高效氧化铜-二氧化铈催化剂的研究进展

The recent developments and applications of efficient copper-ceria catalysts

二氧化铈(CeO_(2))因其独特的储存和释放氧的能力,通过调控晶畴尺寸和表面结构,可与活性组分形成结构稳定且化学性质活泼的界面相互作用,显著提高催化剂的性能,从而被广泛应用.对于活性组分的选择,氧化铜因其价廉易得、活性和稳定性良好等特点成为贵金属的优良替代品.因此,氧化铜-二氧化铈(CuO-CeO_(2))复合材料成为当下催化多种工业反应如一氧化碳氧化、水煤气变换反应等经济有效的催化剂.然而,由于CeO_(2)的形貌、尺寸以及暴露晶面等都会对金属载体间的相互作用产生影响,导致催化剂的结构十分复杂,造成了对活性位点及其作用机理的认知不充分.本文总结了本课题组对CuO-CeO_(2)体系中的活性位点进行精确指认的策略,以及以此为基础对活性位点的调控,探讨了新的反应机理,并对其未来发展方向进行了展望.

Because of its unique ability in storing and releasing oxygen,ceria(CeO_(2))can form structurally stable and chemically active interface with the active components by adjusting the crystal domain size and surface structure,which significantly improves the performance of the catalyst.For the selection of active components,copper has become an excellent substitute for noble metals because of its availability,good activity,and decent stability.Therefore,the copperceria catalytic system has become the most economical and effective material for catalyzing a variety of industrial reactions such as carbon monoxide oxidation and the water gas shift reaction.The morphology,size,and exposed crystal faces of CeO_(2)will affect the interaction between the metal and supports to form complex structure of the catalyst,resulting in insufficient understanding of the active site and mechanism.Therefore,this paper briefly summarized the precise identification and rational construction of active sites in the CuO-CeO_(2)system.Besides,the prospects for its future development direction are mentioned briefly.