Methane decomposition for carbon nanotube production: Optimization of the reaction parameters using response surface methodology

Allaedini, Ghazaleh; Aminayi, Payam; Tasirin, Siti Masrinda

doi:10.1016/j.cherd.2016.06.010

Cited by 40 publications

(11 citation statements)

References 61 publications

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“…The obtained gaseous products were analyzed using a Shimadzu gas chromatograph (GC-2014) equipped with a TCD for H 2 , CO, and CO 2 , while CH 4 analysis was done using a Unibead-C packed column. The percentage of methane conversion and hydrogen yield can be defined as follows 43 …”

Section: Methodsmentioning

confidence: 99%

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO₂ Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Panchan¹,

Donphai²,

Junsomboon³

et al. 2019

ACS Omega

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Deactivation of catalysts due to rapid blocking of active surfaces and pores is a major problem for methane cracking. The removal of the template using different calcination methods contributes to the different characteristics of catalyst support. Therefore, silica supports were prepared with the sol–gel method, where sodium silicate and chitosan are a silica source and a template, respectively. Calcination using a microwave muffle furnace (MWF) was preferred over the conventional electric muffle furnace at the heating rates of 2 and 17 °C/min (CEF2 and CEF17, respectively) in order to remove the chitosan template. A nickel nitrate precursor was loaded onto the obtained silica supports by the incipient wetness impregnation method. The properties of the silica support and the Ni/SiO2 catalysts were characterized by means of N2-sorption, X-ray diffraction, scanning electron microscopy–energy-dispersive X-ray, field emission transmission electron microscopy, and H2 temperature-programmed reduction. The catalytic activity was evaluated using a fixed-bed reactor at 550 °C with a CH4/N2 ratio of 1:4 in the feed. The amount and the allotropes of carbon deposited on the spent catalysts were investigated using thermogravimetric/differential thermal analysis. The results showed that the SiO2-MWF support had a higher surface area and a larger pore volume of a mesoporous structure with larger interparticle channels than that of the SiO2-CEF supports. This leads to the higher dispersion of Ni metal particles over and inside the interparticle channels of the SiO2-MWF support. This provided a higher metal–support interaction, resulting in lower rates of methane conversion and carbon deposition on the catalyst surface than those of Ni/SiO2-CEF catalysts. However, it displayed a lower bed pressure. It was found that the carbon fibers deposited on all the catalysts were multiwalled carbon nanotubes (MWCNTs). Additionally, the base-growth mechanism of MWCNTs was only exhibited by the Ni/SiO2-MWF catalyst.

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Section: Methodsmentioning

confidence: 99%

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO₂ Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Panchan¹,

Donphai²,

Junsomboon³

et al. 2019

ACS Omega

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“…Figure 4a illustrates these reduction peaks located at 372 °C and 574 °C. The first peak at 372 °C could be possibly attributable to the metal-support interaction reduction of MoO3 [38,39]. The second peak that was around 574 °C was ascribed to the reduction of the MoO2 [40].…”

Section: Physical Characterizationmentioning

confidence: 95%

“…However, Mo/CNT catalyst had a broad NH3 desorption peak at 50-250 °C, showing the presence of weak acid regions in the catalyst [43]. [38,39]. The second peak that was around 574 • C was ascribed to the reduction of the MoO 2 [40].…”

Section: Physical Characterizationmentioning

confidence: 99%

Novel CNT Supported Molybdenum Catalyst for Detection of L-Cysteine in Its Natural Environment

2021

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In this study, novel carbon nanotube-supported Mo (Mo/CNT) catalysts were prepared with the sodium borohydride reduction method for the detection of L-cysteine (L-Cys, L-C). Mo/CNT catalysts were characterized with scanning electron microscopy with elemental dispersion X-ray (EDX-SEM), X-ray diffraction (XRD), UV-vis diffuse reflectance spectrometry (UV-vis), temperature-programmed reduction (TPR), temperature programmed oxidation (TPO), and temperature-programmed desorption (TPD) techniques. The results of these advanced surface characterization techniques revealed that the catalysts were prepared successfully. Electrochemical measurements were employed to construct a voltammetric L-C sensor based on Mo/CNT catalyst by voltammetric techniques such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Further measurements were carried out with electrochemical impedance spectroscopy (EIS). Mo/CNT/GCE exhibited excellent performance for L-C detection with a linear response in the range of 0–150 µM, with a current sensitivity of 200 mA/μM cm2 (0.0142 μA/μM), the lowest detection limit of 0.25 μM, and signal-to-noise ratio (S/N = 3). Interference studies showed that the Mo/CNT/GCE electrode was not affected by D-glucose, uric acid, L-tyrosine, and L-trytophane, commonly interfering organic structures. Natural sample analysis was also accomplished with acetyl L-C. Mo/CNT catalyst is a promising material as a sensor for L-C detection.

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“…Pure CNTs were prepared using the technique described in our previous study [10]. Titanium dioxide (99.9%) was purchased from Sigma Aldrich.…”

Section: Methodsmentioning

confidence: 99%

Untitled

Allaedini

Tasirin

2019

Asian J. Nanosci. Mater.

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Methane decomposition for carbon nanotube production: Optimization of the reaction parameters using response surface methodology

Cited by 40 publications

References 61 publications

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO₂ Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO₂ Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Novel CNT Supported Molybdenum Catalyst for Detection of L-Cysteine in Its Natural Environment

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Methane decomposition for carbon nanotube production: Optimization of the reaction parameters using response surface methodology

Cited by 40 publications

References 61 publications

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO2 Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO2 Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Novel CNT Supported Molybdenum Catalyst for Detection of L-Cysteine in Its Natural Environment

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Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO₂ Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction

Influence of the Calcination Technique of Silica on the Properties and Performance of Ni/SiO₂ Catalysts for Synthesis of Hydrogen via Methane Cracking Reaction