Optimization of Carbon Nanotube-Coated Monolith by Direct Liquid Injection Chemical Vapor Deposition Based on Taguchi Method
Optimization of Carbon Nanotube-Coated Monolith by Direct Liquid Injection Chemical Vapor Deposition Based on Taguchi Method
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DOI：
10.3390/catal10010067
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发表时间：
2020-01-01
期刊：
影响因子：
3.9
通讯作者：
Izhar, Shamsul
中科院分区：
文献类型：
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作者：
Qistina, Omar;Salmiaton, Ali;Izhar, Shamsul
碳纳米管（CNT）由于其优异的性能，有可能在许多科学和工程领域充当催化剂载体。碳纳米管涂覆的整体材料是在高活性镍催化剂上使用直接液体注射化学气相沉积 (CVD) 合成的。目的是研究合成碳纳米管涂层整体的最佳条件。采用 L-9 (3(4)) 正交阵列设计的田口方法优化了 CNT 涂覆整体材料的实验条件。设计响应是用信噪比 (S/N) 值表示的碳产量百分比。参数包括Ni与柠檬酸的质量比(Ni:CA)(A)、碳源的注入速率(B)、反应时间(C)和操作温度(D)在三个水平上选择。结果表明，CNT涂覆整体材料的最佳条件确定为A(1)B(2)C(1)D(2)，影响最大的参数是D，其次是B、C和A。方差分析表明设计显着，因子模型的R平方和标准差分别等于0.9982和0.22。通过验证试验确定了最佳条件，实际平均碳收率百分比与预测值偏差1.4%。通过场发射扫描电子显微镜 (FESEM)、能量色散 X 射线光谱 (EDX)、X 射线衍射 (XRD) 和拉曼光谱等多种技术对 CNT 涂覆的整体材料进行了表征。
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 L-9 (3(4)) 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 A(1)B(2)C(1)D(2) 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.