Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 80, Issue 2, Pages 345-350Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2011.04.035
Keywords
SO2 removal; NiAl mixed oxides; Adsorption
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Funding
- National Nature Science Foundation of China [20877013, 20837001]
- National High Technology Research and Development Program of China (863 Program) [2007AA061402, 2009AA062604]
- Major State Basic Research Development Program of China (973 Program) [2007CB613306]
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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, N-2 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. (C) 2011 Elsevier B.V. All rights reserved.
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