Issue 8, 2024

Experimental investigation of mass transfer and pressure drop in NH3 SCR over self-supporting Cu-ZSM-5 foam

Abstract

Selective catalytic reduction of NOx by NH3 is an emerging technology for emission control applications worldwide. The development of structured catalysts for process intensification is of growing interest in catalytic processes due to heat and mass transfer limitations at an industrial scale. Self supported foam catalysts have increased active phase load in the structured reactor, without additional weight, reactor volume and pressure drop. The successful development of a self-supported catalyst could provide a ready-to-use material without the need of washcoating steps. A self supporting Cu-ZSM-5 foam catalyst is developed for NH3 selective catalytic reduction (SCR) with high mechanical strength using an emulsion freeze casting method using hydrogenated vegetable oil as the oil phase and Cu-ZSM-5 slurry as the water phase. A comprehensive experimental study was conducted to understand the mass transfer and pressure drop characteristics of the foam catalysts. Correlations for the mass transfer coefficient and friction factor were derived for the foam catalyst and validated against the available data in the literature reviewed. A detailed investigation of key SCR reactions, NOx storage and thermal stability and the inhibitory effects of feed gases, are carried out in this research. NOx adsorption–desorption studies reveal that the presence of NO reduces the storage and thermal stability of stored nitrate in Cu-ZSM-5. Nitrate formation has an inhibition effect on NO oxidation and standard SCR due to the competitive adsorption.

Graphical abstract: Experimental investigation of mass transfer and pressure drop in NH3 SCR over self-supporting Cu-ZSM-5 foam

Article information

Article type
Paper
Submitted
10 Oct 2023
Accepted
04 Apr 2024
First published
23 Apr 2024

React. Chem. Eng., 2024,9, 2120-2134

Experimental investigation of mass transfer and pressure drop in NH3 SCR over self-supporting Cu-ZSM-5 foam

R. Raju, P. K., K. Joseph and A. Salih, React. Chem. Eng., 2024, 9, 2120 DOI: 10.1039/D3RE00533J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements