Textural properties of alpha-titanium(IV) phenylphosphonate: Influence of preparation conditions

Layered alpha-titanium(IV) phenylphosphonate can be prepared with a broad v ariation in surface area and porosity. Several sources for tetravalent tita nium ion and different synthetic procedures have been studied. The solids w ere characterized by powder X-ray diffraction (XRD), thermogravimetric (TG) analysis, IR and P-31 magic angle spinning (MAS) NMR spectroscopies, N-2 a dsorption-desorption isotherms, and scanning electron microscopy (SEM). The materials obtained have a high thermal stability as shown by TG analysis, N-2 adsorption-desorption isotherms of the solids correspond to type IV of the BDDT classification and show hysteresis loops of type H-3, characterist ic of solids with slit-shaped pores. The materials are essentially mesoporo us, and any mensurable microporosity was not detected. BET surface areas, p orosity, and crystallinity are markedly dependent on the preparation proced ure. (C) 1999 Elsevier Science Ltd.