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Evaluation of Sodium/Protonated Titanate Nanotubes Catalysts in Virgin and Post Consumer PET Depolymerization

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Abstract

The high PET consume, mainly as bottles, associated with rapid disposal and high resistance to ambient conditions and biological degradation lead to accumulation in the enviromental, constituting a worrying scenario in world level. Chemical recycle PET by glycolysis is an important alternative, once bis(hydroxiethyl)terephthalate (BHET), high added value monomer, can be obtained. In this context, this study approaches the use of titanate nanotubes (i.e. sodium/protonated titanate nanotubes) as catalyst for PET glycolysis. Reactional conditions, the origin and granulometry of PET flakes were evaluated (at 196 °C). Best results (BHET yield > 80%) were obtained for both catalyst in 3 h of reaction. The protonated titanate nanotubes catalyst were more efficient than sodium titanate nanotubes due to greater concentration of Brönsted and Lewis acid sites, indicated by TPD analyzes.

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior – Brasil (CAPES) – Finance Code 001. The authors thank CNPq and CAPES by scholarships. PUCRS and UFRGS for technical support: the Laboratório Central de Microscopia e Microanálise (LabCEMM/PUCRS) by morphological analyzes, the Prof. Dr. Oscar W. Perez Lopez and the Laboratório de Processos Catalíticos (PROCAT/UFRGS) by TPD analyzes.

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  1. G. R. Lima and W. F. Monteiro contributed equally to this work.

Authors and Affiliations

  1. Graduate Program in Mining, Metallurgical and Materials Engineering, Federal University of Rio Grande do Sul, UFRGS, Porto Alegre, Brazil

    G. R. Lima & R. M. C. Santana

  2. Graduate Program in Materials Engineering and Technology, Pontifical Catholic University of Rio Grande do Sul - PUCRS, Porto Alegre, Brazil

    W. F. Monteiro, C. M. Scheid & R. A. Ligabue

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  1. G. R. Lima
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  2. W. F. Monteiro
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Correspondence to R. A. Ligabue.

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Lima, G.R., Monteiro, W.F., Scheid, C.M. et al. Evaluation of Sodium/Protonated Titanate Nanotubes Catalysts in Virgin and Post Consumer PET Depolymerization. Catal Lett 149, 1415–1426 (2019). https://doi.org/10.1007/s10562-019-02724-8

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