Abstract: Selective catalytic reduction of NO by CH₄(CH₄-SCR) in the presences of excess oxygen was studied over CoH-FBZ catalysts with FAU and BEA double micro-porous topology structure.The catalysts were characterized with XRD, FT-IR, SEM, DRS-UV-Vis, NH₃-TPD and H₂-TPR techniques.The results showed that uniform morphology was observed over the SEM images of CoH-FBZ.Characteristic peaks attributed to FAU and BEA topology structure were observed over the XRD patterns and the FT-IR spectra of the CoH-FBZ catalysts.New strong acidic sites were formed over H-FBZ and CoH-FBZ based on the NH₃-TPD results.CoH-FBZ exhibited higher CH₄-SCR activity than the physical mixture of CoH-Y and CoH-Beta with comparable relative content of BEA topology structure.Over the physical mixture catalysts of CoH-Y and CoH-Beta, the CH₄-SCR activity decreased with increasing relative content of CoH-Y.In contrast, CoH-FBZ in which the relative content of the FAU to BEA topology structure was (0.4∶0.6)—(0.1∶0.9) exhibited better CH4-SCR catalytic properties.The synergistic effect of the new strong acidic sites promoted the reduction of NO by CH₄.