A study of Ni/La-Al2O3 catalysts: A competitive system for CO2 methanation

Garbarino, Gabriella; Wang, Chongyang; Cavattoni, Tullio; Finocchio, Elisabetta; Riani, Paola; Flytzani‐Stephanopoulos, Maria; Busca, Guido

doi:10.1016/j.apcatb.2018.12.063

Cited by 170 publications

(119 citation statements)

References 60 publications

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“…For the La 3d spectrum of the 20NA5L‐Ox catalyst, two peaks are observed at 835.7 and 839.3 eV, respectively (Figure b) . After reduction, these peaks shift to lower values at 835.3 and 838.8 eV (Figure b), which means that La 2 O 3 can be partially reduced from La 2 O 3 to La 2 O x ( x < 3) during the production of the catalyst . This is similar with the promotion of Sm 2 O 3 and TiO 2 over the ordered mesoporous Ni/Al 2 O 3 catalyst to intensify their catalytic activities for CO methanation, in which the electron cloud density of Ni was increased by electron transfer from Ti 4+ /Ti 3+ or Sm 3+ /Sm 2+ redox .…”

Section: Resultssupporting

confidence: 56%

“…Figure shows the N 2 adsorption–desorption curves and pore‐size distribution (PSD) curves of the calcined catalyst and γ ‐Al 2 O 3 support. As shown in Figure a, γ ‐Al 2 O 3 and 20NA catalyst show representative IV‐type curves with distinct H3 hysteresis loops . The shapes of both isotherms and hysteresis loops of 20NA x L and 20NA1L‐Im are similar with those of 20NA, indicating that the porous structure still remains after the doping of different amounts of La 2 O 3 species using the DP and co‐impregnation methods.…”

Section: Resultsmentioning

confidence: 80%

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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: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 80%

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

Zhang

Liu

2019

Energy Tech

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“…The 25Ni−3Mn−Al 2 O 3 catalyst with the highest BET surface area and the lowest crystalline size improved the low temperature activity and selectivity toward methane and passed a stable activity at 350 °C for 10 h in CO 2 methanation reaction. Garbarino et al . observed the effect of Ni/La−Al 2 O 3 catalysts on CO 2 methanation.…”

Section: Current Understanding Of Co2 Catalytic Hydrogenationmentioning

confidence: 99%

“…Many studies investigate the use of different promoter than ZnO in Cu‐based catalysts. According to the Bhanage et al . the CeO 2 has stronger basic sites than ZnO and may be a promising promoter.…”

Section: Current Understanding Of Co2 Catalytic Hydrogenationmentioning

confidence: 99%

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Recent Developments in the Modelling of Heterogeneous Catalysts for CO₂ Conversion to Chemicals

et al. 2020

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Density functional theory (DFT) of the CO2 behavior on the catalyst surface provides valuable insights about the C=O bond activation, information about adsorption and dissociation of CO2, understanding the elementary steps involved in the mechanism of the CO2 hydrogenation reaction. Nowadays, DFT computational studies for the catalytic hydrogenation of CO2 are becoming very popular. Therefore, this article is focused on a comprehensive review of the DFT studies in thermocatalytic hydrogenation of CO2 at the gas‐surface interface and discusses three aspects: 1) processes taking place on the surfaces and facets of transition metal heterogeneous catalysts, 2) adsorption of CO2 on surfaces of different transition metals; 3) current understanding of reaction mechanisms taking place on the catalytic surface for the production of different compounds. A detailed schematic overview of the possible CO2 hydrogenation mechanisms and DFT simulations presented here will enhance the current understanding of the CO2 catalytic hydrogenation.

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Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

Zhang

Chen

et al. 2020

AIChE Journal

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Carbon dioxide (CO 2) conversion is an important yet challenging topic, which helps to address climate change challenge. Catalytic CO 2 methanation is one of the methods to convert CO 2 , however, it is limited by kinetics. This work developed a structured Ni@NaA zeolite supported on silicon carbide (SiC) foam catalyst (i.e., Ni@NaA-SiC), which demonstrated an excellent performance with a CO 2 conversion of 82%, being comparable to the corresponding equilibrium conversion, and CH 4 selectivity of 95% at 400 C. The activation energy for CO 2 conversion over the 15Ni@NaA-SiC catalyst is about 31 kJ mol −1 , being significantly lower than that of the 15Ni@NaA pelletized catalyst (i.e., 84 kJ mol −1). Additionally, the structured catalyst was highly stable with sustained CO 2 conversion at 78.7 ± 1.4% and selectivity to CH 4 at 97.7 ± 0.2% over an 80 hr longevity test. In situ diffuse reflectance infrared Fourier transform spectroscopy-mass spectroscopy characterization revealed that catalysis over the structured catalyst proceeded primarily via the CO free mechanism.

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A study of Ni/La-Al2O3 catalysts: A competitive system for CO2 methanation

Cited by 170 publications

References 60 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

Recent Developments in the Modelling of Heterogeneous Catalysts for CO₂ Conversion to Chemicals

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

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A study of Ni/La-Al2O3 catalysts: A competitive system for CO2 methanation

Cited by 170 publications

References 60 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

Recent Developments in the Modelling of Heterogeneous Catalysts for CO2 Conversion to Chemicals

Structured Ni@NaA zeolite supported on silicon carbide foam catalysts for catalytic carbon dioxide methanation

Contact Info

Product

Resources

About

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

Recent Developments in the Modelling of Heterogeneous Catalysts for CO₂ Conversion to Chemicals