This research demonstrates enhanced coking resistance in bimetallic NiCo/CeO2-Al2O3 catalysts, suggesting a new strategy for dry reforming of methane.
Non-noble Ni-based catalysts are highly active for dry reforming of methane (DRM) but suffer from severe carbon deposition. To address this challenge, we synthesized Mo-modified bimetallic NiCo/CeO₂-Al₂O₃ catalysts via sol-gel method. We have demonstrated that an optimal Mo/Ni atomic ratio of 0.15 balances the trade-off between activity and coking resistance, achieving a stable 65% CH₄ conversion at 700 °C over 100 h of DRM while maintaining superior coke resistance. Based on comprehensive experimental analyses, we propose that during DRM, surface and interfacial MoOx species act as the oxygen pump (MOP), generating reactive oxygen (O*) from CO₂ dissociation and channeling it to adjacent components. By creating an oxygen-rich local chemical environment, this mechanism concurrently passivates the metal surface and progressively shifts the CH₄ activation pathway from deep decomposition to oxidative dehydrogenation, enabling efficient carbon elimination at the cost of reduced activity. This work elucidates the oxygen pumping effect of interfacial MoOx, providing a practicable strategy for designing coking-resistant catalysts for DRM and other high-temperature processes.
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Yu et al. (2026) studied this question.
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