Numerical Investigation on the Intraphase and Interphase Mass Transfer Limitations for NH<sub>3</sub>-SCR over Cu-ZSM-5
A systematic modeling approach was scrutinized to develop a kinetic model and a novel monolith channel geometry was designed for NH<sub>3</sub> selective catalytic reduction (NH<sub>3</sub>-SCR) over Cu-ZSM-5. The redox characteristic of Cu-based catalysts and the variations...
Guardado en:
| Autores principales: | , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/792e81a069744b88b0fe5e3d8282956d |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | A systematic modeling approach was scrutinized to develop a kinetic model and a novel monolith channel geometry was designed for NH<sub>3</sub> selective catalytic reduction (NH<sub>3</sub>-SCR) over Cu-ZSM-5. The redox characteristic of Cu-based catalysts and the variations of NH<sub>3</sub>, NO<sub>x</sub> concentration, and NO<sub>x</sub> conversion along the axis in porous media channels were studied. The relative pressure drop in different channels, the variations of NH<sub>3</sub> and NO<sub>x</sub> conversion efficiency were analyzed. The model mainly considers NH<sub>3</sub> adsorption and desorption, NH<sub>3</sub> oxidation, NO oxidation, and NO<sub>x</sub> reduction. The results showed that the model could accurately predict the NH<sub>3</sub>-SCR reaction. In addition, it was found that the Cu-based zeolite catalyst had poor low-temperature catalytic performance and good high-temperature activity. Moreover, the catalytic reaction of NH<sub>3</sub>-SCR was mainly concentrated in the upper part of the reactor. In addition, the hexagonal channel could effectively improve the diffusion rate of gas reactants to the catalyst wall, reduce the pressure drop and improve the catalytic conversion efficiencies of NH<sub>3</sub> and NO<sub>x</sub>. |
|---|