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Effects of Surface Features on Sulfur Dioxide Adsorption on Calcined NiAl Hydrotalcite-like Compounds

Authors Zhao, Ling
Li, Xinyong HKUST affiliated (currently or previously)
Quan, Xie
Chen, Guohua View this author's profile
Issue Date 2011
Source Environmental Science & Technology , v. 45, (12), June 2011, p. 5373-5379
Summary The hydrotalcite-based NiAl mixed oxides were synthesized by coprecipitation and urea hydrolysis approaches and employed for SO(2) removal. The samples were well characterized by inductively coupled plasma (ICP) elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and N(2) adsorption/desorption isotherm analyses. The acid-base properties were characterized by pyridine chemisorption and CO(2) temperature-programmed desorption (TPD). The calcined NiAlO from the urea method showed excellent SO(2) adsorption and its adsorption equilibrium showed a type I isotherm, which significantly improved the adsorption performance for low-concentration SO(2). Both the physical structure and the acidic-basic sites were found to play important roles in the SO(2) adsorption process. In situ Fourier transform infrared spectroscopy (FTIR) investigation revealed that adsorbed SO(2) molecules formed surface bisulfite, sulfite, and bidentate binuclear sulfate. The mechanisms for SO(2) adsorption and transformation are discussed in detail.
ISSN 0013-936X
Language English
Format Article
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