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Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect
In this study, microwave-assisted ammonia decomposition reaction was investigated over molybdenum incorporated catalysts. Due to the selective, volumetric, and noncontact heating properties of the microwave system, higher conversion values could be achieved at relatively lower reaction temperatures,...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Scientific and Technological Research Council of Turkey
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7668040/ https://www.ncbi.nlm.nih.gov/pubmed/33488159 http://dx.doi.org/10.3906/kim-1907-4 |
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author | GÜLER, Melih VARIŞLI, Dilek |
author_facet | GÜLER, Melih VARIŞLI, Dilek |
author_sort | GÜLER, Melih |
collection | PubMed |
description | In this study, microwave-assisted ammonia decomposition reaction was investigated over molybdenum incorporated catalysts. Due to the selective, volumetric, and noncontact heating properties of the microwave system, higher conversion values could be achieved at relatively lower reaction temperatures, which is important for on-site COx-free hydrogen production. Multiwall carbon nanotube-supported molybdenum catalysts were prepared following the impregnation procedure with different metal loading (3.5%–12.5% wt%), and inductively coupled plasma, nitrogen physisorption, X-ray diffraction, and transmission electron microscopic techniques were employed to characterize the fresh and used samples. Reaction experiments were performed under the flow of pure ammonia with a gas hourly space velocity of 36,000 mL/g(cat.)h for both the microwave and conventionally heated reaction systems. It was found that ammonia conversion was obtained even at 400 °C, reaching 40%, and total conversion was observed even at 450 °C, while the activities of these catalysts were negligible at a reaction temperature lower than 550 °C, in the conventional heated system, which included an electrically heated furnace. Crystals of α-Mo(2)C as well as MoO(2) were observed in the structures of the synthesized catalysts and the formation of nitride species was more easily observable under microwave heating, possibly due to the nitridation of molybdenum carbide species during the reaction. |
format | Online Article Text |
id | pubmed-7668040 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | The Scientific and Technological Research Council of Turkey |
record_format | MEDLINE/PubMed |
spelling | pubmed-76680402021-01-22 Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect GÜLER, Melih VARIŞLI, Dilek Turk J Chem Article In this study, microwave-assisted ammonia decomposition reaction was investigated over molybdenum incorporated catalysts. Due to the selective, volumetric, and noncontact heating properties of the microwave system, higher conversion values could be achieved at relatively lower reaction temperatures, which is important for on-site COx-free hydrogen production. Multiwall carbon nanotube-supported molybdenum catalysts were prepared following the impregnation procedure with different metal loading (3.5%–12.5% wt%), and inductively coupled plasma, nitrogen physisorption, X-ray diffraction, and transmission electron microscopic techniques were employed to characterize the fresh and used samples. Reaction experiments were performed under the flow of pure ammonia with a gas hourly space velocity of 36,000 mL/g(cat.)h for both the microwave and conventionally heated reaction systems. It was found that ammonia conversion was obtained even at 400 °C, reaching 40%, and total conversion was observed even at 450 °C, while the activities of these catalysts were negligible at a reaction temperature lower than 550 °C, in the conventional heated system, which included an electrically heated furnace. Crystals of α-Mo(2)C as well as MoO(2) were observed in the structures of the synthesized catalysts and the formation of nitride species was more easily observable under microwave heating, possibly due to the nitridation of molybdenum carbide species during the reaction. The Scientific and Technological Research Council of Turkey 2020-04-01 /pmc/articles/PMC7668040/ /pubmed/33488159 http://dx.doi.org/10.3906/kim-1907-4 Text en Copyright © 2020 The Author(s) This article is distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0/ ), which permits unrestricted use and redistribution provided that the original author and source are credited. |
spellingShingle | Article GÜLER, Melih VARIŞLI, Dilek Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
title | Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
title_full | Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
title_fullStr | Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
title_full_unstemmed | Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
title_short | Multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
title_sort | multiwall carbon nanotube-supported molybdenum catalysts for ammonia decomposition reaction under microwave effect |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7668040/ https://www.ncbi.nlm.nih.gov/pubmed/33488159 http://dx.doi.org/10.3906/kim-1907-4 |
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