Abstract: A series of Cu_(x)Co_(y)Ce_(z)-LDH precursors were synthesized by one-step hydrothermal method, and Cu_(x)Co_(y)Ce_(z)O mixed metal oxide catalysts were prepared after calcination and used to study the selective catalytic reduction of NO by C₃H₆ (C₃H₆-SCR) with a fixed bed micro-reactor. Due to the strong synergy between Cu, Co and Ce, Cu_(0.21)Co_(0.48)Ce_(0.31)O achieves 95% NO conversion and 90% N₂ selectivity at 225 ℃. In addition, ICP, XRD, TEM, XPS, H₂-TPR were used to characterize the basic physical-chemical properties of the catalysts to investigate the relationship between physicochemical properties and catalytic reduction abilities. XRD results show that solid solutions are formed between Cu, Co and Ce, which promotes the dispersion of active metals. XPS and H₂-TPR further demonstrate that redox reactions occur between Cu and Co, promoting the formation of oxygen vacancies, thereby improving their catalytic reduction capacity.