CATALYTIC DESTRUCTION OF CHLOROBENZENE AND MODEL DIOXIN COMPOUNDS WITH IRON OXIDE IN A SMALL SIZE INCINERATOR

摘要

The current study was intended to investigate the catalytic destruction of iron oxide in chlorobenzene and model dioxin compounds combustion. First, chlorobenzene was used to correlate dioxin formation with chloro content of chlorobenzene. Further, the regenerated ferric oxide catalyst was used at different combustion temperatures to evaluate its impact on dioxin formation. Finally, a referenced dioxin material was used to exanimate the capability of ferric oxide catalytic oxidation. The results indicate that PCDD/F concentrations are linearly dependent on chloro content in the feed stream. PCDD/F concentrations are significantly affected by gas temperature in the presence of ferric iron catalyst. Furthermore, the PCDD/F concentrations were significantly reduced, or from 0.78 ng-TEQ/Nm~3 (580℃) to less than 0.1 ng-TEQ/Nm~3 at temperature greater than 750℃ at the catalyst loading 100 g/hr. The destruction efficiency of the model dioxin compound is greater than 95% (in terms of TEQ) at catalyst of 300 g/hr. Among the various dioxin congeners, the destruction of the most toxic congener 2, 3, 7, 8-TeCDD is the most effective.