Mesoporous Cerium-containing Silica Tube Sphere Nanocrystalline Molecular Sieves Synthesis and Characterization

摘要

The Ce-MCM-41 material have been characterized by powder X-ray diffraction (XRD). Fourier transform infrared spectroscopy ( FTIR ) Raman spectroscopy. ~(29)Si magic-angle-spinning nuclear magnetic resonance (MA S NMR ), and transmission Electron Microscopy (TEM). XRD show that the as-synthesized CeMCM-41 materials have the MCM-41 structure and contain only atomically dispersed Ce (Ⅲ). FTIR. Raman reveal that Ce (Ⅳ) monocerium exists in calcined Ce MCM-41, ~(29)Si MAS NMR and N_2 ad sorption show that part of the cerium is incorporated in to the MCM-41, structure.