The tendency of supports to generate oxygen vacancies and the catalytic performance of Ni/ZrO<sub>2</sub> and Ni/Mg(Al)O in CO<sub>2</sub> methanation

Everett-Espino, Oliver E; Zonetti, Priscila C.; Mancera, Rafael C.; Costa, Luciano T.; Alves, Odivaldo C.; Spadotto, J.C.; Appel, Lucia G.; Avillez, Roberto R. de

doi:10.1039/d1cy01915e

Cited by 17 publications

(8 citation statements)

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“…( b ) Selectivity to CH 4 (squares) and CO (triangles) versus temperature. The catalyst colors and the experimental conditions are the same as in ( a ) [ 76 ]. Copyright (2022) Catalysis Science & Technology.…”

Section: Figurementioning

confidence: 99%

“…Copyright (2021) Fuel.ZrO 2 has abundant active and basic sites on its surface, good thermal stability, and high porosity[64]. Espino et al[76] studied the performance of Ni/ZrO 2 , Ni/Mg(Al)O, and Ni/SiO 2 catalysts in the CO 2 methanation reaction and found that the Ni/ZrO 2 catalyst has the highest CO 2 conversion rate and CH 4 selectivity (98%), as shown in Figure9. Due to the insertion of Ni into the ZrO 2 lattice and its own defects, oxygen vacancy was generated, which improved the adsorption and dissociation of CO on the Ni/ZrO 2 catalyst.CeO 2 has a high specific surface area and abundant oxygen vacancy[77].…”

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confidence: 99%

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Research Progress of Non-Noble Metal Catalysts for Carbon Dioxide Methanation

Cui,

He,

Yang

et al. 2024

Molecules

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The extensive utilization of fossil fuels has led to a rapid increase in atmospheric CO2 concentration, resulting in various environmental issues. To reduce reliance on fossil fuels and mitigate CO2 emissions, it is important to explore alternative methods of utilizing CO2 and H2 as raw materials to obtain high-value-added chemicals or fuels. One such method is CO2 methanation, which converts CO2 and H2 into methane (CH4), a valuable fuel and raw material for other chemicals. However, CO2 methanation faces challenges in terms of kinetics and thermodynamics. The reaction rate, CO2 conversion, and CH4 yield need to be improved to make the process more efficient. To overcome these challenges, the development of suitable catalysts is essential. Non-noble metal catalysts have gained significant attention due to their high catalytic activity and relatively low cost. In this paper, the thermodynamics and kinetics of the CO2 methanation reaction are discussed. The focus is primarily on reviewing Ni-based, Co-based, and other commonly used catalysts such as Fe-based. The effects of catalyst supports, preparation methods, and promoters on the catalytic performance of the methanation reaction are highlighted. Additionally, the paper summarizes the impact of reaction conditions such as temperature, pressure, space velocity, and H2/CO2 ratio on the catalyst performance. The mechanism of CO2 methanation is also summarized to provide a comprehensive understanding of the process. The objective of this paper is to deepen the understanding of non-noble metal catalysts in CO2 methanation reactions and provide insights for improving catalyst performance. By addressing the limitations of CO2 methanation and exploring the factors influencing catalyst effectiveness, researchers can develop more efficient and cost-effective catalysts for this reaction.

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Section: Figurementioning

confidence: 99%

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confidence: 99%

Research Progress of Non-Noble Metal Catalysts for Carbon Dioxide Methanation

Cui,

He,

Yang

et al. 2024

Molecules

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“…Surface oxygen vacancies can promote CO 2 adsorption and activation on catalyst surfaces. In recent years, substantial research efforts have focused on developing robust catalysts with tunable oxygen vacancies to improve CO 2 conversion efficiency [22,58,59]. Controlling the number and distribution of oxygen vacancies enables precise regulation of the adsorption and activation of reactants during CO 2 conversion.…”

Section: Catalytic Performance In Liquid Phasementioning

confidence: 99%

Enhancing DMC Production from CO2: Tuning Oxygen Vacancies and In Situ Water Removal

Wang,

Li,

et al. 2024

Energies

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The direct synthesis of dimethyl carbonate (DMC) from methanol and CO2 presents an attractive route to turn abundant CO2 into value-added chemicals. However, insufficient DMC yields arise due to the inert nature of CO2 and the limitations of reaction equilibrium. Oxygen vacancies are known to facilitate CO2 activation and improve catalytic performance. In this work, we have demonstrated that tuning oxygen vacancies in catalysts and implementing in situ water removal can enable highly efficient DMC production from CO2. CexZryO2 nanorods with abundant oxygen vacancies were synthesized via a hydrothermal method. In liquid-phase DMC synthesis, the Ce10Zr1O2 nanorods exhibited a 1.7- and 1.4-times higher DMC yield compared to CeO2 nanoparticles and undoped CeO2 nanorods, respectively. Zr doping yielded a CeZr solid solution with increased oxygen vacancies, promoting CO2 adsorption and activation. In addition, adding 2-cyanopyridine as an organic dehydrating agent achieved an outstanding 87% methanol conversion and >99% DMC selectivity by shifting the reaction equilibrium to the desired product. Moreover, mixing CeO2 nanoparticles with hydrophobic fumed SiO2 in gas-phase DMC synthesis led to a doubling of DMC yield. This significant increase was attributed to the faster diffusion of water molecules away from the catalyst surface, facilitated by the hydrophobic SiO2. This study illustrates an effective dual strategy of enhancing oxygen vacancies and implementing in situ water removal to boost DMC production from CO2. The strategy can also be applied to other reactions impacted by water accumulation.

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“…The Ni nanoparticles on SiO2 were larger than those on P-CeO2 and H-CeO2 with abundant OVs (Table S1). No significant Ov signals were observed for the Ni/C-CeO2, Ni/P-CeO2, and Ni/H-CeO2 catalysts because the strong signal from Ni 0 hindered the other catalysts [39,40] (Fig. S4).…”

Section: Structure Of Catalystsmentioning

confidence: 99%

Ni nanoparticle coupled surface oxygen vacancies for efficient synergistic conversion of palmitic acid into alkanes

Zeng

Wang

Yang

et al. 2023

Chinese Journal of Catalysis

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The tendency of supports to generate oxygen vacancies and the catalytic performance of Ni/ZrO₂ and Ni/Mg(Al)O in CO₂ methanation

Abstract: The Ni/ZrO2, Ni/Mg(Al)O, and Ni/SiO2 catalysts were employed in the CO2 methanation. The catalysts were characterized by XPS, XRF, XRD (Rietveld refinement method), TPR, EPR, BET, CO2+H2-TPSR, CO+H2-TPSR, CO2-TPD, CO-TPD,...

Cited by 17 publications

References 70 publications

Research Progress of Non-Noble Metal Catalysts for Carbon Dioxide Methanation

Research Progress of Non-Noble Metal Catalysts for Carbon Dioxide Methanation

Enhancing DMC Production from CO2: Tuning Oxygen Vacancies and In Situ Water Removal

Ni nanoparticle coupled surface oxygen vacancies for efficient synergistic conversion of palmitic acid into alkanes

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The tendency of supports to generate oxygen vacancies and the catalytic performance of Ni/ZrO2 and Ni/Mg(Al)O in CO2 methanation

Abstract: The Ni/ZrO2, Ni/Mg(Al)O, and Ni/SiO2 catalysts were employed in the CO2 methanation. The catalysts were characterized by XPS, XRF, XRD (Rietveld refinement method), TPR, EPR, BET, CO2+H2-TPSR, CO+H2-TPSR, CO2-TPD, CO-TPD,...

Cited by 17 publications

References 70 publications

Research Progress of Non-Noble Metal Catalysts for Carbon Dioxide Methanation

Research Progress of Non-Noble Metal Catalysts for Carbon Dioxide Methanation

Enhancing DMC Production from CO2: Tuning Oxygen Vacancies and In Situ Water Removal

Ni nanoparticle coupled surface oxygen vacancies for efficient synergistic conversion of palmitic acid into alkanes

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Product

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The tendency of supports to generate oxygen vacancies and the catalytic performance of Ni/ZrO₂ and Ni/Mg(Al)O in CO₂ methanation