Journal of Colloid and Interface Science, Vol.511, 92-100, 2018
A new microporous oxyfluorinated titanium(IV) phosphate as an efficient heterogeneous catalyst for the selective oxidation of cyclohexanone
Designing a new porous nanomaterial for eco-friendly catalytic reactions is very challenging. Here, a new crystalline microporous oxyfluorinated titanium phosphate material (TIPO-1) has been synthesized under hydrothermal conditions in the absence of any structure directing agent. The triclinic crystalline phase with the unit cell parameters alpha = 7.962 angstrom, b = 10.006 angstrom, c = 13.979 angstrom, alpha = 96.921 degrees, beta = 95.851 and gamma = 93.760 degrees has been indexed for TIPO-1 and it has been characterized through powder X-ray diffraction, nitrogen adsorption/desorption, XPS, FT-IR, P-31 MAS NMR spectroscopy, UHR-TEM, FE-SEM and TGA/DTA analysis. The material exhibited excellent catalytic activity in liquid phase partial oxidation of cyclohexanone to adipic acid (up to 92% conversion) in the presence of aqueous H2O2 as oxidant together with value added side products like 1,6-hexandial and epsilon-caprolactone for reactions in different solvents. The material showed excellent recycling efficiency for six consecutive reaction cycles without any significant loss in catalytic activity. (C) 2017 Elsevier Inc. All rights reserved.
Keywords:Titanium phosphate;Microporosity;Triclinic phase;Liquid phase selective oxidation;Adipic acid synthesis