Zirconium Doped Hydrotalcite-based NiAl Mixed Oxides——Enhanced Performance for Adsorption of SO₂ and NO

Abstract

In the present study, the adsorptive behavior of zirconium doped hydrotalcite-based NiAl mixed oxides for reducing NO and SO₂ was compared. According to the experimental results, the Zr⁴⁺ cations were partially dissolved in crystalline NiO phase. With the addition of Zr, new centers for oxygen release and storage were formed, Lewis acid strength increased, and weakly and strongly alkaline sites were expanded. Moreover, in situ FTIR(Fourier transform infrared spectroscopy) investigation demonstrated that the amounts of surface bisulfite, sulfite, nitrite and nitrate species of ZrNiAlO were much more than those of NiAlO. On the whole, this study concluded that the addition of Zr⁴⁺ to NiAlO works to improve this compound as major absorbent for SO₂ and NO.

Keywords

SO₂ / NO / Adsorption / ZrNiAlO mixed oxide

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