Hydrogenation of polystyrene to polycyclohexyl ethylene over Pd/C
QIAN Jun-feng1, GUO Xin-rong1, LIU Ping1, ZHONG Dong-wen2, SUN Zhong-hua1, WANG Xing1, WU Zhong1, WEI Mei-jun1, HE Ming-yang1
1. Jiangsu Key Laboratory of Green Catalytic Materials and Technology, School of Petrochemical Technology, Changzhou University, Changzhou 213164, China; 2. Sinopec Maoming Petrochemical Company, Maoming 525000, China
Abstract: The performances of Pd catalysts with different supports,including Pd/MCM-41,Pd/Al2O3,Pd/MC and Pd/C,in the hydrogenation of polystyrene to polycyclohexyl ethylene (PCHE) are evaluated.Meanwhile,the effects of catalyst dosage,stirring speed,reaction temperature,reaction time and reaction pressure on the hydrogenation are investigated.It is shown by results that the Pd/C catalyst with higher Pd dispersion exhibits excellent catalytic activity and stability.Under lower catalyst dosage (0.1 g) and reaction temperature (160℃),the conversion of polystyrene over Pd/C exceeds 99%.In addition,the produced PCHE has a high glass transition temperature,low density and water absorption,as well as high tensile strength.
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