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Heterogeneous CaO(SrO, BaO)/MCF as highly active and recyclable catalysts for the glycolysis of poly(ethylene terephthalate)

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Abstract

A new group of basic species, CaO(SrO and BaO), supported on mesocellular siliceous foam (MCF) has been prepared and used for catalyzing glycolysis of poly(ethylene terephthalate), or PET. The physicochemical properties, structural features and catalytic activities of CaO(SrO, BaO)/MCF in glycolysis of PET processes were thoroughly evaluated. The results showed that CaO/MCF catalyst containing 12 wt% of CaO exhibited higher activity, which was attributed to effective dispersion of CaO and favorable transport of reactants on the 3D open porous structure of MCF. Under optimal conditions, 100% PET conversion and over 80% yield of bis(2-hydroxyethyl) terephthalate with high purity were obtained. For comparison, the activity of 12%CaO/MCF was also superior than 12%CaO/SBA-15 for the glycolysis of PET. Moreover, the 12%CaO/MCF catalyst exhibited excellent stability, and could be reused for five cycles without significant decrease in activity. Combined with the kinetic studies in the presence of 12%CaO/MCF, a possible catalytic mechanism was proposed.

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Acknowledgements

This research was supported financially by the National Natural Science Foundation of China (No. 51673106), the Science and Technology Research Project of Shandong Province (No. 2016GSF116005), the Taishan Scholars Projects of Shandong (ts201511033), the Natural Science Foundation of Shandong Province (No. ZR2018BB009) and the Scientific Research Foundation of Qingdao University of Science and Technology (No. 0100229019).

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  1. Yujun Zhao and Mengshuai Liu have contributed equally to the paper.

Authors and Affiliations

  1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, 266042, People’s Republic of China

    Yujun Zhao, Mengshuai Liu, Ruiyang Zhao, Fusheng Liu, Xiaoping Ge & Shitao Yu

  2. School of Chemistry and Chemical Engineering, Heze University, Heze, 274015, People’s Republic of China

    Yujun Zhao

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  1. Yujun Zhao
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  2. Mengshuai Liu
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  5. Xiaoping Ge
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Correspondence to Fusheng Liu.

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Zhao, Y., Liu, M., Zhao, R. et al. Heterogeneous CaO(SrO, BaO)/MCF as highly active and recyclable catalysts for the glycolysis of poly(ethylene terephthalate). Res Chem Intermed 44, 7711–7729 (2018). https://doi.org/10.1007/s11164-018-3582-y

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