Characterization of Solid Acid Catalysts and Their Reactivity in the Glycolysis of Poly(ethylene terephthalate)

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• 作者：Minli Zhu ; Zengxi Li ; Qian Wang ; Xueyuan Zhou ; Xingmei Lu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：51
• 期：36
• 页码：11659-11666
• 全文大小：456K
• 年卷期：v.51,no.36(September 12, 2012)
• ISSN：1520-5045

文摘

Glycolysis of poly(ethylene terephthalate) with ethylene glycol was carried out with the catalysts of sulfated cobalt oxide (SO₄^{2鈥?/sup>/Co₃O₄) and zinc-modified sulfated cobalt oxide (SO₄2鈥?/sup>/Co鈥揨n鈥揙). The catalysts prepared at different calcination temperatures have been characterized by various techniques. These techniques include X-ray diffraction, Raman spectrum, gas adsorption analysis, NH₃-temperature programmed desorption, and IR spectroscopy of pyridine adsorption. The performances of these catalysts on the depolymerization of PET under mild conditions were studied, and relationships between the catalysts鈥?textural properties, the surface acidity, and the catalytic activity have been investigated. The experimental results showed that the catalytic activity on glycolysis of PET was significantly improved by the catalysts of binary sulfur oxides of SO₄2鈥?/sup>/Co鈥揨n鈥揙. The conversion of PET obtained on SO₄2鈥?/sup>/Co鈥揨n鈥揙-300 掳C was 96%, and the selectivity of BHET was 75%, after 3 h at 180 掳C under atmospheric pressure.}