Decomposition of ethanol into H2-rich gas and carbon nanotubes over Ni, Co and Fe supported on SBA-15 and Aerosil

Palacio, Rubén; Gallego, Jaime; Gabélica, Z.; Batiot‐Dupeyrat, Catherine; Barrault, J.; Valange, Sabine

doi:10.1016/j.apcata.2015.03.041

Cited by 27 publications

(21 citation statements)

References 49 publications

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“…The weight loss percentages of the catalysts were in the sequence: The TG/DTG curves of the spent catalysts are presented in Figure 10. The Ni/SP-IM catalyst showed two decomposition peaks at around 300-450 • C and 600-850 • C, with the first assigned to the decomposition of amorphous carbon and the second assigned to the decomposition of graphitic carbon [36,37]. In contrast, only one decomposition peak (500-700 • C) was observed on the SF-supported Ni catalysts, which was attributed to the decomposition of graphitic carbon.…”

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confidence: 72%

“…Thus, the catalysts prepared by the DP and SEA methods effectively suppressed sintering, which was attributed to the strong interaction between the active phase and support, which then maintained a good dispersion of the active species in the catalysts during the ESR; the good interaction of Ni with the support also helped the reduction of the carbon deposition effect, thus giving higher performances and maintaining a better stability in the ESR tests. showed two decomposition peaks at around 300-450 °C and 600-850 °C, with the first assigned to the 375 decomposition of amorphous carbon and the second assigned to the decomposition of graphitic 376 carbon [36,37]. In contrast, only one decomposition peak (500-700 °C) was observed on the SF-…”

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confidence: 80%

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Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

et al. 2018

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Ni/SiO 2 (Ni/SF) catalysts were prepared by electrospinning of the SF followed by impregnation. The performance of the Ni/SF catalysts for hydrogen production from ethanol steam reforming at various conditions was investigated in comparison with a conventional Ni/silica porous (Ni/SP) catalyst. The influence of the Ni/SF catalyst preparation methods on the catalytic activity and stability in ethanol steam reforming was also studied. The catalysts were prepared by three different preparation techniques: impregnation (IM), deposition precipitation (DP) and strong electrostatic adsorption (SEA). The Ni/SF catalyst exhibited higher performances and stability than the Ni/SP catalyst. The H 2 yields of 55% and 47% were achieved at 600 • C using the Ni/SF and Ni/SP catalysts, respectively. The preparation methods had a significant effect on the catalytic activity and stability of the Ni/SF catalyst, where that prepared by the SEA method had a smaller Ni particle size and higher dispersion, and also exhibited the highest catalytic activity and stability compared to the Ni/SF catalysts prepared by IM and DP methods. The maximum H 2 yield produced from the catalyst prepared by SEA was 65%, while that from the catalysts prepared by DP and IM were 60% and 55%, respectively, under the same conditions. The activity of the fiber catalysts prepared by SEA, DP and IM remained almost constant at all times during a 16 h stability test.

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confidence: 72%

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confidence: 80%

Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

et al. 2018

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“…At present, methane and ethanol are still the main raw materials for producing hydrogen by catalytic cracking. Palacio et al 53 prepared Ni/SBA‐15, Co/SBA‐15 and Fe/SBA‐15 catalysts, and evaluated their catalytic performance in ethanol cracking into hydrogen and CNTs. They found that the nickel‐based catalyst exhibited the best catalytic performance; the content of hydrogen in the gas produced at the beginning of the reaction was close to 85%.…”

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confidence: 99%

Simultaneous production of hydrogen and carbon nanotubes from cracking of a waste cooking oil model compound over Ni‐Co / SBA ‐15 catalysts

Liu

2020

Int J Energy Res

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Hydrogen is considered an ideal energy carrier. However, the use of fossil fuels to produce hydrogen depletes natural resources and causes environmental problems. Therefore, there is an urgent need to find alternative raw materials and technologies for the production of hydrogen. Waste cooking oil (WCO) is a renewable energy source that has emerged as a potential raw material for hydrogen production. This study describes the production of hydrogen and carbon nanotubes (CNTs) by catalytic cracking of a WCO model compound (WCOMC) performed in a lab-scale fixed bed using Ni-Co/SBA-15 catalysts. The phase, structure and reduction properties of the catalyst were analysed by using different characterisation methods. The effects of the nickel-cobalt metal content and the reaction temperature on both the hydrogen production and the quality of the CNTs were investigated. The deposited carbonaceous products were characterised to analyse their external appearance, internal structure, oxidation stability and graphitisation degree. The results indicated that the catalyst containing 20% Ni and 30% Co showed the highest activity. When reaction temperature was 800 C, the instantaneous volume fraction of hydrogen was close to 43.5 vol% and the content of hydrogen in the gas product was close to 66.5 vol%. A few multi-walled CNTs having a small diameter and some CNTs with an open-topped structure were deposited on 10%Ni-40%Co/SBA-15 and 30%Ni-20%Co/SBA-15, respectively. Thermogravimetric analysis and Raman spectroscopic analysis indicated that all CNTs showed high oxidation stability and a high degree of graphitisation.

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“…In particular, SBA‐15 has a uniform 2D hexagonal ordered mesopore channel structure, large surface area and pore volume, high hydrothermal, and thermal stability. These textural properties not only are beneficial to the active metal more evenly dispersed in the pores of the channel but also can improve the activity of the catalyst (He et al, ; Palacio et al, ).…”

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confidence: 99%

Preparation and characterization of Ni‐Agx/SBA‐15 and its catalytic properties on the hydrogenation of soybean oil

Zou

Zhao

et al. 2018

J Food Process Engineering

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Ni‐Agx/SBA‐15 catalysts with different contents of the silver (Ag) promoter were prepared by the co‐impregnation method using the support of the mesoporous material SBA‐15. The Ni‐Agx/SBA‐15 catalysts were characterized by ICP‐OES, X‐ray diffraction (XRD), transmission electron microscope (TEM), and N2 adsorption–desorption isotherms. The activity of the catalysts on hydrogenation of soybean oil was evaluated. The results indicated that all the catalysts retained the hexagonally ordered structure of SBA‐15, the binding force between SBA‐15 and Ni was enhanced by the addition of the Ag promoter, and Ni was well loaded on the surface and the interior of the support that was beneficial to the improvement of catalyst activity. TEM images of the catalysts show that the addition of the silver can promote the dispersion of nickel particles over and inside the mesoporous channels of the SBA‐15 support, and the aggregation of metal nickel particles was decreased. The catalysts of Ra‐Ni (Raney Nickel), Ni/SBA‐15 and Ni‐Agx/SBA‐15 were used in the hydrogenation of soybean oil. The results show that Ni‐Ag0.15/SBA‐15 in hydrogenation processing has higher catalytic activity, and the obtained hydrogenated soybean oil has low trans fatty acids (TFAs) content. The use efficiency of the catalyst decreased to 60% after 8 cycles. Practical applications The main objective of this work was to hydrogenate soybean oil. Very encouraging results were obtained with Ni‐Ag0.15/SBA15. This preparation had a higher catalyst activity to obtain low trans fatty acid content. This finding is very valuable for fat and oil processing at the industry level.

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Decomposition of ethanol into H2-rich gas and carbon nanotubes over Ni, Co and Fe supported on SBA-15 and Aerosil

Cited by 27 publications

References 49 publications

Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

Investigation of Ni/SiO2 Fiber Catalysts Prepared by Different Methods on Hydrogen production from Ethanol Steam Reforming

Simultaneous production of hydrogen and carbon nanotubes from cracking of a waste cooking oil model compound over Ni‐Co / SBA ‐15 catalysts

Preparation and characterization of Ni‐Agx/SBA‐15 and its catalytic properties on the hydrogenation of soybean oil

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