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The NiAl mixed oxides: The relation between basicity and SO2 removal capacity

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Authors
Zhao, L.
Li, X.
Qu, Z.
Zhao, Q.
Liu, Shaomin
Hu, X.
Date
2011
Type
Journal Article

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Zhao, Ling and Li, Xinyong and Qu, Zhenping and Zhao, Qidong and Liu, Shaomin and Hu, Xijun. 2011. The NiAl mixed oxides: The relation between basicity and SO2 removal capacity. Separation and Purification Technology. 80: pp. 345-350.
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Separation and Purification Technology
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Department of Chemical Engineering
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Abstract

A series of NiAl mixed oxides derived from hydrotalcite-like compounds were prepared by a urea hydrolysis method, and characterized by TGA, XRD, SEM, CO2-TPD, N2 adsorption/desorption and XPS techniques. The SO2 adsorption capacity of the materials correlated closely with their basicity and active oxygen species on the surface, as estimated by a volumetric method. The NiAl mixed oxide with the optimal Ni/Al molar ratio of 3 showed the best performance of SO2 adsorption. Moreover, its adsorption equilibrium of a type I isotherm and pore opening in the quasi-micropore region significantly improve the adsorption performance for low-concentration SO2.