Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield
Carbon nanotube fiber (CNT fiber) synthesized through floating catalyst chemical vapor deposition (FC-CVD) is one of the strongest man-made fibers ever synthesized. The poor carbon conversion in the FC-CVD process is one of the major hurdles in its commercial deployment. In this work, we have employ...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Carbon Trends |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667056922000670 |
| _version_ | 1811297995207999488 |
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| author | Rajath Alexander Amit Khausal Jitendra Bahadur Kinshuk Dasgupta |
| author_facet | Rajath Alexander Amit Khausal Jitendra Bahadur Kinshuk Dasgupta |
| author_sort | Rajath Alexander |
| collection | DOAJ |
| description | Carbon nanotube fiber (CNT fiber) synthesized through floating catalyst chemical vapor deposition (FC-CVD) is one of the strongest man-made fibers ever synthesized. The poor carbon conversion in the FC-CVD process is one of the major hurdles in its commercial deployment. In this work, we have employed a novel method of bi-directional catalyst injection where catalysts were injected from both inlet and outlet sides of the reactor. The injection of the catalyst from the outlet into the reactor reaction zone was possible by a backflow caused by the convection vortex as predicted by the computational fluid dynamics (CFD) analysis. Bi-directional catalyst injection was able to enhance the carbon conversion by 56% compared to conventional unidirectional injection. CNT fibers obtained in bi-directional catalyst injection are a mixture of multi-walled (MW) and single-walled (SW) CNTs whereas unidirectional catalyst injection resulted in MWCNTs only. The average CNT bundle diameter dimensions were similar in both unidirectional and bi-directional catalyst injection. The amorphous carbon content was lower for bi-directional catalyst injection. A mechanism for the improvement of carbon conversion in bi-direction catalyst injection has been proposed. |
| first_indexed | 2024-04-13T06:12:26Z |
| format | Article |
| id | doaj.art-3380286ea76349e9a0c197bbea206a4c |
| institution | Directory Open Access Journal |
| issn | 2667-0569 |
| language | English |
| last_indexed | 2024-04-13T06:12:26Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Carbon Trends |
| spelling | doaj.art-3380286ea76349e9a0c197bbea206a4c2022-12-22T02:58:57ZengElsevierCarbon Trends2667-05692022-10-019100211Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yieldRajath Alexander0Amit Khausal1Jitendra Bahadur2Kinshuk Dasgupta3Materials Group, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, IndiaMaterials Group, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, IndiaHomi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India; Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, IndiaHomi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India; Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Corresponding author at: Materials Group, Bhabha Atomic Research Centre, Mumbai 400085, India.Carbon nanotube fiber (CNT fiber) synthesized through floating catalyst chemical vapor deposition (FC-CVD) is one of the strongest man-made fibers ever synthesized. The poor carbon conversion in the FC-CVD process is one of the major hurdles in its commercial deployment. In this work, we have employed a novel method of bi-directional catalyst injection where catalysts were injected from both inlet and outlet sides of the reactor. The injection of the catalyst from the outlet into the reactor reaction zone was possible by a backflow caused by the convection vortex as predicted by the computational fluid dynamics (CFD) analysis. Bi-directional catalyst injection was able to enhance the carbon conversion by 56% compared to conventional unidirectional injection. CNT fibers obtained in bi-directional catalyst injection are a mixture of multi-walled (MW) and single-walled (SW) CNTs whereas unidirectional catalyst injection resulted in MWCNTs only. The average CNT bundle diameter dimensions were similar in both unidirectional and bi-directional catalyst injection. The amorphous carbon content was lower for bi-directional catalyst injection. A mechanism for the improvement of carbon conversion in bi-direction catalyst injection has been proposed.http://www.sciencedirect.com/science/article/pii/S2667056922000670CNT fiberFloating catalyst chemical vapor depositionRaman spectroscopyScanning electron microscopy |
| spellingShingle | Rajath Alexander Amit Khausal Jitendra Bahadur Kinshuk Dasgupta Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield Carbon Trends CNT fiber Floating catalyst chemical vapor deposition Raman spectroscopy Scanning electron microscopy |
| title | Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield |
| title_full | Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield |
| title_fullStr | Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield |
| title_full_unstemmed | Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield |
| title_short | Bi-directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield |
| title_sort | bi directional catalyst injection in floating catalyst chemical vapor deposition for enhanced carbon nanotube fiber yield |
| topic | CNT fiber Floating catalyst chemical vapor deposition Raman spectroscopy Scanning electron microscopy |
| url | http://www.sciencedirect.com/science/article/pii/S2667056922000670 |
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