Naslov
Catalytic Wet Peroxide Oxidation of Phenol over Different Prepared Cu/ZSM-5 Catalysts

Autori
Maduna Valkaj, Karolina ; Katović, Andrea ; Zrnčević, Stanka

Izvornik
Journal of Hazardous Materials (0304-3894) 144 (2007), 3; 663-667

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Phenol; Catalytic oxidation; Hydrogen peroxide; Cu/ZSM-5;

Sažetak
Phenol and phenol compounds are common and important pollutants found in the effluent streams of variety of chemical plants, including coal processing plants and refineries. In the conventional catalytic wet air oxidation (CWAO) of phenol reaction is performed at high operating pressure (1-10 MPa) and temperature (353-475 K), makes the investment rather costly. By contrast, hydrogen peroxide as an oxidant (a CWPO process) allows oxidation under or almost under the ambient conditions (atmospheric pressure and TŁ323 K), which reduces the investment. A great variety of solid catalysts, including active carbon, supported and unsupported metal oxides, and metals supported on metal oxides, graphite, clays, and polymers, were tested during oxidation of phenol and its compounds [1]. In this work oxidation of phenol with hydrogen peroxide on Cu/ZSM-5 catalysts was studied. The catalysts samples were prepared by two different methods: by ionic exchange from the protonic form of commercial ZSM-5 zeolite, and by direct hydrothermal synthesis. Characterization of the catalysts extends to X-ray diffraction (XRD) and scanning electron microscopy (SEM), while the adsorption techniques were used for the measurement of the specific surface area. The catalytic tests were carried out in a stainless steel Parr reactor in batch operation mode at the atmospheric pressure and the temperature range from 323 to 338 K. The mass ratio of the active metal component on the zeolite was in the range of 1-5 %. The initial concentration of phenol and hydrogen peroxide was 0.01mol dm-3 and 0.1 mol dm-3, respectively. After the reaction mixture was heated to the desired temperature, the catalyst and the hydrogen peroxide were added into the reaction system in the appropriate amount. The decreases in phenol concentration, as well as the decomposition of hydrogen peroxide were analytically monitored. Preliminary experimental data shows the decrease of the activity (respect to phenol and hydrogen peroxide decomposition) of both catalysts with decreasing of temperature.The obtained experimental data was tested to a proposed kinetic model for phenol oxidation and hydrogen peroxide decomposition.The obtained experimental data was tested to a proposed kinetic model for phenol oxidation and hydrogen peroxide decomposition.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

Napomena
Selected papers of the proceedings of the 5th European Meeting on Chemical Industry and Environment, EMChIE 2006, held in Vienna, Austria, 3-5 May 2006

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