title: Praseodymium incorporated AIPO-5 molecular sieves for aerobic oxidation of ethylbenzene.
abstract: PrAlPO-5 with (Al + P)/Pr ratios of 25, 50, 75 and 100 molecular sieves were successfully synthesized by hydrothermal method. These molecular sieves were characterised using XPS, TPD-NH3, ex-situ pyridine adsorbed IR, TPR, TGA, 27Al and 31P MAS-NMR and ESR studies. The incorporation of praseodymium in the framework of AlPO-5 was confirmed by XRD, DRS UV-vis and 27Al and 31P MAS-NMR analysis. ESR spectrum showed the presence of adsorbed oxygen. The nature and strength of acid sites were identified by ex-situ pyridine adsorbed IR and TPD-NH3. The BET surface area was found to be in the range of 238-272 m2 g(-1). The catalytic activity of the molecular sieves was tested for the liquid phase aerobic oxidation of ethylbenzene. Acetophenone was found to be the major product with more than 90% ethylbenzene conversion. ICP-OES analysis revealed the presence of praseodymium intact in the framework of AlPO-5 up to five cycles.
authors.affiliation: Department of Chemistry, Anna University, Chennai 600025, India.
authors.forename: B
authors.initials: B
authors.lastname: Sundaravel
authors.forename: C M
authors.initials: CM
authors.lastname: Babu
authors.forename: B
authors.initials: B
authors.lastname: Palanisamy
authors.forename: M
authors.initials: M
authors.lastname: Palanichamy
authors.forename: K
authors.initials: K
authors.lastname: Shanthi
authors.forename: V
authors.initials: V
authors.lastname: Murugesan