Converting natural gas into valuable chemical feedstocks is a long-standing goal in clean energy research. As a classic chemical reaction, the partial oxidation of methane has long offered a promising shortcut to produce syngas, an essential building block for synthetic fuels. Compared to traditional steam reforming, this established process is far more energy-efficient. However, it has been plagued by a fundamental roadblock: cracking methane's stubborn chemical bonds requires high temperatures, and affordable nickel catalysts quickly oxidize and deactivate under reaction conditions.
To pour "new wine" into this old reaction, a research team designed an advanced catalyst by combining nickel with molybdenum carbide, discovering a completely new operational pathway.
Through detailed experimental analysis and computer modeling, the researchers revealed that a unique interface forms naturally on the catalyst surface during the reaction. Instead of allowing oxygen to attack and deactivate the active nickel, the molybdenum carbide acts as a smart oxygen regulator. It selectively traps oxygen to form temporary oxycarbide species, shielding the underlying nickel and keeping it active.
Crucially, this setup unlocks a new reaction mechanism. Rather than following the traditionally debated pathways, the trapped oxygen directly assists in breaking methane's chemical bonds. This helper role significantly lowers the energy barrier for methane activation while preventing oxygen and methane from competing for the same active sites.
In laboratory tests at 720 °C, the optimized catalyst converted 94 percent of methane into syngas with an impressive 99 percent selectivity. During long-term operations, it ran smoothly for 75 hours with almost no loss in activity, demonstrating nearly seven times the stability of standard nickel catalysts. By discovering this new pathway for an established reaction, the study provides a practical blueprint for designing durable, oxidation-resistant catalysts across industrial chemical processes.
Science Bulletin
Experimental study