Hexagonally ordered mesoporous phosphates oxynitrides

Work on the synthesis, characterization and structure change of the ordered mesoporous phosphates oxynitrides materials is described. Ordered mesoporous phosphates oxynitrides materials, characterized by high surface area, narrow pore-size distribution and good order, were synthesized through treating amorphous phosphates mesoporous molecular sieves at high temperatures in flowing ammonia. Adjusting the nitridation time and temperature can easily control the nitrogen contents of the oxynitride materials. The different amine groups are confirmed to exist on the mesopore surfaces of the obtained ordered mesoporous phosphates oxynitrides. At the same time, an apparent kinetics equation was built to fit the nitrogen content data of ordered mesoporous phosphates oxynitrides and the nitridation process accords with first-order reaction kinetics equation. 27Al and 31P MAS NMR and in situ FT-IR confirmed that nitrogen was incorporated into the phosphate framework. TEM, powder XRD and N2 sorption evidenced the good structural ordering of the mesoporous phosphate oxynitrides materials.