Abstract:
Ni catalysts have been known as effective catalysts in plastic gasification, especially catalysis in steam reforming reaction. This research attempted to investigate effects of various supports including Al2O3, SiO2 and Talc over nickel catalyst on steam/O2 gasification of different types of plastic. Experiments were carried out in a drop tube fixed bed reactor at 850°C for 60 min. Four types of plastic, including HDPE, LDPE, PP and PS, were used in this work. The results revealed that NiO/Al2O3 catalyst was suitable to gasification of both HDPE and LDPE. In case of PP gasification, it found that NiO/SiO2 catalyst showed higher activity than other Ni-based catalysts. Nevertheless, NiO/Talc catalyst showed a good activity on gasification of PS due to larger pore size more assisted in decomposition of aromatic compound in pores. Moreover, influence of calcination temperature was studied. It found that higher calcination temperature resulted in decreasing of catalytic activity due to loss of specific surface area and also strong metal-support interaction. Finally, Ni-supported catalysts were carried out for 6 times to examine their stability. It revealed that increase in activity test up to 6 times resulted in decrease in activity because of deactivation by sintering of Ni and solid transformation of catalyst.