Defining reactivity of solid sorbents: What is the most appropriate metric? Article

Winter, M, Hamal, D, Yang, X et al. (2009). Defining reactivity of solid sorbents: What is the most appropriate metric? . CHEMISTRY OF MATERIALS, 21(12), 2367-2374. 10.1021/cm8032884

cited authors

  • Winter, M; Hamal, D; Yang, X; Kwen, H; Jones, D; Rajagopalan, S; Klabunde, KJ

authors

abstract

  • A series of solid sorbent materials, including alumina (Al 2O 3), magnesia (MgO), titania (TiO 2), silica (SiO 2), and carbon, of widely varying physical properties, have been studied as sorbents for two toxic substances: sulfur dioxide gas (SO 2) and chemical warfare surrogate 2-chloroethyl ethyl sulfide (2-CEES, ClCH 2CH 2SCH 2CH 3). Sorbent surface areas, average pore sizes, pore volumes, surface hydroxyl groups, and nitrogen adsorption-desorption isotherms were measured. Surface areas varied from 18 m 2/g to over 1000 m 2/g, pore volumes from 0.04 to 1.2 cm 3/g, and pore diameters from 1.7 to 4.9 nm. Breakthrough studies of SO 2 and 2-CEES sorption yielded information about the effectiveness of each sorbent. Carbon samples worked well for 2-CEES but not SO 2, while silica samples were poor for both. The best MgO and TiO 2 samples were good for both SO 2 and 2-CEES, and overall, the highest surface area (459 m 2/g) TiO 2 sample was the superior sorbent. The important features for an effective sorbent under the conditions employed are high surface area and high pore volume, possessing isolated surface-OH groups, mesoporous nature, and a polar surface (Lewis base and Lewis acid sites).© 2009 American Chemical Society.

publication date

  • June 23, 2009

published in

Digital Object Identifier (DOI)

start page

  • 2367

end page

  • 2374

volume

  • 21

issue

  • 12