Article ID Journal Published Year Pages File Type
642610 Separation and Purification Technology 2011 6 Pages PDF
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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The use of urea method leads to smaller flower-like homogeneous aggregates. ► The more basic sites and lattice oxygen, the better adsorption performance of SO2. ► The small pore opening of 4.3 nm contributed to high adsorption of SO2 activity.

Related Topics
Physical Sciences and Engineering Chemical Engineering Filtration and Separation
Authors
, , , , , ,