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.