Co修饰CeO2复合材料的晶面调控及其光热催化脱硝性能

Facet control of Co-modified CeO2 composite and its thermal-photocatalytic denitration property

采用一步水热法,通过调节Co与Ce的摩尔比,制备出暴露高活性晶面的Co修饰CeO2复合材料。利用比表面和孔径分析仪、TG-DSC、TEM、SEM、XRD、紫外-可见分光光度计(UV-vis)、XPS、光热催化脱硝技术对Co修饰CeO2复合材料进行全面表征。结果表明,随着Co元素含量的增加,Co修饰CeO2复合材料的比表面积增大,CeO2呈纳米棒状结构,Co与表面氧生成Co3O4,二者的共结晶过程降低了复合材料的结晶表面能,使CeO2主要暴露(200)和(220)高活性晶面,且暴露比例增大。光热催化脱硝结果表明,当Co与Ce摩尔比为15%、煅烧温度为400℃时,Co修饰CeO2复合材料的光热催化效率达到最高,为98%。

The Co-modified CeO2 composites with high active crystal planes were synthesized by simple one step hydrothermal method. The structure of Co-modified CeO2 composites was characterized by specific surface area and porosity analyzer, TG-DSC, TEM, SEM, XRD, ultraviolet-visible spectrophotometer(UV-vis), XPS and photothermal catalytic denitration. The results show that as the amount of Co increases, the specific surface area of the Co-modified CeO2 composites increases. The exposed high active surface is(200) and(220) crystal face, while the Co-modified CeO2 composites mainly show rod-like structure;when the concentration of Co content precursor increases, CeO2 has a nanorod structure, and the Co produces in the form of Co3O4 by chemical band connection with surface oxygen. The results of thermal-photocatalytic denitration test show that the catalytic efficiency of the Comodified CeO2 composites reaches 98% with 15% molar ratio of Co to Ce at 400℃ calcination temperature.