Recent Advances in Coke Management for Dry Reforming of Methane over Ni-Based Catalysts
Dry reforming of methane (DRM) is a promising method for reducing greenhouse gas emissions by converting CO₂ and CH₄ into syngas (CO and H₂). Ni-based catalysts are widely studied for DRM, but their performance is limited by carbon deposition. This review explores mechanisms of carbon-induced catalyst deactivation and recent strategies for controlling carbon deposition through coke-resistant Ni-based catalysts. It emphasizes the importance of support, alloy, and structural strategies in improving catalytic performance and stability.
The DRM process involves the reaction of CH₄ with CO₂ to produce syngas, but carbon deposition occurs through pathways such as CH₄ cracking and the Boudouard reaction, leading to catalyst deactivation. Recent studies have focused on mitigating carbon deposition through various strategies, including the use of supports like CeO₂, La₂O₃, ZrO₂, and MgO, which enhance oxygen mobility, thermal stability, and carbon resistance. Bimetallic and alloyed Ni-based catalysts, such as Rh-Ni, Ru-Ni, Pt-Ni, Co-Ni, and Fe-Ni, have shown improved resistance to carbon deposition through synergistic effects, enhanced oxygen activation, and controlled carbon gasification.
Supports like CeO₂ and La₂O₃ enhance oxygen storage and mobility, while zeolites and silicalite-1 confine metal particles to prevent carbon deposition. Bimetallic catalysts, particularly those with a 3:1 Ni/Co ratio, exhibit enhanced carbon resistance due to synergistic interactions and improved oxygen activation. The Ni/Co ratio and surface structure significantly influence catalytic performance, with optimal ratios and structures minimizing carbon formation.
Alloys like Ni-Co and Ni-Fe show improved resistance to carbon deposition through redox cycling, enhanced oxygen storage, and controlled carbon gasification. The synthesis method and support modification also play critical roles in enhancing catalytic performance and reducing carbon deposition. Overall, the development of coke-resistant Ni-based catalysts is crucial for the efficient and sustainable DRM process.Recent Advances in Coke Management for Dry Reforming of Methane over Ni-Based Catalysts
Dry reforming of methane (DRM) is a promising method for reducing greenhouse gas emissions by converting CO₂ and CH₄ into syngas (CO and H₂). Ni-based catalysts are widely studied for DRM, but their performance is limited by carbon deposition. This review explores mechanisms of carbon-induced catalyst deactivation and recent strategies for controlling carbon deposition through coke-resistant Ni-based catalysts. It emphasizes the importance of support, alloy, and structural strategies in improving catalytic performance and stability.
The DRM process involves the reaction of CH₄ with CO₂ to produce syngas, but carbon deposition occurs through pathways such as CH₄ cracking and the Boudouard reaction, leading to catalyst deactivation. Recent studies have focused on mitigating carbon deposition through various strategies, including the use of supports like CeO₂, La₂O₃, ZrO₂, and MgO, which enhance oxygen mobility, thermal stability, and carbon resistance. Bimetallic and alloyed Ni-based catalysts, such as Rh-Ni, Ru-Ni, Pt-Ni, Co-Ni, and Fe-Ni, have shown improved resistance to carbon deposition through synergistic effects, enhanced oxygen activation, and controlled carbon gasification.
Supports like CeO₂ and La₂O₃ enhance oxygen storage and mobility, while zeolites and silicalite-1 confine metal particles to prevent carbon deposition. Bimetallic catalysts, particularly those with a 3:1 Ni/Co ratio, exhibit enhanced carbon resistance due to synergistic interactions and improved oxygen activation. The Ni/Co ratio and surface structure significantly influence catalytic performance, with optimal ratios and structures minimizing carbon formation.
Alloys like Ni-Co and Ni-Fe show improved resistance to carbon deposition through redox cycling, enhanced oxygen storage, and controlled carbon gasification. The synthesis method and support modification also play critical roles in enhancing catalytic performance and reducing carbon deposition. Overall, the development of coke-resistant Ni-based catalysts is crucial for the efficient and sustainable DRM process.