Phenol oxidation with hydrogen peroxide using Cu/ZSM5 and Cu/Y5 catalysts

Abstract

In this work, catalytic activity and stability of Cu/Y5 and Cu/ZSM5 zeolites in phenol oxidation with hydrogen peroxide were examined. The catalyst samples were prepared by the ion exchange method of the protonic form of commercial zeolites. The catalysts were characterized by the powder X-ray diffraction (XRD), AAS, while the adsorption techniques were used to measure the specific surface area. The thermal programmed desorption of NH3 (NH3-TPD) was used for measuring the total number of acid sites formed on the surface of zeolites. Catalytic performance of the prepared samples was monitored in terms of phenol, hydrogen peroxide and total organic carbon (TOC) conversion, by-product distribution and a degree of copper leached into the aqueous solution.It was found that the activity of Cu/Y5 catalyst was generally higher than that of Cu/ZSM5 and that unlike Cu/ ZSM5, Cu/Y5 catalyzed phenol oxidation more completely.

Fe-Natural Zeolite as Highly Active Heterogeneous Catalyst in Decolorization of Reactive Blue 4

“…Increasing pH value from 2-3 favoured the decolorization of RB4 while the higher pH value (pH >3) decreased the catalytic activity. The maximum decolorization efficiency of RB4 was achieved at pH 2.5 with 98% decolorization efficiency due to enhance formation of highly reactive OH • radical at an acidic condition due to the presence of photons [27]. Similar results were also reported by other researchers in heterogeneous Fenton-like reaction [12], [13].…”

Preparation of ZrO2/Al2O3-montmorillonite composite as catalyst for phenol hydroxylation

“…The earlier analysis of the effect of surface acidity on the radical mechanism indicated that the lower total acidity and L/B on the surface might be the main factors affecting the reaction rate. The adsorption–desorption mechanism is an important step in heterogeneous catalysis and is influenced by the intrinsic acidity of the solid catalyst [25–28] . In contrast, 20Zr has a higher total acidity, and L/B has a lower reaction rate.…”

Performance of activated carbons in the catalytic wet peroxide oxidation (CWPO) of maleic acid

“…Rubalcaba et al (2007) reported that, adding H 2 O 2 to the CWAO process not only increases pollutant removal but also leads to higher mineralisation of the remaining oxidation products. This is because hydrogen peroxide acts as a free radical initiator, providing hydroxyl radicals that increase pollutant removal (Valkaj, 2011). was studied at 0.01 mol/L of maleic acid, 50°C and 0.5 g/l of activated carbons.…”