The effects of process parameters on carbon dioxide reforming of methane over Co–Mo–MgO/MWCNTs nanocomposite catalysts

Khavarian, Mehrnoush; Chai, Siang‐Piao; Mohamed, Abdul Rahman

doi:10.1016/j.fuel.2015.05.021

Cited by 37 publications

(13 citation statements)

References 42 publications

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“…Table 6. Comparison of performances from Ru/CNT (model, this study) and Pt_Pd/CNT (model from [21]). T = 773K, P = 3.03 × 10 5 Pa, 0.001 kg catalyst, total feed 5.6 × 10 −5 mole/s, feed CH 4 /CO 2 = 1.…”

Section: Comparison Of Ru/cnt To Pt_pd/cntmentioning

confidence: 99%

“…This was attributed to a redirection of carbon deposits away from the Ni sites to growth along the CNT tips [20]. Dry reforming of CH 4 over Co/CNT and Co/MgO showed higher CH 4 conversions from Co/CNT, which also had lower carbon deposition rates and less catalyst deactivation [21].…”

Section: Introductionmentioning

confidence: 99%

“…It has been claimed that DR occurs through a catalytic decomposition of CH 4 to adsorbed C and H atoms, thus facilitating carbon deposits [28]. Finally, Reactions 2 and 3 are known to occur during CH 4 DR [21].…”

mentioning

confidence: 99%

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Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

et al. 2020

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In this study, CH4 dry reforming was demonstrated on a novel microwave-synthesized ruthenium (Ru)/carbon nanotube (CNT) catalyst. The catalyst was tested in an isothermal laboratory-packed bed reactor, with gas analysis by gas chromatography/thermal conductivity detection. The catalyst demonstrated excellent dry-reforming activity at modest temperatures (773–973 K) and pressure (3.03 × 105 Pa). Higher reaction temperatures favored increased conversion of CH4 and CO2, and increased H2/CO product ratios. Slight coke deposition, estimated by carbon balance, was observed at higher temperatures and higher feed CH4/CO2. A robust global kinetic model composed of three reversible reactions—dry reforming, reverse water gas shift, and CH4 decomposition—simulates observed outlet species concentrations and reactant conversions using this Ru/CNT catalyst over the temperature range of this study. This engineering kinetic model for the Ru/CNT catalyst predicts a somewhat higher selectivity and yield for H2, and less for CO, in comparison to previously published results for a similarly prepared Pt_Pd/CNT catalyst from our group.

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Section: Comparison Of Ru/cnt To Pt_pd/cntmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

et al. 2020

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“…Thermal sintering and metal oxidation would lead to direct deactivation of catalysts. It has been observed that active metals and supports play a crucial role in catalyst performance during DRM [10]. Noble metals, such as Pt, Ru, Rh, and many others, have a superior tendency to suppress coking, i.e., carbon deposition [11,12], but the expensive nature of these metals puts a restriction on their application at the industrial level.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nature Support on Methane and CO2 Conversion in a Dry Reforming Reaction over Nickel-Supported Catalysts

et al. 2019

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A promising method to reduce global warming has been methane reforming with CO2, as it combines two greenhouse gases to obtain useful products. In this study, Ni-supported catalysts were synthesized using the wet impregnation method to obtain 5%Ni/Al2O3(SA-5239), 5%Ni/Al2O3(SA-6175), 5%Ni/SiO2, 5%Ni/MCM41, and 5%Ni/SBA15. The catalysts were tested in dry reforming of methane at 700 °C, 1 atm, and a space velocity of 39,000 mL/gcat h, to study the interaction of Ni with the supports, and evaluation was based on CH4 and CO2 conversions. 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2 gave the highest conversion of CH4 (78 and 75%, respectively) and CO2 (84 and 82%, respectively). The catalysts were characterized by some techniques. Ni phases were identified by X-ray diffraction patterns. Brunauer–Emmett–Teller analysis showed different surface areas of the catalysts with the least being 4 m2/g and the highest 668 m2/g belonging to 5%Ni/Al2O3(SA-5239) and 5%Ni/SBA15, respectively. The reduction profiles revealed weak NiO-supports interaction for 5%Ni/Al2O3(SA-5239), 5%Ni/MCM41, and 5%Ni/SBA15; while strong interaction was observed in 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2. The 5%Ni/Al2O3(SA-6175) and 5%Ni/SiO2 were close with respect to performance; however, the former had a higher amount of carbon deposit, which is mostly graphitic, according to the conducted thermal analysis. Carbon deposits on 5%Ni/SiO2 were mainly atomic in nature.

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“…The syngas (H 2 and CO) commonly used for organic synthesis is mainly obtained by coal gasification and the steam reforming of methane (SRM) [1]. In recent years, the carbon dioxide reforming of methane (DRM) has attracted considerable attention [2,3] for its comprehensive utilization of two main greenhouse gases [4,5].…”

Section: Introductionmentioning

confidence: 99%

Combining Carbon Fibers with Ni/γ–Al2O3 Used for Syngas Production: Part A: Preparation and Evaluation of Complex Carrier Catalysts

et al. 2018

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To promote the adsorption and activation of carbon dioxide in the dry reforming of methane (DRM), Ni and Al2O3 were coprecipitated on activated carbon fibers (ACF). Various characterization methods were adopted in order to investigate the surface characteristics of different catalysts. Chemisorption characterization results, such as H2-temperature programmed reduction (H2-TPR), H2-temperature programmed desorption (H2-TPD), and CO2-temperature programmed desorption (CO2-TPD) illustrated that ACF in a nickel-based catalyst could enhance the basic sites and improve the metal dispersion on a catalyst surface, which is beneficial for the adsorption and activation of feed gas. The coprecipitated coating on ACF proved by scanning electron microscope (SEM) can prevent the carbon of ACF from participating in the reaction, while retain good surface properties of carbon fibers. X-ray diffraction (XRD) patterns illustrated that the ACF in a nickel-based catalyst could decrease the crystallite size of the spinel NiAl2O4, which is beneficial for methane reforming. In addition, the Fourier transform infrared spectroscopy (FTIR) of different catalysts revealed that the added ACF could provide abundant functional groups on the surface, which could be the intermediate product of DRM, and effectively promote the reaction. Different to the catalyst supported on single alumina, the performance evaluation and stability test proved that the catalyst added with ACF exhibited a better catalytic performance especially for CO2 conversion. Moreover, based on the characterization results as well as some related literature, the dry reforming mechanism over optimum catalyst was derived.

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The effects of process parameters on carbon dioxide reforming of methane over Co–Mo–MgO/MWCNTs nanocomposite catalysts

Cited by 37 publications

References 42 publications

Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

Dry Reforming of Methane over a Ruthenium/Carbon Nanotube Catalyst

Influence of Nature Support on Methane and CO2 Conversion in a Dry Reforming Reaction over Nickel-Supported Catalysts

Combining Carbon Fibers with Ni/γ–Al2O3 Used for Syngas Production: Part A: Preparation and Evaluation of Complex Carrier Catalysts

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