abstracts - Институт катализа им. Г.К. Борескова

OP-I-6acidity measurements of the H-ZSM-5, H-MCM-41 and H-MCM-22 catalysts by FTIR ofadsorbed pyridine and TPD of ammonia showed that all the materials possess Lewis andBrönsted acid sites. Catalytic pyrolysis of low density polyethylene (LDPE), the mainconsituent of plastics wastes, over proton modified microporous and mesoporous molecularsieves have been investigated. The catalytic activity pattern decreased as follows:H-MCM-22 > H-MCM-41 > H-ZSM-5-31 (Figure 2). A comparison of the catalytic resultsshows that structure of zeolite, acidity, pore size and surface area are important parameters fora catalyst to be active in the catalytic decomposition of LDPE. The influence of structure ofzeolite and mesoporous material, acidity, porosity and surface area will be discussed in detailfor the catalytic pyrolysis of LDPE.50001204000100Counts30002000%w8060LDPELDPE + HZSM-5-31LDPE + H-MCM-41LDPE + H-MCM-2210004000 20 40 60 802 Theta20050 100 150 200 250 300 350 400 450 500 550T(ºC)Fig. 1. Fig. 2.References:1 J.Aguado and D. Serrano. Feedstock Recycling of Plastic Wastes. The Royal Society ofChemistry. Cambridge, UK (1999).2 T. A. J. Hardenberg, L. Mertens, P. Mesman, H. C. Muller, C. P. Niocolaides, Zeolites 12(1992) 685.3 M. K. Rubin, P. Chu, U. S. Patent 4954325 (1987).4 R. Ravishanker, D. Bhattacharya, N. E. Jacob. S. Sivasanker, Microporous Materials 4(1995) 83.5 J. S. Beck, J. C. Vartuli, W. J. Roth, M. E. Leonowicz, C. T. Kresge, K. D. Schmitt,C. T. W. Chu, D. H. Olson, E. W. Sheppard, S. B. MCcullen, J. B. Higgins,J. L. Schlenker, J. American Chem. Soc. 114 (1992) 10834.6 K. M. Reddy, C. Song, Catalysis Lett. 36 (1996) 103.7 Marcilla A., M.I. Beltran, F. Hernandez and R. Navarro, Applied Catalysis A: General.278 (2004) 37-43.83