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Spatially Resolved Measurements in a Stagnation‐Flow Reactor: Kinetics of Catalytic NH3 Decomposition.

Authors :
Davari, Sadaf
Cárdenas, Camilo
Hettel, Matthias
Lott, Patrick
Tischer, Steffen
Angeli, Sofia
Deutschmann, Olaf
Source :
Chemie Ingenieur Technik (CIT); Dec2024, Vol. 96 Issue 12, p1735-1750, 16p
Publication Year :
2024

Abstract

A stagnation‐flow reactor was employed to investigate the decomposition of ammonia over a Ni/Al2O3 catalyst across a range of system pressures and ammonia mole fractions. The results indicate that the system pressure has a negligible impact on the light‐off behavior and the concentration profiles of NH₃. A comparison of 1D modelling with 3D computational fluid dynamics (CFD) computations justifies the use of the simpler flow model. Good agreement between experiments and the 1D simulation is achieved for two different kinetic models from literature in the mainly diffusion‐controlled regime. For lower temperatures, at which the process is kinetically controlled, the two mechanisms exhibit significant differences. The stagnation‐flow reactor concept is shown to be a promising tool for understanding, developing, and validating the reaction kinetics of heterogeneous catalytic processes. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0009286X
Volume :
96
Issue :
12
Database :
Complementary Index
Journal :
Chemie Ingenieur Technik (CIT)
Publication Type :
Academic Journal
Accession number :
181088799
Full Text :
https://doi.org/10.1002/cite.202400100