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Nanosized sulfated zirconia as solid acid catalyst for the synthesis of 2-substituted benzimidazoles

1Department of Chemistry, Yazd University, 89195-741, Yazd, Iran

2Department of Chemistry, Payame Noor University, P.O. BOX 19395-3697, Tehran, Iran

Citation Information: Chemical Papers. Volume 67, Issue 5, Pages 490–496, ISSN (Online) 1336-9075, DOI: 10.2478/s11696-013-0311-2, February 2013

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The condensation reaction of o-phenylenediamine and arylaldehydes was investigated in the presence of nanosized sulfated zirconia (SO42−-ZrO2) as the solid acid catalyst. Nanosized SO42−-ZrO2 was prepared and characterized by the XRD, FT-IR, and SEM techniques. The results confirm good stabilization of the tetragonal phase of zirconia in the presence of sulfate. Reusability experiments showed partial deactivation of the catalyst after each run; good reusability can be achieved after calcinations of the recovered catalyst before its reuse.

Keywords: sulfated zirconia; nanoparticle; solid acid; catalyst; benzimidazole; reusability

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