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Kinetic Modelling of the Adsorption and Desorption of NH3 on Fe/BEA Zeolite

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Published/Copyright: January 22, 2015
Zeitschrift für Physikalische Chemie
From the journal Zeitschrift für Physikalische Chemie Volume 229 Issue 5

Abstract

This paper deals with the kinetic modelling of the adsorption and desorption of NH3 on Fe/BEA zeolite. Fe/BEA was recently reported to show high activity for the selective catalytic reduction (SCR) of NOx by NH3. The NH3 adsorption and desorption kinetics was examined in the temperature range from 323 to 923 K using temperature programmed desorption of NH3 (NH3-TPD) and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS). With these investigations an elementary kinetic mean field model of the NH3 adsorption and desorption was constructed employing Arrhenius-based rate expressions. The model differentiated molecularly bound NH3 and NH4+ surface species originated from the NH3 chemisorption. For both kinds of species, the kinetic parameters of the adsorption of NH3 were adopted from the literature, while that of the desorption were numerically fitted based upon NH3-TPD traces. The reliability of the kinetic model was evidenced by reproduction and prediction of the NH3-TPD profiles as well as thermodynamic consistency.

Keywords: Kinetic Modelling; NH3 Adsorption/Desorption Kinetics; Fe/BEA Zeolite; Heterogeneous Catalysis; Selective Catalytic Reduction

Acknowledgement

The authors acknowledge thankfully the financial support by the European Social Fund (DynMo, SAB project 100113147) and the Federal Ministry of Education and Research (Nano-SCR, PTJ project 03X0079D). The supply of zeolite samples by NanoScape is also acknowledged with gratitude.

Received: 2014-9-3
Accepted: 2014-12-15
Published Online: 2015-1-22
Published in Print: 2015-5-28

©2015 Walter de Gruyter Berlin/Boston

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https://doi.org/10.1515/zpch-2014-0607
Keywords for this article
Kinetic Modelling; NH3 Adsorption/Desorption Kinetics; Fe/BEA Zeolite; Heterogeneous Catalysis; Selective Catalytic Reduction

Articles in the same Issue

  1. Frontmatter
  2. Preface
  3. Congratulations to Henning Bockhorn
  4. On Predicting Char Burnout in Pulverized Coal Combustion
  5. A Numerical Study of the Flame Stabilization Mechanism Being Determined by Chemical Reaction Rates Submitted to Heat Transfer Processes
  6. Experimental and Theoretical Investigation of the Flashback of a Swirling, Bluff-Body Stabilised, Premixed Flame
  7. Ab initio Variational Transition State Theory and Master Equation Study of the Reaction (OH)3SiOCH2 + CH3 ⇌ (OH)3SiOC2H5
  8. Mass Transfer Effects in Stagnation Flows on a Porous Catalyst: Water-Gas-Shift Reaction Over Rh/Al2O3
  9. Kinetic Modelling of the Adsorption and Desorption of NH3 on Fe/BEA Zeolite
  10. An Experimental and Kinetic Modeling Study of Premixed Laminar Flames of Methyl Pentanoate and Methyl Hexanoate
  11. A Standard Burner for High Pressure Laminar Premixed Flames: Detailed Soot Diagnostics
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