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Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen

Copper oxide supported on a biochar could suffer from a low nitrogen-selectivity and carbon combustion, despite the sustainability prospect it provides in replacing the utilization of non-renewable materials as the catalyst support to reduce nitric oxide. Bimetallic catalysis is a means to improve c...

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Main Authors: Ibrahim, Yakub, Khairul Anwar, Mohamad Said, Rubiyah, Baini, Mohamed Afizal, Mohamed Amin
Format: Article
Language:English
Published: Springer Nature 2024
Subjects:
TP Chemical technology
Online Access:http://ir.unimas.my/id/eprint/44503/1/s43153-024-00453-z
http://ir.unimas.my/id/eprint/44503/
https://link.springer.com/article/10.1007/s43153-024-00453-z
https://doi.org/10.1007/s43153-024-00453-z
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spelling my.unimas.ir.445032024-03-27T01:46:02Z http://ir.unimas.my/id/eprint/44503/ Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen Ibrahim, Yakub Khairul Anwar, Mohamad Said Rubiyah, Baini Mohamed Afizal, Mohamed Amin TP Chemical technology Copper oxide supported on a biochar could suffer from a low nitrogen-selectivity and carbon combustion, despite the sustainability prospect it provides in replacing the utilization of non-renewable materials as the catalyst support to reduce nitric oxide. Bimetallic catalysis is a means to improve catalytic properties including conversion and selectivity. Therefore, this work investigates the enhancement of carbon-supported copper oxides in nitric oxide selective reduction using hydrogen by co-impregnating iron or manganese with copper. The bimetallic catalysts were prepared via sequential incipient wetness method where copper oxide was impregnated and calcined prior to the impregnation and calcination of the co-catalyst. As iron was paired with copper, the nitrogen selectivity was enhanced by 20% (almost 100% selective) at 200 °C while reducing the carbon combustion rate by 20% at a higher temperature (300 °C). This improvement was regarded as the synergistic effects obtained by the bimetallic oxide catalysts as a result of the altered elemental composition (from 60% carbon content to 50%), catalyst acidity (from 12 mmol NH3 desorbed/g to 16 mmol NH3d/g) and redox properties (from 5 mmol H2 consumed/g to 3 mmol H2/g). Flash elemental analyser showed that this catalyst has lower carbon content but higher oxygen amount (30% compared to 19%) which is correlated to the higher acidic sites, as confirmed via temperature-programmed desorption analysis and Fourier-Transform infra-red spectroscopy. Varying the ratio between the two catalysts revealed that different mechanisms govern the reaction that could be the key to understanding the enhancement of the nitrogen-selectivity. Nevertheless, further studies are required to ensure the applicability of this catalytic system in the industry. Springer Nature 2024 Article PeerReviewed text en http://ir.unimas.my/id/eprint/44503/1/s43153-024-00453-z Ibrahim, Yakub and Khairul Anwar, Mohamad Said and Rubiyah, Baini and Mohamed Afizal, Mohamed Amin (2024) Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen. Brazilian Journal of Chemical Engineering. ISSN 0104-6632 https://link.springer.com/article/10.1007/s43153-024-00453-z https://doi.org/10.1007/s43153-024-00453-z
institution Universiti Malaysia Sarawak
building Centre for Academic Information Services (CAIS)
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Sarawak
content_source UNIMAS Institutional Repository
url_provider http://ir.unimas.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Ibrahim, Yakub
Khairul Anwar, Mohamad Said
Rubiyah, Baini
Mohamed Afizal, Mohamed Amin
Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
description Copper oxide supported on a biochar could suffer from a low nitrogen-selectivity and carbon combustion, despite the sustainability prospect it provides in replacing the utilization of non-renewable materials as the catalyst support to reduce nitric oxide. Bimetallic catalysis is a means to improve catalytic properties including conversion and selectivity. Therefore, this work investigates the enhancement of carbon-supported copper oxides in nitric oxide selective reduction using hydrogen by co-impregnating iron or manganese with copper. The bimetallic catalysts were prepared via sequential incipient wetness method where copper oxide was impregnated and calcined prior to the impregnation and calcination of the co-catalyst. As iron was paired with copper, the nitrogen selectivity was enhanced by 20% (almost 100% selective) at 200 °C while reducing the carbon combustion rate by 20% at a higher temperature (300 °C). This improvement was regarded as the synergistic effects obtained by the bimetallic oxide catalysts as a result of the altered elemental composition (from 60% carbon content to 50%), catalyst acidity (from 12 mmol NH3 desorbed/g to 16 mmol NH3d/g) and redox properties (from 5 mmol H2 consumed/g to 3 mmol H2/g). Flash elemental analyser showed that this catalyst has lower carbon content but higher oxygen amount (30% compared to 19%) which is correlated to the higher acidic sites, as confirmed via temperature-programmed desorption analysis and Fourier-Transform infra-red spectroscopy. Varying the ratio between the two catalysts revealed that different mechanisms govern the reaction that could be the key to understanding the enhancement of the nitrogen-selectivity. Nevertheless, further studies are required to ensure the applicability of this catalytic system in the industry.
format Article
author Ibrahim, Yakub
Khairul Anwar, Mohamad Said
Rubiyah, Baini
Mohamed Afizal, Mohamed Amin
author_facet Ibrahim, Yakub
Khairul Anwar, Mohamad Said
Rubiyah, Baini
Mohamed Afizal, Mohamed Amin
author_sort Ibrahim, Yakub
title Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
title_short Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
title_full Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
title_fullStr Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
title_full_unstemmed Enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
title_sort enhancing the catalytic properties of a biochar-supported copper oxide in nitric oxide selective reduction with hydrogen
publisher Springer Nature
publishDate 2024
url http://ir.unimas.my/id/eprint/44503/1/s43153-024-00453-z
http://ir.unimas.my/id/eprint/44503/
https://link.springer.com/article/10.1007/s43153-024-00453-z
https://doi.org/10.1007/s43153-024-00453-z
_version_ 1795018701774258176
score 13.211869

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