Catalysis Investigation of PET Depolymerization by Superacid SO₄^2- /γ-Al₂O₃ under Microwave Irradiation

Abstract:

Solid superacids SO₄^2- /γ-Al₂O₃ were prepared with wetness impregnation method in different concentrations of sulphuric acid and calcination temperatures. Polyethylene terephthalate (PET, grains) depolymerizations were catalyzed by SO₄^2- /γ-Al₂O₃ superacids in pure water under microwave irradiation with a reaction time of 150min, a temperature of 190°C and a pressure of 200psi. The results indicated that the catalytic activity of SO₄^2- /γ-Al₂O₃ superacids was influenced by the calcination temperature, concentration of sulphuric acid and the catalyst dosage. When the superacid SO₄^2- /γ-Al₂O₃ catalyst was calcined at 600°C, soaked in 2.5 mol·L^-1 sulfuric acid solution and the catalyst dosage was 1%, a good catalytic activity appeared.

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 1073-1075
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.1073
• Online since: May 2011
• Authors: Yong Shuai Ma, Qing Hua Tang, Dong Zhang
• Keywords: Hydrolysis, Microwave Irradiation, PET, SO₄^2- /γ-Al₂O₃ superacid

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