Carbon precursor analysis for catalytic growth of carbon nanotube in flame synthesis based on semi-empirical approach

Zainal Muhammad Thalhah; Mohd Yasin Mohd Fairus; Wan Ali Wan Fahmin Faiz; Tamrin Khairul Fikri; Ani Mohd Hanafi

doi:10.1007/s42823-020-00127-z

Carbon precursor analysis for catalytic growth of carbon nanotube in flame synthesis based on semi-empirical approach

Carbon Letters
Abbr : Carbon Lett.
2020, 30(5), pp.569-579
DOI : 10.1007/s42823-020-00127-z
Publisher : Korean Carbon Society
Research Area : Natural Science > Natural Science General > Other Natural Sciences General
Received : November 10, 2019
Accepted : February 17, 2020
Published : October 1, 2020

Zainal Muhammad Thalhah ¹, Mohd Yasin Mohd Fairus ¹, Wan Ali Wan Fahmin Faiz ¹, Tamrin Khairul Fikri ², Ani Mohd Hanafi ³

¹Universiti Teknologi Malaysia
²Universiti Malaysia Sarawak
³International Islamic University Malaysia

Accredited

ABSTRACT

Although fame synthesis promises economic beneft and rapid synthesis of carbon nanotube (CNT), the lack of control and understanding of the efects of fame parameters (e.g., temperature and precursor composition) impose some challenges in modelling and identifying CNT growth region for obtaining better throughput. The present study presents an investigation on the types of carbon precursor that afect CNT growth region on nickel catalyst particles in an ethylene inverse difusion fame. An established CNT growth rate model that describes physical growth of CNT is utilised to predict CNT length and growth region using empirical inputs of fame temperature and species composition from the literature. Two variations of the model are employed to determine the dominant precursor for CNT growth which are the constant adsorption activation energy (CAAE) model and the varying adsorption activation energy (VAAE) model. The carbon precursors investigated include ethylene, acetylene, and carbon monoxide as base precursors and all possible combinations of the base precursors. In the CAAE model, the activation energy for adsorption of carbon precursor species on catalyst surface Ea,1 is held constant whereas in the VAAE model, Ea,1 is varied based on the investigated precursor. The sensitivity of the growth rate model is demonstrated by comparing the shifting of predicted growth regions between the CAAE model and the VAAE model where the CAAE model serves as a control case. Midpoint-based and threshold-based techniques are employed within each model to quantify the predicted CNT growth region. Growth region prediction based on the midpoint-VAAE approach demonstrates the importance of acetylene and carbon monoxide to some extent towards CNT growth. Ultimately, the threshold-VAAE model shows that the dominant precursor for CNT growth is the mixture of acetylene and carbon monoxide. A simplifed reaction mechanism is proposed to describe the surface chemistry for precursor reactions with nickel catalyst where decomposition of the ethylene fuel source into acetylene and carbon monoxide is accounted for by chemisorption.

KEYWORDS

Carbon nanotube (CNT) · Modelling · Catalytic growth · Flame synthesis · Carbon precursor

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Carbon Letters 2023 KCI Impact Factor : 1.35 KCI-WoS Impact Factor : 6.04

Carbon precursor analysis for catalytic growth of carbon nanotube in flame synthesis based on semi-empirical approach

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This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2024-07-28)

Total Citation Counts(KCI+WOS) (2) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (2) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2024-10-01)

* References for papers published after 2023 are currently being built.

Carbon Letters 2023 KCI Impact Factor : 1.35 KCI-WoS Impact Factor : 6.04

Carbon precursor analysis for catalytic growth of carbon nanotube in flame synthesis based on semi-empirical approach

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WoS Citation Counts (2) This is the result of checking the information with the same ISSN, publication year, volume, and start page between the WoS and the KCI journals. (as of 2024-07-28)

Total Citation Counts(KCI+WOS) (2) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (2) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2024-10-01)

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