Prepartion And Characterization Of MOF Materials And Their NH₃-SCR Catalytic Properties

As nitrogen oxides(NO_x)have a significant direct impact on human health and ecology environment,which is one of the root causes of such pollutions as photochemical smog and acid rain.Much attention has been devoted to elimination of nitrogen oxides and in denitrification field has been devoted for a new type of catalyst for SCR reaction at relatively low-temperature.Metal-organic frameworks(MOFs),which emerging as an advance multifunctional materials,has recently been booming in NO absorption research,but its catalytic applications in SCR field has just started.Based on that MOFs has not only controllable it with excellent catalytic activity,this study is aimed at developing a novel heteronuclear MOFs with good low-temperature SCR catalytic properties.This study intends to synthesis heteronuclear MOFs through self-assembly method,by choosing the appropriate metal ions with nitrogen-containing organic acid.In this dissertation,we preparated several series of MOFs,the structures and properties of synthesized materials were charactered,and the influences of different synthesis conditions on their denitrification activity were investigated in detail.Through the results,we compared the differences among the MOFs materials for low-temperature activity.And made several series of supported MOFs,then discuss the supported metal complexes’ influence on catalytic activity.At last,we analyzed the reaction mechanism of MOFs catalytic conversion.This study will provide experimental and theoretical framework for the development of novel MOFs-based efficient low-temperature catalytic materials for SCR.Based on the above contents,the research results show as follow.1.Among the MOFs material,HKUST-1 exhibited the highest catalytic activity of low-temperature NO conversion,and the other MOFs don’t have obvious performance at low temperature.2.Compare the activity of supported MOFs,Cu and Fe improve the catalytic activity.MOF-5 material with MnOx loaded also exhibited high catalytic activity.The other supported metals have no activity improvement.3.Compare the MOFs materials with molecular slave and compound oxides,we find the MOFs has lower catalytic activity and stability.The reason is MOFs has organic frameworks,which block the electron transfer between metallic oxide on vertex and decrease catalytic activity.