Effect of acidic and red-ox sites over modified ZSM-5 surface on selectivity in oxidation of toluene

The modified HZSM-5 zeolites via alkali-treated and supported iron oxide exhibited high selectivity to benzaldehyde via promoting the oxidation of toluene or benzyl alcohol and limiting the further oxidation of benzaldehyde into phenol caused by lowing surface acidity and introducing Fe red-ox site.