In situ Growth Synthesis of CuO@Cu-MOFs Core-shell Materials as Novel Low-temperature NH ₃ -SCR Catalysts

Metal oxides@MOFs core-shell materials were developed for selective catalytic reduction of NO _x by NH ₃ (NH ₃ -SCR). A novel CuO@Cu-MOFs core-shell material with CuO as the core and Cu ₃ (BTC) ₂ as the shell were rationally designed and synthesized by an in situ growth method and used in NH ₃ -SCR reaction. The prepared CuO@Cu-MOFs materials combined physicochemical properties of CuO (high NO adsorption stability and excellent surface reducibility) and Cu ₃ (BTC) ₂ (large specific surface area and abundant acid sites). In addition, the core-shell materials held large amounts of Brønsted acid sites and abundant adsorbed NO _x intermediate species, which benefited NH ₃ -SCR reaction under low-temperature. Experimental results demonstrated that CuO@Cu-MOFs possessed higher low-temperature catalytic activity than that of pure CuO and Cu ₃ (BTC) ₂ . Importantly, CuO@Cu-MOFs performed satisfied stability in NH ₃ -SCR reaction, which made it to be a potential and promising low-temperature SCR catalyst.