Effect of surface properties controlled by Ce addition on CO2 methanation over Ni/Ce/Al2O3 catalyst

Kim, Min Jae; Youn, Jae Rang; Kim, Hye Jeong; Seo, Myung Won; Lee, Doyeon; Go, Kang Seok; Lee, Ki Bong; Jeon, Sang Goo

doi:10.1016/j.ijhydene.2020.06.144

Cited by 76 publications

(30 citation statements)

References 35 publications

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“…As commented above, the introduction of Ce in the catalysts clearly leads to smaller particle sizes and narrower size distributions, which results in a better dispersion of the particles over the support. This fact is linked to the well-known capacity of Ce to prevent particle sintering 14 and the higher Ni content of the Ni−Mg/CDC catalyst, as mentioned previously. These images indicate an excellent interaction, in both fresh and used samples, among Ni, Ce, and Mg, which is probably responsible for the high activity of this catalyst.…”

Section: Methodsmentioning

confidence: 59%

“…The Ni−Mg/CDC sample shows the biggest Ni particle size, with an average value of 21 nm, whereas replacing Mg with Ce results in the Ni particle size drop until 10 nm. This drop is attributed, on the one hand, to the presence of ceria with vacancies of oxygen, which can interact with metallic Ni nanoparticles preventing its sintering 13,14 Nevertheless, some of the observed differences are not that significant when the size values obtained from TEM are also considered (Table 2). The larger particle size in the Ni−Mg/ CDC sample is undeniable; however, the average particle size differences observed in Ce-containing samples are negligible if both estimation methods are considered.…”

Section: Methodsmentioning

confidence: 99%

“…13 In addition to this, the oxygen vacancies may act as adsorption sites for CO 2 molecules. 14,15 On the other hand, CO 2 adsorption and activation are enhanced by the presence of basic sites, thus improving its conversion to CH 4 ; 14,16 this effect was observed over MgO. 5 Other novel materials, such as structured catalysts, 17,18 zeolite, 19 or carbon supports, 20−22 have also been studied.…”

Section: ■ Introductionmentioning

confidence: 99%

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Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO₂ Methanation

et al. 2021

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The CO 2 methanation performance of Mg- and/or Ce-promoted Ni catalysts supported on cellulose-derived carbon (CDC) was investigated. The samples, prepared by biomorphic mineralization techniques, exhibit pore distributions correlated to the particle sizes, revealing a direct effect of the metal content in the textural properties of the samples. The catalytic performance, evaluated as CO 2 conversion and CH 4 selectivity, reveals that Ce is a better promoter than Mg, reaching higher conversion values in all of the studied temperature range (150–500 °C). In the interval of 350–400 °C, Ni–Mg–Ce/CDC attains the maximum yield to methane, 80%, reaching near 100% CH 4 selectivity. Ce-promoted catalysts were highly active at low temperatures (175 °C), achieving 54% CO 2 conversion with near 100% CH 4 selectivity. Furthermore, the large potential stability of the Ni–Mg–Ce/CDC catalyst during consecutive cycles of reaction opens a promising route for the optimization of the Sabatier process using this type of catalyst.

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Section: Methodsmentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO₂ Methanation

et al. 2021

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“…2 -TPD analysis of Sm 2 O 3 showed the CO 2 desorption peaks centered at 172 C and 363 C that were associated with the medium interaction between CO 2 molecules and moderate basic sites. The peaks formed in the medium basic site region also indicated the formation of carbonate species on the catalysts surface 28,29. These carbonate species, specically monodentate carbonate were susceptible towards hydrogenation to form CH 4 .…”

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confidence: 95%

Barium promoted Ni/Sm₂O₃ catalysts for enhanced CO₂ methanation

2021

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“…As we know, the promoter modification is an effective strategy to enhance low-temperature catalytic activity . CeO 2 is a widely used electronic promoter, which can effectively adjust the electronic environment of active metals and enhance the interaction between the metal and support. , In addition, abundant oxygen vacancies on CeO 2 can improve anticoking properties due to the enhancement of the exchange and migration of oxygen species . CeO 2 was used in this work as a promoter to further enhance the catalytic activity of Ni-phyllosilicate catalysts.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Ni-Phyllosilicate Catalyst with Surface and Interface Confinement for CO₂ and CO Methanation

Yang

Liu

2021

Ind. Eng. Chem. Res.

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For the conventional Ni/SiO 2 catalyst, it is a challenge to address the sintering problem of Ni particles, especially at high Ni loading. A series of Ni-phyllosilicate catalysts were prepared through the hydrothermal reaction of mesoporous SiO 2 nanorods (SRs) and nickel nitrate, followed by an impregnation modification of CeO 2 . Hydrothermal temperature played an important role in the formation of nickel phyllosilicate. A small amount of Ni-phyllosilicate with a Ni content of 18.56 or 23.88 wt % was formed at a low hydrothermal temperature of 120 or 160 °C, and a large amount of nanosheet-like Ni-phyllosilicate with the Ni content as high as 31.65 wt % was obtained at a high hydrothermal temperature of 200 °C. The prepared Niphyllosilicate catalysts were beneficial to obtain Ni particles with small sizes (3.3−6.3 nm), even though they were reduced at 750 °C and possessed high Ni loadings (18.56−31.65 wt %) owing to the surface and interface confinement of nickel phyllosilicate. After the modification of CeO 2 using an impregnation method, the CeO 2 promoter could further reduce the Ni particle size and increase hydrogen and carbon dioxide uptakes. The CeO 2 -modified Niphyllosilicate catalyst (NPS-180-5C) was the best catalyst in this work, which could reach the thermodynamic equilibrium of CO methanation above 350 °C and exhibited high catalytic activity for CO 2 methanation. In addition, for the 55 °C-100 h-lifetime test for CO 2 methanation and 600 °C-6 h-100% steam treatment tests, NPS-180-5C also showed an excellent antisintering property and higher hydrothermal stability than the impregnated one (N/SR-Im) owing to its special structure and confinement effect as well as promotion of CeO 2 species. In all, the CeO 2 -modified SR-derived Ni-phyllosilicate catalyst could not only effectively suppress the problem of easy sintering of metallic Ni particles on the conventional Ni/SiO 2 catalysts but also exhibit high catalytic activity and hydrothermal stability, which was a promising catalyst for both CO 2 and CO methanation reactions.

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Effect of surface properties controlled by Ce addition on CO2 methanation over Ni/Ce/Al2O3 catalyst

Cited by 76 publications

References 35 publications

Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO₂ Methanation

Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO₂ Methanation

Barium promoted Ni/Sm₂O₃ catalysts for enhanced CO₂ methanation

Highly Efficient Ni-Phyllosilicate Catalyst with Surface and Interface Confinement for CO₂ and CO Methanation

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Effect of surface properties controlled by Ce addition on CO2 methanation over Ni/Ce/Al2O3 catalyst

Cited by 76 publications

References 35 publications

Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO2 Methanation

Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO2 Methanation

Barium promoted Ni/Sm2O3 catalysts for enhanced CO2 methanation

Highly Efficient Ni-Phyllosilicate Catalyst with Surface and Interface Confinement for CO2 and CO Methanation

Contact Info

Product

Resources

About

Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO₂ Methanation

Highly Active Ce- and Mg-Promoted Ni Catalysts Supported on Cellulose-Derived Carbon for Low-Temperature CO₂ Methanation

Barium promoted Ni/Sm₂O₃ catalysts for enhanced CO₂ methanation

Highly Efficient Ni-Phyllosilicate Catalyst with Surface and Interface Confinement for CO₂ and CO Methanation