414 / 2018-12-26 10:03:32

Reduction of NO and CO over Fe–Cu Oxides Supported by Rice Hull Ash (RHA)

NO reduction; Iron–copper catalyst; Rice hull ash; Carbon monoxide reduction

全体主题 > 锅炉

Nitrogen oxides (NOx) are toxic gases and contribute to photochemical smog, acid rain, ozone depletion, and other air pollutions. The present work contains the studies of the effect of the phases, dispersion, O2 concentration in flue gas on the catalytic reduction of NO with CO over 20 wt.% bimetallic Fe-Cu transition metal oxides supported on rice hull ash (RHA) and γ-Al2O3, which were prepared by various procedures. All catalysts contained CuO and Fe2O3 alongside with CuFe2O4. The catalytic activity kinetics for NO and CO reduction reaction mechanism was obviously improved over the synthesized RHA when compared to alumina support. And bimetallic metal catalyst Fe2Cu1/RHA shows better activity on catalyzing monometallic metals supported by RHA. This was due to the strong interaction of Cu–Fe with the amorphous silica and activated carbon in RHA and high dispersion on the supporter, to accelerate NO and CO reduction. NO was almost reacted to N2 over Fe2Cu1/RHA from room temperature to 775K and O2 has little influence on it in our experiment conditions. CO conversion increased with temperature and about 100% CO was oxidized after 150°C over Fe2Cu1/RHA. All the materials showed an unchanged stability over the period of 20h. Metallic copper and iron were the active species for NO decomposition and CO dissociation adsorption; thus, Cu2+/Cu+/Cu0 and Fe3+/Fe2+/Fe0 redox cycle evidently played an important role in NO reduction and CO oxidization. The present results suggest that bimetallic Fe-Cu transition metal oxides supported on rice hull ash (RHA) can be used as catalysts to selectively reduce NO and CO with oxygen.