Naslov
Comparison of the activity of Cu/ZSM5 zeolite catalysts prepared by ion-exchange method and direct hydrothermal synthesis method

Autori
Maduna Valkaj, Karolina ; Granato, Teresa ; Katovic, Andrea ; Tomašić, Vesna ; Zrnčević, Stanka

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
CD-ROM of Full Texts CHISA 2006 / Chech Society of Chemical Engineering - Prag, 2006, 1-10

Skup
17th International Congress of Chemical and Process Engineering CHISA 2006

Mjesto i datum
Prag, Češka Republika, 27.08.2006. - 31.08.2006

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
katalitička oksidacija; direktna hidrotermalna sinteza; ionska izmjena; zeolit; vodikov peroksid; fenol
(catalytic oxidation; direct hydrothermal synthesis; ion exchange; zeolite; hydrogen peroxide; phenol)

Sažetak
Comparison of the Activity of a Cu-ZSM5 Zeolite Catalysts Prepared by an Ion-Exchange Method and Direct Hydrothermal Synthesis Method K. Maduna Valkaj, T. Granato1, A. Katovic1, V. Tomasic, S. Zrncevic University of Zagreb, Faculty of Chemical Engineering and Technology, Department of Reaction Engineering and Catalysis, Marulićev trg 19, 10000 Zagreb, Croatia ; e-mail: kmaduna@fkit.hr ; 1Universita della Calabria, Dip. Ingegneria Chimica e dei Materiali, Via P. Bucci, Cubo 45, Arcavacata di Rende, Italia The necessity to remove organic pollutants from the industrial wastewater streams has forced the development of new technologies that can produce better results in terms of pollutant removal and process efficiency in the combination with the low investment and operating costs. One of the new emerging processes with a potential to fulfill this demands is a catalytic wet peroxide oxidation, commonly known as a CWPO process. The oxidative effect of the hydrogen peroxide is intensified by the addition of the heterogeneous catalyst that can reduce the operating conditions to atmospheric pressure and temperatures bellow 100°C. In this work catalytic activity and stability of Cu-ZSM5 zeolite samples prepared by two different synthesis methods in a reaction of a phenol oxidation with hydrogen peroxide solution in aqueous medium is being studied. The synthesis procedures of the catalysts in question are: the classic ion exchange method and the alternative direct hydrothermal synthesis method. The catalysts were characterized with powder 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 60 to 80 °C. The mass ratio of the active metal component on the zeolite was in the range of 1-5 %. The initial concentration of phenol solution was equal to 1 g dm-3 and was kept constant. 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. The obtained experimental data was tested to a proposed kinetic model for phenol oxidation and hydrogen peroxide decomposition. The kinetic parameters were estimated using the Nelder-Mead method of nonlinear regression.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

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