Ordered mesoporous silica-based materials with very high content of substituted heteroatoms from a Ph-adjustor of urea

摘要

A simple and effective method is used to introduce a large amount of heteroatoms into mesoporous walls of SBA-15 such as Si/Al ratio at near 1.0. This method is based on slow hydrolyzation of urea at the temperature of ～90 ℃, which makes pH value of the solution change gradually. The results of XRD, N_2 isothermals, TEM, SEM, NMR and element analysis indicate that all the samples have highly ordered mesostructures with very high content of substituted heteroatoms.