EFFECT OF METAL DOPED ZSM-5 CATALYST ON AROMATIC YIELD AND COKE FORMATION IN MICROALGAL BIO-OIL PRODUCTION

Abstract

It has been known that synthetic zeolites as a cracking catalyst can increase aromatic hydrocarbon amount by providing deoxygenation of pyrolytic bio-oil. However, deactivation of zeolite because of coke deposition has been a serious problem. In this study, Ni and Co metals which was impregnated to ZSM-5 were used as catalyst for co-pyrolysis of Spirulina–Polystyrene and Spirulina-Polyethylene. The yields of bio-oils were compared to each other. The bio-oils which formed from catalytic co-pyrolysis were analyzed via GC-MS. Amounts of target aromatic compounds which were benzene, o-xylene, naphthalene in the bio-oils were determined. Coke amounts on the catalysts were computed. Regarding coke deposition (11%) and bio-oil yield (55%), it was determined that Ni-ZSM-5 was an effective catalyst for co-pyrolysis Polystyrene and Spirulina. For Spirulina and Polyethylene, it was obtained that bio-oil yield and coke deposition were 50% and 14% for Ni-ZSM-5.