Synthesis, characterization and catalytic activity of SnAPO-5 in hydrogenation reaction

摘要

Tin containingaluminophosphate molecular sieve with AFI structure (SnAPO-5) has been synthesizedhydrothermally by using Sn(II) and Sn(IV) salts as precursors. The SnAPO-5materials have been thoroughly characterized by powder X-ray diffraction, FTIR,UV-vis spectroscopy, scanning electron microscopy, thermal analysis, N2sorption and surface area measurements, and elemental analysis using ICP. FTIRand UV-vis spectral data of calcined SnAPO-5 reveal that Sn can be substitutedfor the phosphorous sites up to 2 mole% in the framework lattices. Substitutionof Sn preferably occurs at the phosphorous sites rather than for Al at lowermetal concentration [Sn(II) or Sn(IV) ≤ 2 mole% SnO2] but higherloading leads to octahedral tin species. The calcined SnAPO-5 material exhibitsgood hydrogenation activity for the reduction of cyclohexanone to cyclohexanolusing 2-butanol as hydrogen donor molecule under the liquid-phase reactionconditions. Other metallophosphates such as CoAPO-5, MnAPO-5 and FeAPO-5 failto undergo this hydrogenation reaction under similar experimental conditions.