Catalytic pyrolysis of polystyrene wastes was investigated in a fluidized-bed catalytic reactor. The feed materials were GPPS(general purpose polystyrene) and EPSW(expanded polystyrene waste). Nitrogen and silica sand were used as a fluidized gas and ...
Catalytic pyrolysis of polystyrene wastes was investigated in a fluidized-bed catalytic reactor. The feed materials were GPPS(general purpose polystyrene) and EPSW(expanded polystyrene waste). Nitrogen and silica sand were used as a fluidized gas and a bed material, respectively. Powder of Fe_2O_3, BaO or HZSM-5(Si/Al=30) was used as a catalyst. Effects of pyrolysis temperature(400-550℃), gas velocity(0.3-0.6m/s) and amount of catalyst(Fe_2O_3) on the yields of oil and styrene monomer were determined, comparing with those in non-catalytic pyrolysis. It was found that the yields of oil as well as styrene monomer in the catalytic pyrolysis reactor were higher than those in the reactor without catalyst. The activity of Fe_2O_3 was higher than that of BaO or HZSM-5, while the BaO was more active than HZSM-5, thus, Fe_2O_3 was the best one within this experimental conditions. The optimum amount of Fe_2O_3 was 5wt% at 450℃ when the gas velocity was 0.5m/s.