A review on catalytic oxidation of chloroaromatics from flue gas

Cuicui Du [Zhejiang University, China ] Shengyong Lu [Zhejiang University, China ] Qiuling Wang [University of Shanghai for Science and Technology, China] Buekens, Alfons G. [Zhejiang University, China ] Mingjiang Ni [Zhejiang University, China ] Debecker, Damien P. [UCL]

Commercial catalysts for the catalytic oxidation of chloroaromatics are mainly based on either noble metals or transition metal oxides supported on a suitable carrier. This paper reviews studies relative to these two generic groups of catalysts and their performances for chloroaromatic decomposition, i.e. conversion efficiency, stability and selectivity towards harmless products (e.g., CO2), and in particular, avoiding the formation of polychlorinated by-products. The various approaches towards improved catalysts, including tuning the support, adding dopants or promoters, improving the preparation methods, or auxiliary means such as the introduction of ozone (O3) or hydrogen peroxide (H2O2) in the gas to be treated, and combination with non-thermal plasma treatment are systematically reviewed. This review also appraises various modes of deactivation (i.e., originating from fouling, coking, poisoning, sintering of the catalyst, and from volatilization of its active phases) as well as possible methods for regeneration.