Journal of Porous Materials

, Volume 20, Issue 1, pp 257–266 | Cite as

Metal complexes of 2-methylimidazole encapsulated in zeolite-Y as efficient and reusable catalysts for oxidation of phenol and benzyl alcohol

  • Kondahalli Narasaiah Bhagya
  • Virupaiah Gayathri
Article
First Online:

Abstract

Copper(II), ruthenium(III) and zinc(II) complexes of 2-methylimidazole (2-MeImzlH) encapsulated in the supercages of zeolite-Y have been synthesized and characterized by various physicochemical measurements. The catalytic potential of these complexes were tested for the oxidation of phenol and benzyl alcohol using 30 % H2O2 as an oxidant. Various parameters, such as concentration of oxidant and catalyst, reaction time, temperature of the reaction, volume of solvent and type of solvents have been optimized to obtain the maximum transformation of phenol to catechol and hydroquinone. The catalytic activity of zeolite encapsulated complexes followed the order: [Cu(2-MeImzlH)]-Y (72.5 %) > [Ru(2-MeImzlH)]-Y (57.8 %) > [Zn(2-MeImzlH)]-Y (43.2 %) after 5 h of reaction time. Oxidation of benzyl alcohol catalyzed by these encapsulated complexes gave only benzaldehyde as the product. The zeolite-encapsulated complexes could be easily separated after the reaction and reused. The neat complexes gave low conversions as compared to the encapsulated catalysts and decomposed. The catalytic activity of zeolite encapsulated complexes was found to be better than their respective non-encapsulated complexes and metal exchanged zeolites.

Keywords

Zeolite-Y encapsulated metal complexes Hydrogen peroxide decomposition Oxidation of phenol Oxidation of benzyl alcohol 
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Notes

Acknowledgments

The authors wish to thank University Grants Commission, CESEM award project under vision group on Science and Technology, Government of Karnataka, India and SAIF, Kochi, for TGA and CHN analysis.

Supplementary material

10934_2012_9595_MOESM1_ESM.doc (394 kb)
Supplementary material 1 (DOC 394 kb)

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Kondahalli Narasaiah Bhagya
    • 1
  • Virupaiah Gayathri
    • 1
  1. 1.Department of Chemistry, Central College CampusBangalore UniversityBangaloreIndia

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