Teresa Granato

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

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

Cu-MOF: a new highly active catalyst for WHPCO of waste water from agro-food production

The catalytic activity of copper-based metal organic framework compound (Cu-MOF) in the wet hydrogen peroxide catalytic oxidation (WHPCO), using p-coumaric acid as model phenolic compound, have been studied and compared with that of a copper-based pillared clays (Cu-PILC). Cu-MOF shows a high activity, but a structural and morphological change is observed during the reaction, even if the activity of the reused catalyst is higher in consecutive cycles with respect to that of the fresh sample.

Zeolite based ceramics as catalysts for wet hydrogen peroxide catalytic oxidation of phenol and poly-phenols

In the present work, a Cu-13X zeolite sample was ceramized and used as a catalyst for the wet oxidation of phenol solutions and olive oil mill wastewaters (OOMW). The material showed good catalytic activity for the abatement of phenol and poly-phenols, excellent stability and no leaching of the active species. In this way a real heterogeneously catalyzed reaction was performed. Moreover, the catalyst was reused without special reactivation treatments for different consecutive reaction cycles.