Phenol hydroxylation over copper modified ZSM-5 catalysts
DOI:
https://doi.org/10.17533/udea.redin.344304Keywords:
hydroxylation, phenol, catechol, hydroquinone, CuZSM-5Abstract
Several CuZSM-5 catalysts were prepared by hydrothermal synthesis from gels containing different Si/Al and Si/Cu ratios; methylamine or sodium hydroxide were used as mineralizing agents. Catalysts were characterized by DRX, IR, BET, UVVIS and chemical analysis. Catalysts activity were evaluated in the hydroxylation of phenol with H2O2. The catechol (CAT)/(hydroquinone (HQ) + p-benzoquinone (PBQ)) ratio increased either by increasing H2O content and reaction temperature, lowering catalyst amount, or decreasing catalyst Si/Al ratio. The production of p-benzoquinone (PBQ), resulting from hydroquinone oxidation, was minimized when reaction conditions were: 80 ºC, phenol: 1 mmol, phenol/H2O2 molar ratio: 3/1, catalyst: 20 mg, and water: 5 g, reaction time: 4 h.
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