, Volume 67, Issue 5, pp 490-496
Date: 19 Jan 2013

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

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The condensation reaction of o-phenylenediamine and arylaldehydes was investigated in the presence of nanosized sulfated zirconia (SO 4 2− -ZrO2) as the solid acid catalyst. Nanosized SO 4 2− -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.