CO2 capture using zeolite 13X prepared from bentonite

Zeolite 13X was prepared using bentonite as the raw material by alkaline fusion followed by a hydrothermal treatment without adding any extra silica or alumina sources. The prepared zeolite 13X was characterized by X-ray powder diffraction, N-2-adsorption-desorption measurements, and scanning electron microscopy. The CO2 capture performance of the prepared zeolite 13X was examined under both static and flow conditions. The prepared zeolite 13X showed a high BET surface area of 688 m(2)/g with a high micropore volume (0.30 cm(3)/g), and exhibited high CO2 capture capacity (211 mg/g) and selectivity to N-2 (CO2/N-2 = 37) at 25 degrees C and 1 bar. In addition, the material showed fast adsorption kinetics, and stable CO2 adsorption-desorption recycling performance at both 25 and 200 degrees C. (C) 2013 Elsevier B.V. All rights reserved.