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A new microporous oxyfluorinated titanium(IV) phosphate as an efficient heterogeneous catalyst for the selective oxidation of cyclohexanone

Bhanja, Piyali, Chatterjee, Sauvik, Patra, Astam K., Bhaumik, Asim
Journal of colloid and interface science 2018 v.511 pp. 92-100
Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, adipic acid, adsorption, catalysts, catalytic activity, cyclohexanones, desorption, differential thermal analysis, hydrogen peroxide, liquids, nanomaterials, nitrogen, nuclear magnetic resonance spectroscopy, oxidants, oxidation, phosphates, phosphorus, porous media, scanning electron microscopy, solvents, stable isotopes, thermogravimetry, titanium, value added
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 a=7.962Å, b=10.006Å, c=13.979Å, α=96.921°, β=95.851° and γ=93.760° has been indexed for TIPO-1 and it has been characterized through powder X-ray diffraction, nitrogen adsorption/desorption, XPS, FT-IR, ³¹P 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 ε-caprolactone for reactions in different solvents. The material showed excellent recycling efficiency for six consecutive reaction cycles without any significant loss in catalytic activity.