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Hydroxylation of phenol over molybdovanadophosphoric acid modified zirconia

Authors
Journal
Journal of Molecular Catalysis A Chemical
1381-1169
Publisher
Elsevier
Publication Date
Volume
279
Issue
1
Identifiers
DOI: 10.1016/j.molcata.2007.10.005
Keywords
  • Molybdovanadophosphoric Acid
  • Phenol Hydroxylation
  • Hydroquinone
  • Catechol

Abstract

Abstract Molybdovanadophosphoric acid (MVPA) supported zirconia was synthesized by an incipient wetness impregnation method taking zirconium hydroxide and MVPA as the precursors. The neat and supported catalysts were calcined at 500 °C and characterized by nitrogen adsorption–desorption, X-ray powder diffraction, FTIR, UV–vis DRS, temperature programmed reduction (TPR) and Raman spectroscopy techniques. The 15 wt.% MVPA stabilizes the tetragonal phase of zirconia, which leads to an increase in surface area. The Keggin structure of MVPA remains unaltered up to 500 °C. The catalytic activities were evaluated for hydroxylation of phenol using H 2O 2 as the oxidant. Among all the promoted catalysts, 15 wt.% molybdovanadophosphoric acid supported zirconia exhibits highest catalytic activity in phenol hydroxylation, giving 49% conversion having 61% para selectivity.

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