Exfoliated Ni-Al LDH 2D nanosheets for intermediate temperature CO2 capture

Abstract

CO2 capture is projected as one of the pragmatic approaches to deal with the global warming phenomenon. Adsorption-based CO2 capture is considered an economically attractive option to reduce CO2 emission. The success of the adsorption-based capture primarily relies on adsorbents and thus a variety of adsorbents have been investigated in the literature. We here report a high surface area exfoliated Ni-Al LDH nanoplatelet as a possible candidate for CO2 capture at an intermediate temperature of 200 oC applicable to integrated gasification combined cycle (IGCC) and sorption enhanced water gas shift (SEWGS) reactions. The materials have been well characterized by PXRD, TGA, FTIR, TEM, SEM-EDS, and N2 adsorption surface area, and pore size distribution techniques. The CO2 capture capacity of the exfoliated Ni-Al LDH nanoplatelet is comparable to that of the widely reported Mg-Al LDH and MgO based adsorbents. The capture capacity is further improved by means of the NaNO3 impregnation and the moisture pretreatment. The investigated material has a potential of being used as a dual function material for CO2 capture as well as conversion.