Ag/Cu_3(BTC)_2复合催化剂的制备及其NH_3-SCR催化性能

Synthesis of Ag/Cu_3(BTC)_2 composite catalysts and their catalytic performance for NH_3-SCR

采用紫外还原的方法成功制备出Cu_3(BTC)_2(均苯三甲酸合铜)负载贵金属Ag纳米颗粒的Ag/Cu_3(BTC)_2复合催化剂,并用于氨法脱硝反应.应用X射线衍射(XRD)、透射电子显微镜(TEM)、BET测试等手段对催化剂的物理化学性能进行了表征.结果发现Ag纳米颗粒以球状结构高度均匀分散在Cu_3(BTC)_2骨架结构的表面.负载Ag纳米颗粒和Cu-MOF的协同作用,提高了Ag/Cu_3(BTC)_2催化剂的脱硝效率,负载量为15wt%的催化剂表现出最优脱硝效率,在220~260℃达到100%的NO转化率.同时,利用in-situ FTIR技术对NH_3-SCR的反应机理进行了探究.

Cu3(BTC)2 catalyst loaded with Ag nanoparticles was successfully prepared through UV reduction method,and was applied for NH3-SCR reaction.The physicochemical properties of Ag/Cu3(BTC)2 catalyst were characterized by XRD,TEM and BET.It was found that Ag nanoparticles showed a pherical structure and were highly dispersed on the skeleton structure surface of Cu3(BTC)2.The synergistic effect between Ag nanoparticles and Cu-MOF could significantly improve the denitrification efficiency of Ag/Cu3(BTC)2 catalyst.The Ag/Cu3(BTC)2 catalyst with 15wt%addition achieved a 100%NO conversion rate in temperatures range from 200 to 260℃.Furthermore,the reaction mechanism was proposed on basis of the results of in situ Fourier transform infrared spectroscopy.