Study Of The Elimination Of Nitrogen Oxide By Mesoporous Material

The mesoporpous molecular sieve SBA-15 has been received much attention in fields of catalytic chemistry and asorption-separation,due to the asvantages of high surface area, ordered and tunable pore stucture, high thermal and hydwthermal stability and facile modification of surface properties.In this thesis,M/SBA-15 and M-Al/SBA-15(M=Cu,Cr,Fe) have been prepared by incipient wetness impregnation method.The performance of these samples in deNOx reaction with CO or C3H6 as reducing agent has been investigated by using a fixed bed reactor. XRD, BET, TEM,XPS,FT-IR,27Al MAS NMR are uesd to characterize these sample.The results show that the hexagonal p6mm mesostructure of parent siliceous SBA-15 is maintained very well in M/SBA-15(M=Cu,Cr, Fe) and M-Al/SBA-15(Cu,Cr,Fe),BET surface area and the averge pore diameter decreased and the surfacial elements of the catalysts existed in the form of ion.The catalytic activity of the catalysts depended on the loading of M(Cu,Cr, Fe).In NO+CO reaction,M-Al/SBA-15(Cu,Cr,Fe) are much better than M/SBA-15(M=Cu,Cr, Fe),and series of Cr catalyst and better performance than series of Cu and series of Fe.