Synthesis of CNTs via chemical vapor deposition of carbon dioxide as a carbon source in the presence of NiMgO

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

doi:10.1016/j.jallcom.2015.06.012

Cited by 47 publications

(23 citation statements)

References 31 publications

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“…25 The peak at near 630°C-830°C implied the reaction between Ni and carbon via the CO disproportionation (3Ni(s) + 2CO(g) →Ni 3 C(s) + CO 2 (g), ΔH = −126 kJ/mol. 26 These showed the formation process of CNT was the surface of Ni catalyst activated from NiO to Ni by reduction reaction at 350°C-400°C and carbon was supplied on the catalyst by the disproportionation reaction at 550°C-900°C after the catalyst was activated. Figure 2B displayed TG-DSC curves of carbon deposited on Ni/MgO in air atmosphere.…”

Section: Resultsmentioning

confidence: 98%

Multi‐wall carbon nanotubes by catalytic decomposition of carbon monoxide on Ni/MgO

Lee

Kim

Cho

et al. 2020

Int J Applied Ceramic Tech

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The redox behavior of the catalyst and the catalytic decomposition of carbon monoxide (CO) were investigated in the synthesis process of multi‐wall carbon nanotubes (MWCNT) using Ni/MgO catalyst. The surface morphology of the heated Ni layer was observed by TEM to confirm the formation of NiO particles (50 nm or less) and NiO (222). The chemical reaction behavior of the catalyst in CO the atmosphere was displayed via TG‐DSC analysis, and the reduction of NiO was revealed due to the mass decrease of 2.71 wt% and the exothermic peak at around 400°C. The deposition of carbon was identified with an increase in mass and the exothermic peak near 600°C. Ni (111) and carbon (002) facets was taken place in a diffraction pattern of carbon deposited catalyst, indicating the reduction in NiO and the graphitic carbon deposition. The crystallinity of the graphitic carbon was analyzed as the ratios of 0.998 for ID/IG and 0.26 for sp3/sp2 in Raman and photoelectron spectra. The encapsulated Ni in MWCNT was observed through TEM‐EDS, verifying the activation of the catalyst by CO.

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Section: Resultsmentioning

confidence: 98%

Multi‐wall carbon nanotubes by catalytic decomposition of carbon monoxide on Ni/MgO

Lee

Kim

Cho

et al. 2020

Int J Applied Ceramic Tech

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“…MWCNTs were synthesized according to the literatures with some modification [21]. In present paper, MWCNTs were prepared by CVD method.…”

Section: Synthesis Of Mwcntsmentioning

confidence: 99%

Photodecontamination of Vat Green 1 and Dianix Blue dyes by MWCNTs/x%TiO2 nanocomposites synthesized using evaporation method

El-Sayed

Mohamed

Galal

et al. 2019

Al-Azhar Bulletin of Science

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Multi-walled carbon nanotubes (MWCNTs) were prepared using chemical vapour deposition (CVD) method. MWCNTs/titanium dioxide nanocomposites (MWCNTs/x%TiO 2 ) with different weight ratios of TiO 2 (x = 3, 6 and 10%) were synthesized using a simple modified evaporation method and used as a photocatalysts. Their photocatalytic activity investigated by studying the decontamination of two local textile dyes (Vat Green 1 and Dianix Blue Dyes) as an industrial organic pollutants commonly used in dyeing factories. The structure of the synthesized photocatalysts were characterized using XRD, SEM, diffused reflectance UV-Vis spectroscopic and N 2 adsorption-desorption method. Also, their optical band gaps were estimated, by as 3.51, 2.89, 2.80, 2.69 eV for MWCNTs and MWCNTs/x%TiO 2 respectively. The mineralization of Vat Green 1 and Dianix Blue dyes in presence of MWCNTs and MWCNTs/x%TiO 2 nanocomposites were investigated by determining the decrease in chemical oxygen demand (COD). In addition, the suggested possible mechanism of the photodegradation processes was studied.

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“…In particular, synthesis of MWCNTs over a catalyst system with MgO support has often been discussed. MWCNTs over Ni/MgO and Co/MgO catalysts have been obtained using CO as a carbon source [20][21][22][23]. It was found that the use of Ni/MgO catalyst results in formation of MWCNTs with the average diameter of 9 nm [23].…”

Section: Introductionmentioning

confidence: 99%

“…MWCNTs over Ni/MgO and Co/MgO catalysts have been obtained using CO as a carbon source [20][21][22][23]. It was found that the use of Ni/MgO catalyst results in formation of MWCNTs with the average diameter of 9 nm [23]. MWCNTs with lager diameters (from 10 nm to 50 nm) that strongly depend on Co nanoparticles size were formed at the Co/MgO catalyst [20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of multi-walled carbon nanotubes with controlled inner and outer diameters by ethylene decomposition over Ni/MgO and Co/MgO catalysts

Lemesh

Strizhak

2018

Materials Science-Poland

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In this work, multi-walled carbon nanotubes (MWCNTs) with significantly different mean diameters were produced by catalytic CVD over Ni and Co-based supported catalysts. Our results indicate that Ni nanoparticles in the Ni/MgO catalyst are responsible for controlling the inner diameters of the carbon nanotubes. Contrary, Co nanoparticles in the Co/MgO catalyst control the outer diameters of MWCNTs. The “base-growth” mechanism and smaller diameters of the MWCNTs grown on the Ni/MgO catalyst are associated with a strong metal-support interaction (SMSI) resulting from NixMg1−xO mixed oxide formation. The concept of the weak metal-support interaction (WMSI) between Co nanoparticles and MgO for the Co/MgO catalyst confirms the “tip-growth” mechanism of the MWCNTs.

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Synthesis of CNTs via chemical vapor deposition of carbon dioxide as a carbon source in the presence of NiMgO

Cited by 47 publications

References 31 publications

Multi‐wall carbon nanotubes by catalytic decomposition of carbon monoxide on Ni/MgO

Multi‐wall carbon nanotubes by catalytic decomposition of carbon monoxide on Ni/MgO

Photodecontamination of Vat Green 1 and Dianix Blue dyes by MWCNTs/x%TiO2 nanocomposites synthesized using evaporation method

Synthesis of multi-walled carbon nanotubes with controlled inner and outer diameters by ethylene decomposition over Ni/MgO and Co/MgO catalysts

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