CO and CO2 methanation over Ni catalysts supported on alumina with different crystalline phases

Le, Thien An; Kim, Tae Wook; Lee, Sae Ha; Park, Eun Duck

doi:10.1007/s11814-017-0257-0

Cited by 47 publications

(33 citation statements)

References 32 publications

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“…In addition, the Ni crystal sizes calculated by the Debye–Scherrer equation are listed in Table . The Ni crystal size of 20NA is 5.1 nm, whereas those of the 20NA x L catalyst are smaller, which may be because of the fact that the La 2 O 3 species can act as the physical barrier for Ni particles to inhibit the sintering during the reduction or reaction process at high temperatures . On the contrary, the Ni crystal size of the catalyst 20NA1L‐Im is larger than those of 20NA, which indicates that the catalyst prepared by the co‐impregnation method has poor Ni dispersion and is easy to aggregate at high temperatures.…”

Section: Resultsmentioning

confidence: 99%

La₂O₃‐Promoted Ni/Al₂O₃ Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

Zhang

Liu

2019

Energy Tech

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To simultaneously inhibit Ni sintering and coke formation, while maintaining high catalytic activity, Ni–La2O3/Al2O3 catalysts are prepared by a modified deposition–precipitation (DP) method and applied for the CO methanation reaction. The activity of the catalyst prepared by the DP method is much higher than those prepared by the traditional impregnation and co‐impregnation methods due to the promotion of La2O3 as well as its unique dispersion on the surface of the catalyst. In the 100 h‐lifetime test under the conditions of 450 °C, 0.1 MPa, a weight hourly space velocity (WHSV) of 120 000 mL g−1 h−1, the Ni–La2O3/Al2O3 catalyst prepared by the DP method shows high catalytic stability. The characterization results show that La2O3 species can be deposited on the surface of the catalyst during the preparation process and can act as a physical barrier to prevent sintering of Ni particles and coke formation during high‐temperature reduction and reaction. La2O3 species can improve the reducibility of Ni particles and decrease the Ni particle sizes, resulting in larger H2 uptake and higher catalytic activity. Furthermore, the La3+/La2+ redox can also decrease coke formation by increasing the active oxygen species on the Ni surface.

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Section: Resultsmentioning

confidence: 99%

La₂O₃‐Promoted Ni/Al₂O₃ Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

Zhang

Liu

2019

Energy Tech

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“…In general, the TPR peak in the low-temperature range (210-250 • C) was due to the presence of NiO interacting weakly with the support. The high-temperature TPR peak in the temperature range (400-500 • C) indicated reduction of NiO species interacting strongly with the support [6,9,12]. A small negative TPR peak could be seen around 600 • C for the catalysts supported by Al@MAl 2 O 4 (M = Zn, Mg, or Mn), which could be attributed to the melting of Al core material.…”

Section: Characterization Of Catalystsmentioning

confidence: 92%

“…Therefore, development of a catalyst that is very active at low temperatures, as well as application of a highly thermal conduction material, is desirable to guarantee low-temperature operation without hotspots in the catalyst bed. Ni-based catalysts have been widely used in commercial methanation processes, based on their reasonable activity level, low cost, and high availability, compared with noble metal catalysts [4][5][6][7][8][9][10][11][12][13][14][15][16]. It has been reported that the low thermal conductivity of the ceramic support might cause metal sintering, especially for highly exothermic reactions [17,18].…”

Section: Introductionmentioning

confidence: 99%

CO2 Methanation over Ni/Al@MAl2O4 (M = Zn, Mg, or Mn) Catalysts

Kim

Jeong

et al. 2019

Catalysts

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In this study, unique core-shell aluminate spinel supports, Al@MAl2O4 (M = Zn, Mg, or Mn), were obtained by simple hydrothermal surface oxidation and were applied to the preparation of supported Ni catalysts for CO2 methanation. For comparison, CO methanation was also evaluated using the same catalysts. The prepared catalysts were characterized with a variety of techniques, including N2 physisorption, CO2 chemisorption, H2 chemisorption, temperature-programmed reduction with H2, temperature-programmed desorption of CO2, X-ray diffraction, high-resolution transmission electron microscopy, and in-situ diffuse reflectance infrared Fourier transform spectroscopy. The combination of supports with core-shell spinel structures and Ni doping with a deposition–precipitation method created outstanding catalytic performance of the Ni catalysts supported on Al@MgAl2O4 and Al@MnAl2O4 due to improved dispersion of Ni nanoparticles and creation of moderate basic sites with suitable strength. Good stability of Ni/Al@MnAl2O4 catalyst was also confirmed in the study.

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“…As we know, excellent support can effectively improve the dispersion of active metals and the stability of the catalyst. Al 2 O 3 , SiO 2 , TiO 2 , and SiC have been widely used as support for the nickel‐based catalyst. Among them, Al 2 O 3 is most widely used due to its relatively excellent pore structure and low cost .…”

Section: Introductionmentioning

confidence: 99%

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

et al. 2020

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To address the problems of sintering of Ni particles and poor low‐temperature activity of Ni‐based catalysts for CO methanation, MoOx‐doped (x < 3) ordered mesoporous Ni/Al2O3 catalysts are prepared by two different methods, including the impregnation method and evaporation‐induced self‐assembly (EISA) method. The samples before and after the catalytic reaction are thoroughly characterized by scanning electron microscopy and transmission electron microscopy. The ordered mesoporous structure is retained in all catalysts, whereas the ones prepared by the EISA method demonstrate high specific surface area, small Ni particle size, and high metal dispersion. After reduction in H2 flow, the Mo promoter is in the form of MoOx (x < 3) with the mixed valence of Mo (IV) and Mo (VI), which can increase the density of Ni atomic electron clouds and reduce the Ni particle size. The optimal mesoporous Ni‐Mo/Al2O3 catalyst reaches the maximum CO conversion and CH4 yield of 97.9% and 93.8%, respectively, at 375 °C, 0.1 MPa, and a weight hourly space velocity of 60 000 mL g−1 h−1. In addition, this catalyst demonstrates excellent stability in 100 h‐lifetime test at high space velocity owing to the confinement of the ordered mesoporous structure and the addition of MoOx promoter.

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CO and CO2 methanation over Ni catalysts supported on alumina with different crystalline phases

Cited by 47 publications

References 32 publications

La₂O₃‐Promoted Ni/Al₂O₃ Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

La₂O₃‐Promoted Ni/Al₂O₃ Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

CO2 Methanation over Ni/Al@MAl2O4 (M = Zn, Mg, or Mn) Catalysts

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation

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CO and CO2 methanation over Ni catalysts supported on alumina with different crystalline phases

Cited by 47 publications

References 32 publications

La2O3‐Promoted Ni/Al2O3 Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

La2O3‐Promoted Ni/Al2O3 Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

CO2 Methanation over Ni/Al@MAl2O4 (M = Zn, Mg, or Mn) Catalysts

MoOx‐Doped Ordered Mesoporous Ni/Al2O3 Catalyst for CO Methanation

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La₂O₃‐Promoted Ni/Al₂O₃ Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

La₂O₃‐Promoted Ni/Al₂O₃ Catalyst for CO Methanation: Enhanced Catalytic Activity and Stability

MoO_x‐Doped Ordered Mesoporous Ni/Al₂O₃ Catalyst for CO Methanation