介孔氮化碳负载氧化钒催化苯甲醇选择氧化反应

摘要

Mesoporous graphitic carbon nitride (CND)was prepared and used as a catalytic support to load vanadia.The obtained V/CND materials were characterized by several characterization techniques including N2 adsorption-desorption,SAXS,TEM,XPS,Raman,FT-IR,and XPS spectroscopy.In the selective ox-idation reactions of benzyl alcohol,the V/CND showed high catalytic performances and good recyclability, especially superior selectivities (> 84%)to the values obtained over other vanadia catalysts supported on traditional materials (SBA-1 5 ,carbon nanotubes,and active carbon).As revealed by FT-IR and XPS re-sults,the active sites were attributed to the dispersed vanadia species.More importantly,the basic chemi-cal environment of the CND support was regarded to effectively restrain the deep oxidation of benzalde-hyde.%制备一系列介孔石墨相氮化碳负载氧化钒催化剂(V/CND)。通过 N2吸-脱附、小角 X 射线散射、透射电镜、X射线衍射、拉曼光谱、傅里叶红外光谱、X射线光电子能谱等表征手段对 V/CND材料的结构、形貌等理化性质进行表征。在苯甲醇选择氧化反应中,V/CND催化剂表现出较高的催化活性及良好的循环使用性。与传统载体材料(SBA-15、碳纳米管和活性炭)相比,V/CND催化剂具有更高的选择性(>84%)。测试结果表明催化剂活性中心是分散的氧化钒物种。CND材料作为一种碱性载体可以有效地抑制苯甲醛的深度氧化。