Influence of the final “ageing” temperature on the regeneration behaviour and location of the coke obtained in the HZSM-5 and USY zeolites during the LDPE cracking |
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| Authors: | A Marcilla A Gómez-Siurana FJ Valdés |
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| Affiliation: | 1. Université de Poitiers, CNRS UMR7285, Institut de Chimie des Milieux et Matériaux de Poitiers, B27, TSA 51106, 4 rue Michel Brunet, 86073 Poitiers Cedex 9, France;2. Laboratoire de Physico-chimie des Matériaux et Catalyse, Faculté des Sciences Exactes, Université de Bejaia, 06000 Bejaia, Algeria;3. LEPCMAE, Faculté de Chimie, Université des Sciences et de la Technologie Houari Boumediene (USTHB), B.P. 32, El Alia, 16111 Alger, Algeria;1. Department of Chemistry and Materials Science, Tokyo Institute of Technology, 2-12-1-E1-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;2. Department of Chemistry, Tokyo Institute of Technology, 2-12-1-E1-10 Ookayama, Meguro-ku, Tokyo 152-8551, Japan;1. College of Materials Science and Engineering, Qingdao University of Science & Technology, 53 Zhengzhou Road, Qingdao, 266042, PR China;2. International Center of Future Science, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China;3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China;1. Department of Chemical and Biomedical Engineering, West Virginia University, Morgantown, VA 26506, United States;2. Molecule Works Inc., Richland, WA 99354, United States |
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| Abstract: | In this work, the influence of the “ageing” temperature on the location and regeneration behaviour of the coke obtained in the cracking of LDPE in the presence of HZSM-5 and USY zeolites is studied. The coke content in the zeolites is influenced by the thermal treatment, and for both zeolites studied, the higher the final cracking temperature the lower the coke content. The nitrogen adsorption isotherms have shown the different deactivation mechanisms, related to the possible different locations of the coke on each zeolite and the influence of the final cracking temperature on these parameters. The regeneration study of the coked zeolites has shown that the coke combustion process strongly depends on the insoluble content of the coke (i.e., of the presence of bulky polyaromatic compounds) and of the zeolite framework. |
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