Coke resistant NiCo/CeO2 catalysts for dry reforming of methane derived from core@shell Ni@Co nanoparticles

Yang, Euiseob; Nam, Eonu; Jo, Yoonjeong; An, Kwangjin

doi:10.1016/j.apcatb.2023.123152

Cited by 32 publications

(3 citation statements)

References 75 publications

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“…It started with similar activity of the other catalysts, then rapidly deactivated after 5 h of reaction. As is commonly reported in reforming reactions, catalyst deactivation typically stems from two primary factors: carbon formation and sintering on the catalyst [ 36 , 37 , 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol and Dry Reforming of Methane with CO2 on Ni/Vermiculite: Stability Improvement via Acid or Base Treatment of the Support

Mahir,

Benzaouak,

Mesrar

et al. 2024

Molecules

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In this study, vermiculite was explored as a support material for nickel catalysts in two key processes in syngas production: dry reforming of methane with CO2 and steam reforming of ethanol. The vermiculite underwent acid or base treatment, followed by the preparation of Ni catalysts through incipient wetness impregnation. Characterization was conducted using various techniques, including X-ray diffraction (XRD), SEM–EDS, FTIR, and temperature-programmed reduction (H2-TPR). TG-TD analyses were performed to assess the formation of carbon deposits on spent catalysts. The Ni-based catalysts were used in reaction tests without a reduction pre-treatment. Initially, raw vermiculite-supported nickel showed limited catalytic activity in the dry reforming of methane. After acid (Ni/VTA) or base (Ni/VTB) treatment, vermiculite proved to be an effective support for nickel catalysts that displayed outstanding performance, achieving high methane conversion and hydrogen yield. The acidic treatment improved the reduction of nickel species and reduced carbon deposition, outperforming the Ni over alkali treated support. The prepared catalysts were also evaluated in ethanol steam reforming under various conditions including temperature, water/ethanol ratio, and space velocity, with acid-treated catalysts confirming the best performance.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol and Dry Reforming of Methane with CO2 on Ni/Vermiculite: Stability Improvement via Acid or Base Treatment of the Support

Mahir,

Benzaouak,

Mesrar

et al. 2024

Molecules

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show abstract

“…Nevertheless, beyond this point, there is a gradual decline in its performance, which indicates catalyst deactivation. As is commonly reported in reforming reactions, catalyst deactivation typically stems from two primary factors: carbon formation and sintering on the catalyst [32][33][34][35].…”

Section: Ethanol Steam Reformingmentioning

confidence: 99%

Hydrogen Production by Steam Reforming of Ethanol and Dry Reforming of Methane with CO2 on Ni/Vermiculite: Stability Improvement via Acid-Base Treatment of the Support

Mahir,

Benzaouak,

Mesrar

et al. 2024

Preprint

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In this study, vermiculite was explored as a support material for nickel catalysts in two key processes in syngas production through dry reforming of methane with CO2 and steam reforming of ethanol. The vermiculite was subjected to acid or base treatment, then, Ni catalysts were prepared through incipient wetness impregnation and characterized using various techniques, including X-ray, FTIR, temperature programmed reduction (H2-TPR). TG-TD analyses were performed to assess the formation of carbon deposits on spent catalysts. The Ni based catalysts were used in the reaction tests without a reduction pre-treatment. Initially, raw vermiculite-supported nickel showed limited catalytic activity, however after acid (Ni/VTA) or base (Ni/VTB) treatment, vermiculite became an effective support for nickel in dry methane reforming. The resulting catalysts (Ni/VTB and Ni/VTA) displayed outstanding performance, with high methane conversion and hydrogen yield. Acidic treatment improved the reduction of nickel species and reduced carbon deposition, outperforming alkali treatment. The prepared catalysts were also explored in ethanol steam reforming. The performance was investigated as a function of the temperature, water/ethanol ratio, and space velocity, with acid-treated catalysts performing as the best. The study emphasized the importance of contact time with the catalyst and addressed challenges related to carbon formation and sintering for long-term stability. In conclusion, acidic treatment of the vermiculite support, before Ni deposition, significantly enhanced the catalytic activity and stability of nickel catalysts in both dry methane reforming and ethanol steam reforming processes.

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“…, especially as heterogenous catalysts, which in some cases can overwhelm noble metal catalysts. 25–27 Since in alloy-based materials, formed by adding metal atoms with similar electronic configurations to the lattice, the local coordination micro-environment and the electronic structure can be more precisely adjusted to obtain better match patterns, thus enhancing their activities. 28 The metals Ni and Co have comparable atomic radius, and the Ni–Co alloy formed by the overlap of the d-orbital of the metal phase in the Ni–Co composite catalyst has good catalytic activity and stability.…”

Section: Introductionmentioning

confidence: 99%

Ni–Co alloys via controlled pyrolysis of NiCo–MOF as heterogeneous hydrogenation catalysts

Deng,

Liu,

Chen

et al. 2024

New J. Chem.

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Coke resistant NiCo/CeO2 catalysts for dry reforming of methane derived from core@shell Ni@Co nanoparticles

Cited by 32 publications

References 75 publications

Hydrogen Production by Steam Reforming of Ethanol and Dry Reforming of Methane with CO2 on Ni/Vermiculite: Stability Improvement via Acid or Base Treatment of the Support

Hydrogen Production by Steam Reforming of Ethanol and Dry Reforming of Methane with CO2 on Ni/Vermiculite: Stability Improvement via Acid or Base Treatment of the Support

Hydrogen Production by Steam Reforming of Ethanol and Dry Reforming of Methane with CO2 on Ni/Vermiculite: Stability Improvement via Acid-Base Treatment of the Support

Ni–Co alloys via controlled pyrolysis of NiCo–MOF as heterogeneous hydrogenation catalysts

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