| The acidity properties and gas yield in PMMA cracking followed the trends observed for the carbon removal efficiency.
The decoking rate was improved by an increase of O3 concentration in the investigated range (16–50 g/m3). Using a temperature higher than 100 ◦C was not beneficial due to the strong limitation of ozone diffusion which confined radical production – thus the regeneration process – to the outer surface. Regeneration would be thus better performed for smaller particles, but the results were already very promising: the best regenerated sample (4 h, about 100 ◦C) exhibited a similar activity as the fresh catalyst in PMMA cracking. Acknowledgements The Office of the Higher Education Commission of Thailand and the French Embassy in Thailand are gratefully acknowledged for providing financial support to Supaporn Khangkham through the program Strategic Scholarships for Frontier Research Network. The authors also thank J.L. Labat, J.L. Nadalin, I. Coghe, V. Loisel and A. Müller (LGC) for technical assistance on the set-up, M.L. de Solan Bethmale, C. Rey-Rouch, G. Raimbeaux (SAP, LGC), P. Jame, A. Bonhomme (SCA, Lyon), L. Pinard and J.D. Comparot (IC2MP, Poitiers) for characterization of the zeolites. References [1] J. Weitkamp, L. Puppe, Catalysis and Zeolite: Fundamentals and Applications, Springer-Verlag, Berlin, Heidelberg, 1999. |
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