Abstract
The pyrolysis process was a promising technology for the clean, efficient and resource utilization of iron-based waste catalysts containing wax (IWC) produced from Fisher-Tropsch synthesis. In this study, TG and Py-GCMS were used to investigate the pyrolysis characteristics of IWC. The results showed that the main pyrolysis temperature range of IWC was 200–500 °C, attributed to the decomposition of wax. Iron species in IWC were converted to Fe metal at >500 °C and slightly promoted the pyrolysis of wax. The tar components produced at low temperature were mainly alkanes of C21+ and C11C20, but linear alpha olefins of C5C20 and few dienes at higher temperature. It was also concluded that some aromatics were also produced from IWC especially at above 700 °C. TG and kinetic analyses demonstrated that pyrolysis of IWC occurred in a three-stage reaction with activation energy in the range of 126–331 kJ/mol. A possible pyrolysis mechanism of IWC was also proposed.
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