Synthesis of Highly Dispersed Nanosized NiO/MgO-Al<sub>2</sub>O<sub>3</sub> Catalyst for the Production of Synthetic Natural Gas with Enhanced Activity and Resistance to Coke Formation

Ebadi, Ahmad; Tourani, Somayeh; Khorasheh, Farhad

doi:10.1021/acs.iecr.8b01878

Cited by 13 publications

(4 citation statements)

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“…An ideal catalyst for CO methanation has to be highly active at low temperature, stable at high temperature, and able to achieve high methane selectivity. 5 Nickel (Ni) has been acknowledged as the most appropriate catalyst for CO methanation because of its lower cost than noble metals, as well as its high activity and selectivity. 6 However, Ni catalysts suffer from rapid deactivation caused by sintering of Ni particles at high temperature because of the highly exothermic reaction.…”

Section: Introductionmentioning

confidence: 99%

Influences of Calcination Atmosphere on Nickel Catalyst Supported on Mesoporous Graphitic Carbon Nitride Thin Sheets for CO Methanation

Ahmad

Anuar

Isahak

et al. 2020

ACS Appl. Mater. Interfaces

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Nickel (Ni) catalysts supported on mesoporous graphitic carbon nitride (mpg-C3N4) were synthesized through simple impregnation method with air and nitrogen calcination atmosphere for CO methanation. The effects of pretreatment gas on catalyst structure, surface characteristics, and Ni species reducibility were investigated. Under air-calcination condition, the increase in specific surface area of the catalyst can be ascribed to the creation of mesopores and exfoliation of bulk mpg-C3N4 to form thin sheets. However, excessive Ni content on the catalyst accelerated the decomposition of the mpg-C3N4 support during calcination. The catalysts calcined in nitrogen showed lower surface area and fewer number of pores compared to air-treatment. The Ni/mpg-C3N4 catalyst calcined in air with Ni loading 10% exhibited enhanced medium-temperature activity for CO methanation with 79.7% CO conversion and 73.9% CH4 selectivity. This finding can be explained by the formation of mpg-C3N4 thin sheets, which increased the number of catalyst active sites. The CO methanation performance of Ni/mpg-C3N4 catalysts calcined in air was superior to those calcined in nitrogen. Interestingly, CO2 formed by water–gas shift reaction at 320 °C also contributed to the overall methane formation through CO2 methanation. Therefore, mpg-C3N4 thin sheets can be an interesting support for nickel catalyst for CO x methanation.

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Section: Introductionmentioning

confidence: 99%

Influences of Calcination Atmosphere on Nickel Catalyst Supported on Mesoporous Graphitic Carbon Nitride Thin Sheets for CO Methanation

Ahmad

Anuar

Isahak

et al. 2020

ACS Appl. Mater. Interfaces

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“…The second weight loss occurred between 150°C-200°C might be the result of the release of DMF from the pore of adsorbents [34]. The peak in the 380 and 450°C is related to the separation of structural water and various organic compounds from the framework structure [44]. The big weight loss that took place between 352 and 555°C was attributed to the destruction of the framework structure [6,45].…”

Section: ( ) ( )mentioning

confidence: 99%

Synthesis of MIL-101(Cr)/Sulfasalazine (Cr-TA@SSZ) hybrid and its use as a novel adsorbent for adsorptive removal of organic pollutants from wastewaters

Tourani

Behvandi

2022

Preprint

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Metal-organic frameworks (MOFs) are considered strong adsorbents to the removal of organic pollutants due to their unique characteristics. In this work, a new type of metal-organic porous material MIL-101(Cr)/Sulfasalazine (Cr-TA@SSZ) hybrid successfully synthesized by a hydrothermal approach for the first time. The synthesized Cr-TA@SSZ and MIL-101(Cr) adsorbents were applied for adsorption of terephthalic acid (TA), para-toluic acid (p-tol), and benzoic acid (BA). The Cr-TA@SSZ and MIL-101(Cr) were characterized by the general tests including X-ray diffraction (XRD), Fourier transform infrared (FTIR), Brunauer-Emmett-Teller (BET), transmission electron microscopy (TEM), Scanning electron microscope(SEM), thermal gravimetric analysis (TGA), differential thermal analysis (DTA), zeta potential, and Elemental analysis (EDX). Based on the above analyses, it was concluded that Cr-TA@SSZ has a different composition and network structure to the MIL-101(Cr). The formula for new MOF (Cr-TA@SSZ) proposed as: Cr3F (H2O)2O[C6H4(CO2)2][C6H3N(OH)(CO2)], 2.5H2. The experiments for evaluating the effect of the different parameters such as pH, initial concentration, contact time, and temperature on the removal of the terephthalic acid (TA), para-toluic acid (p-tol), and benzoic acid (BA) were carried out in batch mode. The isotherm, kinetic and thermodynamic models were also analyzed for the adsorption of TA, p-tol, and BA. Equilibrium adsorption was evaluated employing Langmuir, Freundlich, Temkin, and Redlich–Peterson equations, in which Langmuir and Redlich–Peterson models were in good agreement with the experimental results. Maximum adsorption capacity (q0) of the Cr-TA@SSZ for terephthalic acid (TA), para-toluic acid (p-tol), and benzoic acid (BA) were obtained 2208.4 mg.g− 1, 1241.2 mg.g− 1, and 1009.5 mg.g− 1, respectively while for MIL-101(Cr) were obtained 1692.0 mg.g− 1, 952.4 mg.g− 1, and 769.2 mg.g− 1 respectively. The Cr-TA@SSZ was found to be more efficient in the removal of terephthalic acid (TA), para-toluic acid (p-tol), and benzoic acid (BA) from water than the MIL-101(Cr). Also, the results showed that a pseudo-second-order kinetic model with a higher correlation coefficient (R2 > 0.99) matched well for the adsorption of terephthalic acid (TA), para-toluic acid (p-tol), and benzoic acid (BA) onto MIL-101(Cr) and Cr-TA@SSZ. The thermodynamic parameters such as a change in Gibbs free energy (ΔG), enthalpy (∆H), and entropy (ΔS) were determined and the negative values of ΔG indicated that the process of removal was spontaneous at all values of temperatures. Further, the values of ∆H indicated the exothermic nature of the removal process. Moreover, adsorption experiments using industrial wastewater from a TA production plant showed that Cr-TA@SSZ‌ can be used as a promising adsorbent in the adsorptive removal of organic pollutants from wastewaters. This MOF was able to remove 40% COD from the concentrated phase (equivalent to 13000 ppm) and remove 77.3% COD from the diluted phase (equivalent to 4250 ppm) wastewater.

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“…Natural gas is recognized as environment amity with high energy density and conversion efficiency. Therefore, in areas with abundant coal resources such as China, substitute natural gas with coal-based syngas is becoming a workaround for the reasonable, clean, and effective utilization of coal. − …”

Section: Introductionmentioning

confidence: 99%

Influence of the Microstructure of Ni–Co Bimetallic Catalyst on CO Methanation

Liu

Zhao

et al. 2020

Ind. Eng. Chem. Res.

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Bimetallic catalysts have been widely used for CO methanation because of their superior activity and stability. Herein, Ni−Co bimetallic catalysts supported on SiO 2 , xNi−yCo/SiO 2 (x and y refer to the loading of Ni and Co), are fabricated for CO methanation. For 6Ni−9Co/SiO 2 , CO conversion is higher than other catalysts with only Ni and Co or both Ni and Co of different ratios. The stability of the 6Ni−9Co/ SiO 2 is much better in comparison with the 15Ni/SiO 2 and 15Co/SiO 2 . The diffuse reflectance infrared Fourier transform spectroscopy study shows that for both 6Ni− 9Co/SiO 2 and 15Ni/SiO 2 , CHO is generated first. However, the bimetallic Ni−Co catalyst follows a distinctive reaction pathway subsequently: the C−O bond of CHO breaks first and then CH hydrogenates to form CH 4 . However, for 15Ni/SiO 2 , the CHO intermediate first reacts with *H to form CHOH, then C−O breaks, and CH 4 is formed. This work well reveals the relationship between the performance of bimetallic catalysts and their reaction mechanism for CO methanation and sheds light on the further development of other bimetallic catalysts for various applications in catalysis.

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Synthesis of Highly Dispersed Nanosized NiO/MgO-Al₂O₃ Catalyst for the Production of Synthetic Natural Gas with Enhanced Activity and Resistance to Coke Formation

Cited by 13 publications

References 75 publications

Influences of Calcination Atmosphere on Nickel Catalyst Supported on Mesoporous Graphitic Carbon Nitride Thin Sheets for CO Methanation

Influences of Calcination Atmosphere on Nickel Catalyst Supported on Mesoporous Graphitic Carbon Nitride Thin Sheets for CO Methanation

Synthesis of MIL-101(Cr)/Sulfasalazine (Cr-TA@SSZ) hybrid and its use as a novel adsorbent for adsorptive removal of organic pollutants from wastewaters

Influence of the Microstructure of Ni–Co Bimetallic Catalyst on CO Methanation

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Synthesis of Highly Dispersed Nanosized NiO/MgO-Al2O3 Catalyst for the Production of Synthetic Natural Gas with Enhanced Activity and Resistance to Coke Formation

Cited by 13 publications

References 75 publications

Influences of Calcination Atmosphere on Nickel Catalyst Supported on Mesoporous Graphitic Carbon Nitride Thin Sheets for CO Methanation

Influences of Calcination Atmosphere on Nickel Catalyst Supported on Mesoporous Graphitic Carbon Nitride Thin Sheets for CO Methanation

Synthesis of MIL-101(Cr)/Sulfasalazine (Cr-TA@SSZ) hybrid and its use as a novel adsorbent for adsorptive removal of organic pollutants from wastewaters

Influence of the Microstructure of Ni–Co Bimetallic Catalyst on CO Methanation

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Synthesis of Highly Dispersed Nanosized NiO/MgO-Al₂O₃ Catalyst for the Production of Synthetic Natural Gas with Enhanced Activity and Resistance to Coke Formation