Evolution of the deactivation mode and nature of coke of HZSM-5 and USY zeolites in the catalytic cracking of low-density polyethylene during successive cracking runs |
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| Authors: | A Marcilla A Gómez-Siurana FJ Valdés |
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| Affiliation: | 1. Instituto de Química, UNESP - Univ. Estadual Paulista, Prof. Francisco Degni 55, CEP 14800-900, Araraquara, SP, Brazil;2. Embrapa Instrumentação, Rua 15 de Novembro 1452, CEP 13560-970, São Carlos, SP, Brazil;3. Centro de Pesquisas em Materiais Avançados e Energia - Universidade Federal de São Carlos, Rodovia Washington Luis, km 235, CEP 13565-905, São Carlos, SP, Brazil;1. State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China;2. Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China;3. Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, 1390 Eckles Ave., St. Paul, MN 55108, USA;4. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;5. Department of Biological Systems Engineering, Washington State University, 2710 Crimson Way, Richland, WA 99354, USA;1. Instituto de Macromoléculas Eloisa Mano, Universidade Federal do Rio de Janeiro – UFRJ, Av. Horácio Macedo, 2030, Centro de Tecnologia, Bloco J, Rio de Janeiro, Brazil;2. Instituto de Química, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, Maracanã, Rio de Janeiro, Brazil;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 1022495, China;2. Aromatic Plant of Yangzi Petrochemical Company Ltd., SINOPEC, Nanjing 210048, China;1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;2. Advanced Membranes and Porous Materials Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;3. China-America Cancer Research Institute, Key Laboratory for Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong 523808, China;4. Beijing National Laboratory for Condensed Mater Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | The coke deposited in the HZSM-5 zeolite at higher coke levels causes a more important pore blockage than the coke deposited in the HZSM-5 zeolite at low coke content. On the other hand, it would appear that there is an important deactivation mode change in the USY coked zeolites during the cracking runs and when the coke level in the catalyst increases an important pore blockage is observed. In the HZSM-5 zeolite, it seems that the formation of insoluble coke during the several polymer cracking runs, as well as the possible location in the external surface could be responsible for the important pore blockage observed in this zeolite. In the USY coked zeolites, the study of the nature of the soluble coke suggests that the pyrene compounds and their evolution to insoluble coke could probably be responsible for the important pore blockage observed after the second cracking run. |
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