Effect of ions in electrolyte solution on the oxidation reaction of toluene to benzaldehyde over AL-TS-1 catalyst

Abstract

This research studies effect of ions in electrolyte solution on the oxidation reaction between toluene and hydrogen peroxide to benzaldehyde over titanium silicalite-1 catalyst modified with metallic aluminum (Al-TS-1). The catalyst is prepared by hydrothermal method and characterized by XRD, FT-IR, XRF and BET. The reaction is carried out at reaction temperatures 110˚C and 120℃ in a pressurized autoclave reactor. Hydrochloric acid, nitric acid, ammonium chloride, ammonium nitrate, sodium chloride or sodium nitrate is added into the aqueous phase which the concentration of solution is 0.1 M. The catalytic activity testing found that the addition of electrolyte solution not only increases the concentration of toluene in the aqueous phase but also increases the formation of benzaldehyde as main product in the reaction. The conversion of hydrogen peroxide in the reaction which has the presence of ions in the aqueous phase is higher than the reaction in the neutral aqueous phase. In addition, the conversion of hydrogen peroxide is also increases with the increasing of reaction temperature.