Highly stable M/NiO–MgO (M = Co, Cu and Fe) catalysts towards CO2 methanation

Varun, Yaddanapudi; Sreedhar, I.; Singh, Satyapaul A.

doi:10.1016/j.ijhydene.2020.07.212

Cited by 42 publications

(6 citation statements)

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“…In all of the works discussed until now, whenever Cu is added in Ni-based catalysts, the CO 2 methanation reaction is hindered and the antagonistic reverse water-gas shift (RWGS) reaction is instead promoted. Thus, the Cu-containing bimetallic catalysts turned out to be inferior to monometallic Ni ones for CO 2 methanation [38,45,64,88]. Dias et al [90] also showed that even 1% Cu addition on 10% Ni/SiO 2 could drastically decrease CO 2 conversion and increase the selectivity for CO.…”

Section: Promotion With Cumentioning

confidence: 99%

“…The electronic effect of the reducible TiO 2 layer acted to promote metal dispersion and the adsorption of H 2 and CO 2 , while the addition of Co second metal enhanced the intrinsic activity and long-term stability of the NiCo/TiO 2 @SiO 2 catalyst in a fluidized bed reactor. Varun et al [ 88 ] prepared NiO-MgO nanocomposites, via a sonochemical method, that were active for the CO 2 methanation reaction. The authors further modified the composites by impregnating 2% Co, Fe and Cu.…”

Section: Promotion With Transition Metalsmentioning

confidence: 99%

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Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

et al. 2020

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CO2 methanation has recently emerged as a process that targets the reduction in anthropogenic CO2 emissions, via the conversion of CO2 captured from point and mobile sources, as well as H2 produced from renewables into CH4. Ni, among the early transition metals, as well as Ru and Rh, among the noble metals, have been known to be among the most active methanation catalysts, with Ni being favoured due to its low cost and high natural abundance. However, insufficient low-temperature activity, low dispersion and reducibility, as well as nanoparticle sintering are some of the main drawbacks when using Ni-based catalysts. Such problems can be partly overcome via the introduction of a second transition metal (e.g., Fe, Co) or a noble metal (e.g., Ru, Rh, Pt, Pd and Re) in Ni-based catalysts. Through Ni-M alloy formation, or the intricate synergy between two adjacent metallic phases, new high-performing and low-cost methanation catalysts can be obtained. This review summarizes and critically discusses recent progress made in the field of bimetallic Ni-M (M = Fe, Co, Cu, Ru, Rh, Pt, Pd, Re)-based catalyst development for the CO2 methanation reaction.

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Section: Promotion With Cumentioning

confidence: 99%

Section: Promotion With Transition Metalsmentioning

confidence: 99%

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

et al. 2020

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“…The higher activity obtained by Varun et al. could be related to a high H 2 /CO 2 ratio used, which favored the CO 2 conversion 21 …”

Section: Resultsmentioning

confidence: 88%

“…Supported catalysts are the most widely used in CO 2 methanation, such as Al 2 O 3 , SiO 2 , CeO 2 and other metal oxides, as well as zeolites, hydrotalcites, and metal‐organic frameworks (MOFs) 9,19–23 . Transition metals from the groups 8–10 of the periodic table have high activity to CO 2 methanation.…”

Section: Introductionmentioning

confidence: 99%

“…Noble metals such as Rh, Ru, and Pd or other metals such as Ni, Co, and Fe were reported to be active and selective for CH 4 in methanation, with the noble metals presenting better results even when in low contents, though its high cost is commonly impeditive. Therefore, the nonnoble metals are usually chosen as these present good performances and lower costs, with Ni being the most used 21,24 . However, these metals suffer severe deactivation, by sintering, carbon deposition, or even poisoning, being necessary to improve the catalysts resistance, while maintaining its activity, through promotion with other metals, enhancing metal‐support interaction, among others 14,25 …”

Section: Introductionmentioning

confidence: 99%

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Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

Dias

Perez‐Lopez

2021

Greenhouse Gases

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In the present work two series of Ni‐Cu/SiO2 catalysts were evaluated in CO2 methanation. Samples with fixed Ni/Cu ratio and variable total metal loadings, and samples with fixed Ni loadings and variable Ni/Cu ratio were prepared by wet impregnation and characterized by N2 physisorption, X‐ray diffractometry, H2 temperature programmed reduction , scanning electron microscopy with energy dispersive spectroscopy , and temperature programmed oxidation. The catalytic tests were carried out from 250 to 450 °C, H2/CO2 = 4 and 1 atm in a fixed bed tubular reactor with online analysis by gas chromatography. Higher Ni loadings lead to higher Ni° crystallite sizes for samples with fixed Ni/Cu ratio, whereas no difference was observed for samples with variable Ni/Cu ratio. In addition, higher Ni/Cu ratios shifted the reduction temperature to higher values, revealing an increase in metal‐support interaction. Catalysts with Ni/Cu = 10 ratio presented almost equal CO2 conversion regardless of the Ni content, which is attributed to the increase in the Ni° crystallite size as the Ni content increases, whereas the selectivity for CH4 increased with the Ni content due to Ni migration to the surface. For catalysts with fixed Ni content, the higher the Ni/Cu ratio, the greater the CO2 conversion and the CH4 selectivity, demonstrating that the proper adjustment of the Ni/Cu ratio is essential for a high CH4 yield. The catalyst with the highest Ni/Cu ratio achieved a CO2 conversion of 63.3% and CH4 selectivity of 95.7% at 400 °C, showing the greatest resistance to sintering during 5 hr and low carbon formation, which can be attributed to the small crystallite size (∼15 nm) and high metal‐support interaction, resulting from an appropriate Ni/Cu ratio. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Enhanced CO₂ Methanation over Nickel‐Based Unsupported Catalyst Synthesized by Chemical Precipitation Method

Kumar Choudhary,

Yadav,

Kumar Gupta

2024

ChemistrySelect

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This study investigated the catalytic CO2 methanation using nickel oxide (NiO) nanoparticles and nickel oxalate (NiC2O4) as catalysts. The NiC2O4 precursor was synthesized through a chemical precipitation reaction between nickel (II) nitrate hexahydrate (Ni(NO3)2.6H2O) and oxalic acid (H2C2O4.2H2O). Nickel oxide (NiO) nanoparticles were synthesized through thermal decomposition of NiC2O4 precursor at 450 °C in air. The samples were characterized by XRD, FTIR, BET, SEM, and EDX. The XRD and FTIR analyses revealed that the NiO nanoparticles were well‐crystallized having size 17.30 nm. The BET analysis of the NiO sample revealed mesoporous NiO nanoparticles with a specific surface area (SBET) of 29.08 m2/g and a narrow distribution of pore sizes. The catalytic performance of NiO and NiC2O4 catalysts studied for the CO2 methanation in tubular packed bed reactor at 150–550 °C and 1 atm. The reduced NiO nanoparticles exhibited more catalytic activity than the decomposed NiC2O4 catalyst. At 380 °C, 1 atm, and gas hourly space velocity (GHSV) of 9000 mL g−1 h−1, the reduced NiO nanoparticle catalyst showed high catalytic activity, with a maximum CO2 conversion of 85.54 %, 99 % CH4 selectivity, and 84.69 % CH4 yield. Furthermore, the NiO nanoparticle catalyst demonstrated excellent stability after 12 h of streaming at 380 °C.

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Highly stable M/NiO–MgO (M = Co, Cu and Fe) catalysts towards CO2 methanation

Cited by 42 publications

References 74 publications

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

Enhanced CO₂ Methanation over Nickel‐Based Unsupported Catalyst Synthesized by Chemical Precipitation Method

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Highly stable M/NiO–MgO (M = Co, Cu and Fe) catalysts towards CO2 methanation

Cited by 42 publications

References 74 publications

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Bimetallic Ni-Based Catalysts for CO2 Methanation: A Review

Effect of Ni/Cu ratio on activity and selectivity of CO2 methanation over Ni‐Cu/SiO2 catalysts

Enhanced CO2 Methanation over Nickel‐Based Unsupported Catalyst Synthesized by Chemical Precipitation Method

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Effect of Ni/Cu ratio on activity and selectivity of CO₂ methanation over Ni‐Cu/SiO₂ catalysts

Enhanced CO₂ Methanation over Nickel‐Based Unsupported Catalyst Synthesized by Chemical Precipitation Method