TY - JOUR
T1 - Effects of surface features on sulfur dioxide adsorption on calcined NiAl hydrotalcite-like compounds
AU - Zhao, Ling
AU - Li, Xinyong
AU - Quan, Xie
AU - Chen, Guohua
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2011/6/15
Y1 - 2011/6/15
N2 - The hydrotalcite-based NiAl mixed oxides were synthesized by coprecipitation and urea hydrolysis approaches and employed for SO2 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 N2 adsorption/desorption isotherm analyses. The acid-base properties were characterized by pyridine chemisorption and CO2 temperature- programmed desorption (TPD). The calcined NiAlO from the urea method showed excellent SO2 adsorption and its adsorption equilibrium showed a type I isotherm, which significantly improved the adsorption performance for low-concentration SO2. Both the physical structure and the acidic-basic sites were found to play important roles in the SO2 adsorption process. In situ Fourier transform infrared spectroscopy (FTIR) investigation revealed that adsorbed SO2 molecules formed surface bisulfite, sulfite, and bidentate binuclear sulfate. The mechanisms for SO 2 adsorption and transformation are discussed in detail. © 2011 American Chemical Society.
AB - The hydrotalcite-based NiAl mixed oxides were synthesized by coprecipitation and urea hydrolysis approaches and employed for SO2 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 N2 adsorption/desorption isotherm analyses. The acid-base properties were characterized by pyridine chemisorption and CO2 temperature- programmed desorption (TPD). The calcined NiAlO from the urea method showed excellent SO2 adsorption and its adsorption equilibrium showed a type I isotherm, which significantly improved the adsorption performance for low-concentration SO2. Both the physical structure and the acidic-basic sites were found to play important roles in the SO2 adsorption process. In situ Fourier transform infrared spectroscopy (FTIR) investigation revealed that adsorbed SO2 molecules formed surface bisulfite, sulfite, and bidentate binuclear sulfate. The mechanisms for SO 2 adsorption and transformation are discussed in detail. © 2011 American Chemical Society.
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U2 - 10.1021/es200784e
DO - 10.1021/es200784e
M3 - RGC 21 - Publication in refereed journal
C2 - 21609013
SN - 0013-936X
VL - 45
SP - 5373
EP - 5379
JO - Environmental Science and Technology
JF - Environmental Science and Technology
IS - 12
ER -