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Title: Synthesis, characterization and catalytic activity of SnAPO-5 in hydrogenation reaction
Authors: Sasidharan, Manickam
Bhaumik, Asim
Keywords: Catalysis;Aluminophosphates;Tin;Molecular sieves;Metallophosphates;Hydrogenation;Cyclohexanone
Issue Date: Feb-2011
Publisher: NISCAIR-CSIR, India
Abstract: Tin containing aluminophosphate molecular sieve with AFI structure (SnAPO-5) has been synthesized hydrothermally by using Sn(II) and Sn(IV) salts as precursors. The SnAPO-5 materials have been thoroughly characterized by powder X-ray diffraction, FTIR, UV-vis spectroscopy, scanning electron microscopy, thermal analysis, N2 sorption and surface area measurements, and elemental analysis using ICP. FTIR and UV-vis spectral data of calcined SnAPO-5 reveal that Sn can be substituted for the phosphorous sites up to 2 mole% in the framework lattices. Substitution of Sn preferably occurs at the phosphorous sites rather than for Al at lower metal concentration [Sn(II) or Sn(IV) ≤ 2 mole% SnO2] but higher loading leads to octahedral tin species. The calcined SnAPO-5 material exhibits good hydrogenation activity for the reduction of cyclohexanone to cyclohexanol using 2-butanol as hydrogen donor molecule under the liquid-phase reaction conditions. Other metallophosphates such as CoAPO-5, MnAPO-5 and FeAPO-5 fail to undergo this hydrogenation reaction under similar experimental conditions.
Page(s): 149-155
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.50A(02) [February 2011]

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