Defect-engineered Cu O/CeO2 catalysts: Enhanced low-temperature CO preferential oxidation through dual-promotion of CO adsorption and O2 activation

作者：Changjin Xu, Jiuyang Wang, Desheng Wang, Houbao Qi, Laibing Wang, Riqing Cheng, Na Ta, Jiahao Shi, Wenyao Zhang, Jianping Chen, Junfang Ding, Huiqing Guo · 发表于：Molecular Catalysis · 年份：2025 · DOI：10.1016/j.mcat.2025.115148 · 被引用次数：4 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Catalysts for Methane Reforming

The preferential oxidation of CO (CO-PROX) represents a critical strategy for trace CO elimination in hydrogen purification, where CO adsorption and O 2 activation are crucial for enhancing catalytic performance. Herein, we report a defect-engineered strategy mediated by MOF to promote CO adsorption and O 2 activation. By pyrolyzing Ce-BDC MOF , we synthesized CeO 2 –O support with a high–density mesoporous structure and high surface area, facilitating the well-dispersion of Cu ₓ O species and forming abundant interfacial Cu + active sites. The well-dispersed Cu x O species enhance their interaction with CeO 2 –O, resulting in weakened Ce–O bonds and promoting both lattice oxygen activation and oxygen vacancy (Vo) formation for enhanced O 2 activation. The optimized 15Cu x O/CeO 2 –O catalyst demonstrates exceptional catalytic efficiency, achieving complete CO conversion at a comparatively low temperature (T 100 % = 115 °C), coupled with broad temperature window applicability and outstanding stability over multiple cycles. This work establishes a MOF-guided paradigm for engineering multifunctional catalytic sites, offering a generalizable approach to design high-performance oxide catalysts for hydrogen purification and beyond.