OP-II-3

PP-III-48the range of 29-87 kJ/mol for catalysts having Al/Si ratios of 0.026-0.67 in thesynthesized material, while the activation energy of polypropylene decompositionreaction in the absence of catalyst was about 172 kJ/mol. In the case of usingaluminum sulphate as the aluminum source in the synthesis of the catalysts, theactivation energy values of degradation reaction were found to be decreased down toabout 49-73 kJ/mol.Figure 1. TGA plots describing the degradation of polypropylene over SBA-type catalystssynthesized using different aluminum sources: (a)Al 2 (SO 4 ) 3 .18H 2 O, and (b)C 9 H 21 AlO 3 .References[1]. Gobin, K., and G. Manos, Polym. Degrad. Stab., 2004, 83, 267.[2]. Lin,Y.-H. and H.Y. Yen, Polym. Degrad. Stab., 2005, 89, 101.[3]. Obalı, Z., Sezgi, N.A., and T. Doğu, Chem. Eng. Comm., 2009, 196, 116.[4]. Fulvio, P.F., Pikus, S., and Jaroniec, M., J. Coll. Inter. Sci., 2005, 287 717.AcknowledgementsFinancial supports of Middle East Technical University through BAP-2007-03-04-08 andThe Scientific and Technological Research Council of Turkey through 107M303 projects aregratefully acknowledged.527