• Mesoporous titanium phosphates and related molecular sieves: Synthesis, characterization and applications

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/114/04/0451-0460

    • Keywords

       

      Titanium phosphate; zeolite; ion-exchanger; cationic framework; oxidation catalysis; photocatalysis

    • Abstract

       

      Titanium (IV) phosphates TCM-7 and -8 with mesoporous cationic framework topologies using both cationic and anionic surfactants have been synthesized. Experimental data suggest the stabilization of the tetrahedral state of Ti in TCM-7/8 (O-P-O-Ti-O-, at Ti/P = 1:1)vis-à-vis the most stable octahedral state of Ti in the rutile/anatase or pure mesoporous TiO2. Mesoporous TCM-7 and-8 show anion exchange capacity due to the framework phosphonium cation and cation exchange capacity due to defective P-OH groups. Grafting the organic functionality in the surface or bridging the organic moiety in between the inorganic phosphorus precursors can enhance hydrophobicity of these materials similar to that of mesoporous silica materials. The high catalytic activity in the liquid phase partial oxidation of cyclohexene over such organically surface modified mesoporous titanium phosphate using a dilute H2O2 oxidant supports the tetrahedral coordination of Ti in these materials. These materials also show excellent photocatalytic activity in the production of H2 by photo-reduction of water under UV light irradiation.

    • Author Affiliations

       

      Asim Bhaumik1

      1. Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700 032, India
    • Dates

       
  • Journal of Chemical Sciences | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.