Due to the complexity of the chemical mechanisms of the processes in the gas phase, reduction, and eventual implementation through computational simulation tools is necessary. While catalytic reactions favor the NO formation, the gas phase reactions promote the N2 and N2O formation due to NO reduction. This simulation, will allow to establish the route by which these sub products are formed, reducing the process efficiency, and increasing the environmental impact of the Oswald process. Comparison of results when the pure catalytic process and the coupled catalytic and gas phase processes are simulated, allow to define the effect of the gas phase chemistry over the overall process.

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