Elemental Fe conditioning for the synthesis of highly selective and stable high entropy catalysts for CO2 methanation

Liao, Yaqin; He, Yan; Cui, Xuemin; Liu, Leping

doi:10.1016/j.fuel.2023.129494

Cited by 13 publications

(1 citation statement)

References 71 publications

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“…The structural and thermal stability of HEOs promises gas-phase catalytic reactions at high temperatures; however, there have been limited reports on HEO thermal catalysts for high-temperature gas-phase reactions. 36–38 The reverse water–gas shift (RWGS) reaction converts CO 2 into CO, which can then be converted into hydrocarbons via the subsequent Fischer–Tropsch reaction. 39 The RWGS reaction is reversible and endothermic.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)₃O₄ spheres and their application to the reverse water–gas shift reaction as catalysts

Taniguchi,

Fujita,

Kobiro

2024

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)₃O₄ spheres and their application to the reverse water–gas shift reaction as catalysts

Taniguchi,

Fujita,

Kobiro

2024

Dalton Trans.

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Auto‐Pressurized Multi‐Stage Tesla‐Valve Type Microreactors in Carbon Monoliths Obtained Through 3D Printing: Impact of Design on Fluid Dynamics and Catalytic Activity

Parra‐Marfil,

Aguilar‐Madera,

Pérez‐Cadenas

et al. 2024

Adv Funct Materials

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The present research exploits an innovative methodology for producing auto‐pressurized carbon microreactors with a precise and controlled structure analyzing the influence of their design on the fluid dynamics and their catalytic performance. Carbon monoliths with Tesla‐valve shape channels (Tesla, T, and modified Tesla, Tm) are synthesized through the combination of 3D printing and sol–gel process and further probed as Ni/CeO2 supports on CO2 methanation. The experimental results and mathematical modeling corroborated the improved performance obtained through the complex design compared to a conventional one. In addition to chaotic fluid flow induced by the deviation in flow direction, which improves the reagents‐active phase interaction, local pressure increases due to convergence of flows may enhance the Sabatier reaction according to Le Châtelier's principle. Conversely to straight channels, T and Tm are not affected by flow rate and presented chemical control. Tesla‐valve with curved angle (Tm) improved the mass transfer, achieving higher conversion and ≈30% reaction rate increase regarding right angle (T). Thus, this auto‐pressurized multi‐stage Tesla‐valve monolith opens the gate to design specific and advanced functional materials for multitude chemical reactions where not only the reactant‐active phase contact can be maximized but also the reaction conditions can be controlled to maximize the reaction kinetics.

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Comparative Study of Porous High‐Entropy Oxides as Low‐Temperature Catalysts for CO₂ Methanation

Knorpp,

Mielniczuk,

Nikolic

et al. 2024

Eur J Inorg Chem

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High‐entropy oxides (HEOs) are an emerging class of materials whose compositional complexity has garnered attention because of their tailorable chemistries and unique properties arising from extreme configurational entropy. Solid‐state methods are often employed to synthesize HEOs, but such methods result in poor material properties for catalytic processes, leaving HEOs less studied for catalysis. Here we utilize different wet‐synthesis strategies to produce porous HEOs and investigate their performance in heterogeneous CO2 hydrogenation to methane. Specifically, HEOs were synthesized using hydrothermal, co‐precipitation, and solvothermal methods, resulting in different morphologies like platelets or spheres. Of the tested materials, HEOs with 2‐D platelets derived from hydrothermally‐synthesized high‐entropy layered double hydroxides had superior catalytic performance, especially in low‐temperature regimes (<300°C). K‐edge XANES indicated that metallic sites (Ni0‐Co0) were formed during the reaction, and these metallic sites are dispersed into the HEO matrix which is confirmed by STEM/elemental mapping. This facile synthesis approach allows for realized synergy between the metallic sites and the HEO support, leading to superior performance for CO2 methanation compared to low‐entropy counterparts. Finally, this study illustrates how HEOs offer new avenues of tailorability in terms of the interplay between support, active site and reaction temperatures for heterogeneous catalysis.

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Elemental Fe conditioning for the synthesis of highly selective and stable high entropy catalysts for CO2 methanation

Cited by 13 publications

References 71 publications

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)₃O₄ spheres and their application to the reverse water–gas shift reaction as catalysts

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)₃O₄ spheres and their application to the reverse water–gas shift reaction as catalysts

Auto‐Pressurized Multi‐Stage Tesla‐Valve Type Microreactors in Carbon Monoliths Obtained Through 3D Printing: Impact of Design on Fluid Dynamics and Catalytic Activity

Comparative Study of Porous High‐Entropy Oxides as Low‐Temperature Catalysts for CO₂ Methanation

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Elemental Fe conditioning for the synthesis of highly selective and stable high entropy catalysts for CO2 methanation

Cited by 13 publications

References 71 publications

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)3O4 spheres and their application to the reverse water–gas shift reaction as catalysts

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)3O4 spheres and their application to the reverse water–gas shift reaction as catalysts

Auto‐Pressurized Multi‐Stage Tesla‐Valve Type Microreactors in Carbon Monoliths Obtained Through 3D Printing: Impact of Design on Fluid Dynamics and Catalytic Activity

Comparative Study of Porous High‐Entropy Oxides as Low‐Temperature Catalysts for CO2 Methanation

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Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)₃O₄ spheres and their application to the reverse water–gas shift reaction as catalysts

Low-temperature synthesis of porous high-entropy (CoCrFeMnNi)₃O₄ spheres and their application to the reverse water–gas shift reaction as catalysts

Comparative Study of Porous High‐Entropy Oxides as Low‐Temperature Catalysts for CO₂ Methanation