Key Words:Magnesia;Adsorption - Carbon dioxide - Catalyst selectivity - Convergence of numerical methods - Dispersions - Zeolites
Abstract:Zeolite Y supported MgO (denoted as MgO@Y) composites have been successfully prepared using Mg(NO<inf>3</inf>)<inf>2</inf> as precursor via a facile solid-state heat dispersion approach. The samples are characterized by X-ray diffraction and N<inf>2</inf> adsorption/desorption, and investigated for CO<inf>2</inf> adsorption performance including adsorption capacity, adsorption selectivity and stability. The results reveal that MgO can be highly dispersed on the surfaces of zeolite Y support after the activation at high temperatures, and the monolayer dispersion capacity of MgO on zeolite Y support is 3 mmol/g zeolite Y. The resulting MgO(3.0)@Y adsorbent with the magnesium loadings of 3 mmol/g zeolite Y displays a high CO<inf>2</inf> adsorption capacity of 2.78 mmol/g at 500 kPa, which is about 28% higher than that of zeolite Y support. Moreover, the MgO(3.0)@Y adsorbent displays a high CO<inf>2</inf>/N<inf>2</inf> adsorption selectivity of 32 and a excellent cyclic stability. Its good performance as well as its facile preparation process make it attractive candidate for the adsorption of CO<inf>2</inf> in flue gas vents. In addition, the isosteric heat of CO<inf>2</inf> adsorption on the MgO(3.0)@Y sample was calculated from the Clausius–Clapeyron equation, and the values the isosteric heats of adsorption lie in the range of 27.8–20.0 kJ/mol.<br/> © 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Issue:5
Translation or Not:no