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Optimization of carbon nanotube-coated monolith by direct liquid injection chemical vapor deposition based on Taguchi method


Omar, Qistina and Ali, Salmiaton and Choong, Thomas Shean Yaw and Yap, Taufiq Yun Hin and Siajam, Shamsul Izhar (2020) Optimization of carbon nanotube-coated monolith by direct liquid injection chemical vapor deposition based on Taguchi method. Catalysts, 10 (1). art. no. 67. pp. 1-17. ISSN 2073-4344


Carbon nanotubes (CNTs) have the potential to act as a catalyst support in many sciences and engineering fields due to their outstanding properties. The CNT-coated monolith was synthesized over a highly active Ni catalyst using direct liquid injection chemical vapor deposition (CVD). The aim was to study the optimum condition for synthesizing CNT-coated monoliths. The Taguchi method with L9 (34) orthogonal array design was employed to optimize the experimental conditions of CNT-coated monoliths. The design response was the percentage of carbon yield expressed by the signal-to-noise (S/N) value. The parameters including the mass ratio of Ni to citric acid (Ni:CA) (A), the injection rate of carbon source (B), time of reaction (C), and operating temperature (D) were selected at three levels. The results showed that the optimum conditions for CNT-coated monolith were established at A1B2C1D2 and the most influential parameter was D followed by B, C, and A. The ANOVA analysis showed the design was significant with R-squared and standard deviation of the factorial model equal to 0.9982 and 0.22, respectively. A confirmation test was conducted to confirm the optimum condition with the actual values of the average percentage of carbon yield deviated 1.4% from the predicted ones. The CNT-coated monoliths were characterized by various techniques such as field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Raman spectroscopy.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Engineering
Faculty of Science
DOI Number: https://doi.org/10.3390/catal10010067
Publisher: MDPI
Keywords: Carbon nanotubes; Carbon vapor deposition; Optimization; Taguchi method
Depositing User: Nabilah Mustapa
Date Deposited: 03 May 2020 23:04
Last Modified: 03 May 2020 23:04
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/catal10010067
URI: http://psasir.upm.edu.my/id/eprint/38184
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