Stability of ZSM-11 and BETA zeolites during the catalytic cracking of low-density polyethylene |
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Authors: | María S Renzini Laura C Lerici Ulises Sedran Liliana B Pierella |
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Institution: | a Grupo Zeolitas - CITeQ (Centro de Investigación y Tecnología Química), Facultad Córdoba, Universidad Tecnológica Nacional, Maestro López esquina Cruz Roja Argentina S/N, 5016 Córdoba, Argentina b INCAPE (Instituto de Investigaciones en Catálisis y Petroquímica), Facultad de Ingeniería Química, Universidad Nacional del Litoral (FIQ, UNL - CONICET), Santiago del Estero 2654, S3000AOJ Santa Fé, Argentina |
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Abstract: | The stability of H-ZSM-11 (H-Z) and H-BETA (H-B) zeolites during the catalytic degradation of low-density polyethylene (LDPE) was studied using the same sample of catalyst in eleven consecutive cycles. The gaseous hydrocarbons, liquid hydrocarbons and waxes generated in each cycle were analyzed as well as the used catalyst. The zeolites were characterized by XRD, FTIR of adsorbed pyridine and N2 adsorption, while the physical mixtures of LDPE/zeolites were subjected to TG-DTG analysis.The H-Z zeolite exhibited an important stability during the successive cycles of LDPE conversion. On the contrary, the behavior H-B zeolite was completely different; from the sixth cycle the yields of products changed progressively, approaching to that obtained in a purely thermal process.The yields of accumulated coke increased steadily throughout the cycles up to maximum values in the eleventh cycle of ∼6 and ∼15 wt% for H-Z and H-B, respectively. These results were confirmed by TG under air flow. |
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Keywords: | H-ZSM-11 H-BETA LDPE Deactivation Coke |
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