Galvanic Displacement Engineered Pt/Co₃O₄‐CeO₂ for High‐Efficiency Toluene Elimination at Low Temperature

Abstract The release of volatile organic compounds (VOCs) such as formaldehyde, benzene, ethylbenzene, and toluene has escalated into a critical issue due to their severe detrimental effects on both the environment and human health. In this study, we employed Co 3 O 4 and CeO 2 as mixed oxide support to fabricate Pt/Co 3 O 4 ‐CeO 2 via the galvanic displacement method (Pt/CC‐GD). Pt/CC‐GD demonstrated the highest efficiency achieving 90% conversion at 169 °C compared to 198 °C for the nanoparticles loading method (Pt/CC‐NPs), 210 °C for the wet impregnation method (Pt/CC‐WI), and 244 °C for the /Co 3 O 4 ‐CeO 2 support (CC). This enhanced performance is attributed to the exceptional oxygen mobility and superior CO 2 desorption capability over Pt/CC‐GD and robust interaction between Pt and the Co 3 O 4 ‐CeO 2 support. Furthermore, Pt/CC‐GD demonstrated excellent catalytic durability maintaining stable activity after calcination at 700 °C for 20 h, while Pt/CC‐NPs and Pt/CC‐WI experienced significant activity decline under the same conditions. These results suggest that galvanic deposition is a promising synthesis technique for enhancing the efficiency of VOC catalytic removal.