Abstract:CF (tetrafluoromethane), a perfluorinated compound with high thermal stability and globalwarming potential, poses significant challenges for the conventional catalytic decomposition route dueto its robust C—F bonds and chemical inertness. Current thermal catalytic technologies, primarily usingaluminum-based catalysts, have demonstrated efficient CF decomposition but require reactiontemperatures exceeding 600 ℃, which is far beyond the maximum temperature of flue gas from actualaluminum electrolysis (140 ℃). Consequently, there is an urgent need to develop low-temperature CFcatalytic decomposition technologies to reduce greenhouse gas emissions from the aluminumelectrolysis industry. To address this challenge, researchers have proposed the strategy of couplingaluminum-based catalysts with low-temperature plasma. Notably, the hydroxyl-enriched mesoporousaluminum catalyst exhibits remarkable CF decomposition efficiency even at room temperature (25 ℃).Energy Environmental ProtectionThe key to this breakthrough lies in the formation of hydroxyl sites on the aluminum surface. Hydroxyl-enriched mesoporous aluminum has been successfully prepared through the sol-gel method usingaluminum isopropoxide as the aluminum source, which significantly enhances CF decompositionefficiency. Experimental results show that, under the reaction conditions of 10% CF concentration and10 mL/min flow rate, the highest decomposition efficiency of CF can reach 95% using a mesoporousaluminum catalyst coupled with plasma. Even at a flow rate of 50 mL/min, the decomposition rates canstill reach 70%. These findings underscore the potential of this new catalyst in practical applications.Compared to commercial alumina, mesoporous aluminum demonstrates superior properties.Specifically, the strong acidic sites and hydroxyl content of mesoporous aluminum are 16.2% and118.0% higher, respectively. The surface of mesoporous aluminum contains higher densities of acidicand basic sites, with the weak basic sites being Al—OH and strong basic sites being active oxygenspecies such as O. During the CF decomposition reaction, the Al—OH groups on the surface ofmesoporous aluminum participate in the decomposition process, transforming CF into carbon (C) andaluminum fluoride (AlF). These products deposit on the catalyst surface, leading to pore blockage anda subsequent decrease in CF decomposition efficiency after prolonged reaction. The hydroxyl groupplays a pivotal role in CF decomposition by serving as a proton donor and an active site. Its dualfunctionality as a Brønsted acid and a base enhances the overall performance of CF decomposition.The presence of hydroxyl groups facilitates the breakdown of CF and improves the catalyst's stabilityand longevity, making it a promising solution for reducing greenhouse gas emissions from aluminumelectrolysis processes in industrial applications. Close-