Fourier transform Raman spectroscopy of novel aluminophosphate molecular sieves

New generation, small-, medium-, and Large-pore metal-incorporated aluminop hosphate (MeAPO) molecular sieves were investigated with the use of Fourier transform (FT) Raman spectroscopy. The Raman spectra of well-characterized , high-purity MeAPO molecular sieves such as AlPO-5, NiAPO-5, MAPO-11, SAPO -34, MAPO-36, MAPO-39, MAPO-43, SAPO-44, MAPO-46, and MAPO-50 have been obt ained in the 150-3250 cm(-1) region. The presence of different metals in th e AlPO framework within a particular structure has also been studied by FT- Raman spectroscopy. Comparison of FT-Raman and Fourier transform infrared ( FT-IR) spectra of the samples indicated that the structures of the MeAPOs : Ire more easily distinguished by FT-Raman than by FT-IR spectroscopy and th at the former can be used for identifying and characterizing these material s.