Selective catalytic reduction of NO with NH3 on stannic and iron bimetal oxides/attapulgite catalysts

Feng Xiao1, Yunjie Gu1, Zhe Ta

Abstract

A novel low temperature selective catalytic reduction (SCR) denitration catalyst (1/2SFA) was developed by hydrothermal method in the work and used for NH3-SCR reaction. The results show the developed SFA catalyst has excellent catalytic activity for SCR of NO with NH3, the NO conversion is up to 96.4% at 200oC, Furthermore, it has good catalyst activity at low temperature (<160oC), wide optimum reaction windows (160-280oC, the NO conversion >90%), and high resisted-poison ability to SO2. The catalyst was characterized by Scanning electron microscope (SEM), N2 adsorption, X-ray diffraction (XRD) and Fourier transform infrared reflectance spectroscopy (FTIR). Besides, the possible reaction mechanism was also involved. It shows that there are existence of interactions between SnO2 and γ-Fe2O3 on the surface of attapulgite. The γ-Fe2O3 can restrain the growth of SnO2 crystal. And SnO2 can improve the dispersions of γ-Fe2O3 particles to form smaller crystal or amorphous particles. In addition, SnO2 can enhance the ability of catalyst to resist SO2 poisoning.