A series of CuSO4/TiO2 binary oxide catalysts with different CuSO4 loadings (0–20 wt%) were prepared by a facile solid state impregnation protocol.

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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.Selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) is one of the most popular methods to eliminate NO x from stationary sources. [1][2][3] V 2 O 5 -WO 3 /TiO 2 materials with high catalytic activity in temperature range of 300-400°C have been successfully used in coal-fired power plants for decades. However, the activate temperature of commercial V 2 O 5 -WO 3 /TiO 2 catalysts is too high in comparison to effluent temperature of cement factory, steel manufacturing, and other stationary sources. [4,5] As such, the efficient SCR catalysts which own high activity under low temperatures are highly desired. [6][7][8] Up to now, considerable attention has been focused on transition metal oxides such as Mn-, Ce-, Cu-, and Fe-based materials which demonstrate high activity in NH 3 -SCR at low temperatures; however, the low tolerance to SO 2 limits the application of these metal oxide catalysts in industry. [9][10][11][12] As a consequence, the development of low-temperature catalysts with superior NH 3 -SCR activity and high SO 2 tolerance is a hot topic in NH 3 -SCR.Metal-organic frameworks (MOFs) as newly emerging materials are important and potential materials in heterogeneous catalytic reactions due to their large specific surface areas, high structural diversity, tunable chemical properties, and highly dispersed metal sites. [13] MOFs have been used as new SCR catalysts by a few groups and are thought to be potential alternatives for commercial SCR catalysts. [14] Researchers have found that MIL-100(Fe), [13] Mn-MOF-74, [16] Co/Mn-MOF-74, [17] and Cu-MOF-74 [18] could perform higher activity than that of V 2 O 5 -WO 3 /TiO 2 catalysts at low temperatures (< 200°C). However, the synthesis procedure of MOFs is rather complicated with high energy consumption and the low-temperature SCR activity of MOFs still needs to be improved.A promising approach to enhance the catalytic performance of MOFs is to fabricate the MOFs into core-shell architecture. Recently, metal oxides@MOFs core-shell materials have been used in various c...