Journal of Porous Materials

, Volume 18, Issue 3, pp 389–397

Zeolite-encapsulated 2-(o-aminophenyl)benzimidazole complexes: synthesis, characterization and catalytic activity

  • B. P. Nethravathi
  • K. N. Mahendra
  • K. Rama Krishna Reddy
Article

DOI: 10.1007/s10934-010-9389-x

Cite this article as:
Nethravathi, B.P., Mahendra, K.N. & Reddy, K.R.K. J Porous Mater (2011) 18: 389. doi:10.1007/s10934-010-9389-x

Abstract

Cobalt(II), copper(II) and zinc(II) complexes of 2-(o-aminophenyl)benzimidazole (AmPhBzlH) encapsulated in the super cages of zeolite-Y and ZSM-5 have been synthesized and characterized by spectroscopic studies (IR, UV/visible, EPR), elemental analyses, thermal studies and X-ray diffraction patterns. The catalytic activity of encapsulated complexes was investigated for the hydroxylation of phenol using 30% H2O2 as an oxidant. Under optimized reaction conditions, the hydroxylation of phenol yielded catechol and hydroquinone as the major products. All catalysts show good selectivity for diphenol products. A maximum conversion of phenol was obtained with [Cu(AmPhBzlH)]-Y as the catalyst. The results showed that conversion of phenol varies in the order [Cu(AmPhBzlH)]-Y > [Cu(AmPhBzlH)]-ZSM-5 > [Zn(AmPhBzlH)]-Y > [Co(AmPhBzlH)]-Y > [Zn(AmPhBzlH)]-ZSM-5 > [Co(AmPhBzlH)]-ZSM-5 after 6 h of reaction time. Test for the recyclability of the reaction was also carried out and the results indicate their recyclability.

Keywords

EncapsulationZeolite-YZSM-5Hydrogen peroxide decompositionOxidation of phenolCatechol and hydroquinone formation

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • B. P. Nethravathi
    • 1
  • K. N. Mahendra
    • 1
  • K. Rama Krishna Reddy
    • 1
  1. 1.Department of Studies in Chemistry, Central College CampusBangalore UniversityBangaloreIndia