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Kinetics of ammonia oxidation over Pt foil studied in a micro-structured quartz-reactor

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Baerns,  Manfred
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Kraehnert, R., & Baerns, M. (2008). Kinetics of ammonia oxidation over Pt foil studied in a micro-structured quartz-reactor. Chemical Engeneering Journal, 137(2), 361-375. Retrieved from http://dx.doi.org/10.1016/j.cej.2007.05.005.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-FD29-F
Abstract
The kinetics of Pt-catalyzed ammonia oxidation on polycrystalline Pt were investigated at partial pressures of ammonia and oxygen up to 6 kPa and temperatures between 286 and 385 °C, applying a micro-structured reactor that ascertained temperature control of the exothermic reaction. Using literature-based mechanistic models, a micro-kinetic model was derived based on parameter optimization and a model discrimination procedure. The model described the rates of formation of all nitrogen-containing products, i.e. N2, N2O and NO. Catalyst characterization of platinum samples by electron microscopy indicated that reaction-induced restructuring of the Pt surface limited the accuracy of derived kinetic parameters already at the low temperature applied in this work. Despite of necessary simplifications, the best-fitting kinetic model predicted reasonable product selectivities for the reaction conditions of an industrial ammonia burner.