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Manganese-based catalysts supported on carbon xerogels for the selective catalytic reduction of NOx using a hollow fibre-based reactor

Lookup NU author(s): Leonidas Bekris, Dr Evangelos PapaioannouORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2023 The Authors. As a more compact, affordable and efficient alternative to traditional catalytic converters, catalytic hollow fibre-based reactors have significant potential in addressing the high nitrogen oxides (NOx) emission associated with the combustion of green ammonia. In this work, the performance of a series of manganese (Mn)-based catalysts supported on three different carbon xerogels during the ammonia-selective catalytic reduction (NH3-SCR) reaction was investigated in a packed bed reactor configuration under typical vehicle exhaust gas conditions. The best catalyst candidate Mn-CX, which was associated with the highest NO conversion (i.e. 24% at 225 °C) and highest nitrogen selectivity (i.e. 85% at 225 °C), was deposited in a 7-channelled hollow fibre substrate via a combined sol-gel and incipient wetness impregnation method. At 225 °C and 1 atm, the performance of the hollow fibre-based reactor was enhanced by a factor of four compared to the packed bed reactor (i.e. rO2 = 3300 molO2∙m−3∙h−1∙gcat−1 and rO2 = 810 molO2∙m−3∙h−1∙gcat−1). The superior performance of the hollow fibre-based reactor is attributable to the unique morphology of the hollow fibre substrate, which lends itself to minimised mass transfer limitations. The markedly improved performance of the hollow fibre-based reactor underlines its potential as a technically and economically feasible solution to mitigate the high NOx emissions associated with ammonia combustion. The identification of the catalytic hollow fibre-based reactor as a viable exhaust gas after-treatment technology for green ammonia-fuelled engines, addresses a significant barrier facing the adoption of green ammonia as a carbon-free, future fuel, thereby facilitating the transition to a decarbonised transport sector.

Publication metadata

Author(s): Leishman C, Mazzone S, Sun Y, Bekris L, Papaioannou EI, Li K, Garcia-Garcia FR

Publication type: Article

Publication status: Published

Journal: Catalysis Today

Year: 2023

Volume: 423

Print publication date: 01/11/2023

Online publication date: 27/01/2023

Acceptance date: 26/01/2023

Date deposited: 17/02/2023

ISSN (print): 0920-5861

ISSN (electronic): 1873-4308

Publisher: Elsevier BV

URL: https://doi.org/10.1016/j.cattod.2023.01.026

DOI: 10.1016/j.cattod.2023.01.026

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