Enhancing CO2 methanation over Ni catalysts supported on sol-gel derived Pr2O3-CeO2: An experimental and theoretical investigation

Tsiotsias, Anastasios I.; Charisiou, Nikolaos D.; Harkou, Eleana; Hafeez, Sanaa; Manos, George; Constantinou, Achilleas; Hussien, Aseel Gamal Suliman; Dabbawala, Aasif A.; Sebastián, Víctor; Hinder, Steven J.; Baker, Mark; Polychronopoulou, Kyriaki; Goula, Maria A.

doi:10.1016/j.apcatb.2022.121836

Cited by 44 publications

(9 citation statements)

References 77 publications

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“…These findings highlight the importance of carefully selecting and optimizing the preparation method to achieve the desired catalytic properties in the resulting materials. It was also previously reported by Simone et al and Maria A. et al…”

Section: Resultssupporting

confidence: 84%

Preparation of a Nanostructured Ni/CaO·Al₂O₃ Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Pirzadi,

Meshkani

2024

Ind. Eng. Chem. Res.

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Four nickel nanostructure catalysts supported on the CaO•Al 2 O 3 (CA) support were synthesized with different synthesis procedures (i.e., coprecipitation, evaporation-induced self-assembly, sol−gel, and autocombustion) and have been investigated in a glycerol CO 2 -reforming reaction. The nitrogen adsorption−desorption, SEM, XRD, TEM, H 2 -TPR, O 2 -TPO, TGA, and FTIR techniques were used to characterize prepared Ni/CaO•Al 2 O 3 catalysts, and their catalytic performances were evaluated at 600− 750 °C, atmospheric pressure, and a CO 2 /glycerol ratio of 1. It was demonstrated that the preparation route strongly influenced the structural, textural, and chemical features of the as-prepared samples. The maximal conversion of glycerol (ca. 55% at 750 °C) was obtained over the Ni/CA sample prepared by the sol−gel technique. It also exhibited better catalytic stability during the 25 h of the dry reforming reaction. The smaller Ni crystalline size (16.7 nm) and high Ni dispersion with strong interaction with the CaO•Al 2 O 3 support for this sample can result in superior catalytic performance and stability compared with other synthesized samples. This synthesis procedure was sensitive to the solvent type, and the physicochemical property was significantly affected by changing the solvent; therefore, it should be noted as a significant parameter for this preparation method. For the investigation of this parameter, three solvents, including methanol, ethanol, and propanol, were applied in the sol−gel method, and the obtained results imply that employing ethanol as a solvent in this method resulted in achieving better structural properties as well as higher catalytic efficiency in the glycerol CO 2 -reforming reaction. As a result, the simple sol−gel technique was successful for the preparation of the Ni/CaO• Al 2 O 3 sample with high potential as a catalyst for glycerol CO 2 -reforming.

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Section: Resultssupporting

confidence: 84%

Preparation of a Nanostructured Ni/CaO·Al₂O₃ Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Pirzadi,

Meshkani

2024

Ind. Eng. Chem. Res.

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“…Up to 6 wt % Na 2 O (Na6Al, 0.11 Na/Al molar ratio), the surface area and pore volume drop only modestly, since the low Na 2 O load is not able to block the support’s mesopores. 55 For 12 wt % Na 2 O (Na12Al, 0.22 Na/Al molar ratio), S BET decreases to 133 m 2 /g, whereas V P drops to 0.43 cm 3 /g. Despite this, the Na12Al sample retains a relatively high porosity due to the initially highly porous Al 2 O 3 structure; its high CO 2 adsorption capacity being due to a combination of high Na 2 O load (thus a plethora of adsorption sites) and sufficient porosity.…”

Section: Resultsmentioning

confidence: 99%

“…It is evident, that as the Na 2 O load increases, the porosity in terms of both SSA ( S BET ) and pore volume ( V P ) decreases, whereas the pore size distribution shifts toward larger pores. Up to 6 wt % Na 2 O (Na6Al, 0.11 Na/Al molar ratio), the surface area and pore volume drop only modestly, since the low Na 2 O load is not able to block the support’s mesopores . For 12 wt % Na 2 O (Na12Al, 0.22 Na/Al molar ratio), S BET decreases to 133 m 2 /g, whereas V P drops to 0.43 cm 3 /g.…”

Section: Resultsmentioning

confidence: 99%

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

Tsiotsias,

Georgiadis,

Charisiou

et al. 2024

ACS Omega

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CO 2 adsorbents comprising various alkaline sorption active phases supported on mesoporous Al 2 O 3 were prepared. The materials were tested regarding their CO 2 adsorption behavior in the mid-temperature range, i.e., around 300 °C, as well as characterized via XRD, N 2 physisorption, CO 2 -TPD and TEM. It was found that the Na 2 O sorption active phase supported on Al 2 O 3 (originated following NaNO 3 impregnation) led to the highest CO 2 adsorption capacity due to the presence of CO 2 -philic interfacial Al−O − −Na + sites, and the optimum active phase load was shown to be 12 wt % (0.22 Na/Al molar ratio). Additional adsorbents were prepared by dispersing Na 2 O over different metal oxide supports (ZrO 2 , TiO 2 , CeO 2 and SiO 2 ), showing an inferior performance than that of Na 2 O/Al 2 O 3 . The kinetics and thermodynamics of CO 2 adsorption were also investigated at various temperatures, showing that CO 2 adsorption over the best-performing Na 2 O/Al 2 O 3 material is exothermic and follows the Avrami model, while tests under varying CO 2 partial pressures revealed that the Langmuir isotherm best fits the adsorption data. Lastly, Na 2 O/Al 2 O 3 was tested under multiple CO 2 adsorption−desorption cycles at 300 and 500 °C, respectively. The material was found to maintain its CO 2 adsorption capacity with no detrimental effects on its nanostructure, porosity and surface basic sites, thereby rendering it suitable as a reversible CO 2 chemisorbent or as a support for the preparation of dual-function materials.

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“…In principle, catalyst materials should contain active components with variable valence states to produce adsorption sites for activated reactants. Among all transition metal oxides, cerium (Ce) oxides are widely used as catalytic carriers due to their robust oxygen storage capacity, oxygen mobility, metal carrier interactions, and interchangeability of Ce 3+ and Ce 4+ oxidation states. − In addition, it was found that Ru and Ni exhibited relatively high CO 2 methanation activity. − Although Ru is the most active component for CO 2 methanation reactions, large-scale industrial applications of Ru are prohibitive due to the high cost and scarcity. In comparison, Ni catalysts are frequently used due to their comparable catalytic performance to precious metals. , Therefore, Ni-based catalysts have been extensively investigated for CO 2 methanation. − To further increase the CO 2 methanation reaction rate of Ni-based catalysts, yttrium species (Y) have been selected as catalyst additives due to their abundant basic sites, which are favorable for CO 2 adsorption and activation.…”

Section: Introductionmentioning

confidence: 99%

High Stability of the Ni–YCe/Diatomite Catalyst for CO₂ Methanation: The Synergistic Coupling of Citric Acid and Y₂O₃

Liu,

Wang,

et al. 2023

ACS Sustainable Chem. Eng.

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Carbon dioxide (CO 2 ) methanation exhibits great potential for achieving high-value utilization of CO 2 to fulfill the goal of carbon neutrality. Here, a novel nickel−yttrium−cerium/diatomite (Ni−YCe/Dia) composite was constructed by the in situ growth of thin membrane-like Ni−YCe oxides on the Dia template. Distinct from conventional Ni-based catalysts, Dia improved the dispersion of Ni−YCe oxide nanoparticles and provided extra hydroxyl groups for CO 2 adsorption; citric acid remarkably enhanced the dispersion of Ni species, thus creating favorable conditions for the rapid dissociation of H 2 ; most importantly, introducing Y species improved the dispersion of Ni nanoparticles and the anti-carbon deposition capacity of the catalysts. Such characteristics endow Ni−YCe/Dia composites with exceptional catalytic activity for CO 2 methanation, with more than 85% CO 2 conversion and 99% CH 4 selectivity in a stability test up to 150 h, which is better than most reported Nibased catalysts. In situ DRIFTS analysis revealed that the −OH groups on the surface of Dia exhibited a remarkable ability to activate CO 2 . This study provides a new perspective on the rational regulating of structural assemblage between metal oxides and natural minerals for high-performance CO 2 methanation.

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Enhancing CO2 methanation over Ni catalysts supported on sol-gel derived Pr2O3-CeO2: An experimental and theoretical investigation

Cited by 44 publications

References 77 publications

Preparation of a Nanostructured Ni/CaO·Al₂O₃ Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Preparation of a Nanostructured Ni/CaO·Al₂O₃ Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

High Stability of the Ni–YCe/Diatomite Catalyst for CO₂ Methanation: The Synergistic Coupling of Citric Acid and Y₂O₃

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Enhancing CO2 methanation over Ni catalysts supported on sol-gel derived Pr2O3-CeO2: An experimental and theoretical investigation

Cited by 44 publications

References 77 publications

Preparation of a Nanostructured Ni/CaO·Al2O3 Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Preparation of a Nanostructured Ni/CaO·Al2O3 Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Mid-temperature CO2 Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al2O3

High Stability of the Ni–YCe/Diatomite Catalyst for CO2 Methanation: The Synergistic Coupling of Citric Acid and Y2O3

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Preparation of a Nanostructured Ni/CaO·Al₂O₃ Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Preparation of a Nanostructured Ni/CaO·Al₂O₃ Catalyst for Syngas Production via Glycerol Dry Reforming: Role of the Preparation Method

Mid-temperature CO₂ Adsorption over Different Alkaline Sorbents Dispersed over Mesoporous Al₂O₃

High Stability of the Ni–YCe/Diatomite Catalyst for CO₂ Methanation: The Synergistic Coupling of Citric Acid and Y₂O₃