ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Oxidation of thiophene over copper-manganese mixed oxides

Małgorzata I. Szynkowska, Aneta Węglińska, Elżbieta Wojciechowska, and Tadeusz Paryjczak

Institute of General and Ecological Chemistry, Technical University of Lodz, Zeromskiego 116, 90 - 924 Lodz, Poland

E-mail: miszynk@p.lodz.pl

Received: 1 April 2008  Revised: 17 October 2008  Accepted: 27 October 2008

Abstract: Commercial hopcalite calcined at different temperatures and hopcalite modified with noble metals (Pt, Pd, and Au) were studied in oxidation of thiophene. Surface and bulk properties of catalysts were studied using temperature-programmed reduction (TPR_H2), X-ray diffraction method (XRD) and thermal analysis (TG-DTA-MS). It was shown that calcined samples displayed higher activity in comparison with commercial untreated hopcalite; however, a lower temperature of calcination was favourable. High temperature of thermal treatment induced an increase in the crystallinity and a decrease in the surface area of the samples, and, as a consequence, the loss of catalysts activity. Moreover, marked improvement in the catalytic performance of platinum and palladium modified catalysts in relation to base hopcalite was observed. The obtained results indicate that the higher activity of samples containing Pt and Pd was accompanied by better reducibility of the catalysts.

Keywords: thiophene - VOC oxidation - odours - hopcalite

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-009-0001-2

Chemical Papers 63 (2) 233–238 (2009)