Abstract
In this study, waste clay oil was used as raw material to produce high quality biofuel via catalytic pyrolysis. The thermal decomposition and pyrolysis of clay oil were studied; whereas the effects of pyrolysis temperature, carrier gas flow rate, catalytic mode and catalyst to clay oil ratio on bio-oil compositions were investigated systematically. In addition, two kinds of catalyst (MCM-41 and CaO) were also used to catalyze pyrolysis of clay oil and their catalytic effects were also compared. The optimal conditions for producing high quality biofuel were under ex situ catalytic mode, carrier gas rate of 0.1 N L/min, pyrolysis temperature of 550 °C and the catalyst ratio of 1/5. Compared to MCM-41, CaO promoted the decarboxylation of waste clay oil and improved the quality of bio-oil effectively. The acid value of CaO catalytic bio-oil was much lower than that of non-catalytic bio-oil as well as that the calorific value is much higher than that of non-catalytic bio-oil and bio-diesel.
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