KFeSbTe₃: a quaternary chalcogenide aerogel for preferential adsorption of polarizable hydrocarbons and gases

Abstract

A first quaternary telluride aerogel KFeSbTe3 is described which comprises high surface area for selective uptake of toluene and CO2.

The experimental study of biogas production when digesting chicken manure with a biochar additive

“…The higher adsorption level of H 2 S and CO 2 compared to the adsorption intensity of CH 4 can be accounted for by the fact that the molecules of H 2 S and CO 2 are smaller than those of CH 4 and fill the adsorbent pores completely, not leaving any space for CH 4 . In the performed experimental study, the results of the adsorption of H 2 S and CO 2 from biogas with a biochar additive comply with the data presented in the literature, because it did not adsorb CH 4 significantly.…”

“…However, the adsorption of CO 2 and H 2 S occurred for two reasons, including different polarizability of various investigated gaseous compounds (CH 4 , CO 2 and H 2 S) and their molecular size. The polarizability of the molecules of CO 2 and H 2 S is higher than that of CH 4 (polarizability α is expressed in 10 −24 cm 3 units: α (H 2 S) = 3.64, α (CO 2 ) = 2.9> α (CH 4 ) = 2.6) . Higher polarization of the molecules of H 2 S and CO 2 facilitates their possible interaction with the easily polarized surface of the biochar additive due to the impact of dispersive forces, since easy polarization of the biochar additive surface (due to the properties of chemical compounds of the electron donors) has a stronger relationship with higher polarizability of the investigated gaseous molecules (H 2 S and CO 2 ) compared to that of CH 4 .…”

Enhancement of CO2 and Toluene Adsorption on a Rare‐Earth Chalcophosphate Aerogel by Post Synthetic Modification with PdCl2

“…Consequently, the selectivity values would be declined. This phenomenon has been found in most metal chalcogenide aerogels , ,. [22c]…”

“…Ideal adsorbed solution theory (IAST) has been used to calculate the adsorption selectivity of an equimolar gas mixture in this aerogel , , . The result (Figure ) proves the large difference in the adsorbed amount of CO 2 in comparison to H 2 , N 2 , or CH 4 .…”

“…However, this approach is energy intensive as it involves a multistep distillation process at cryogenic temperature . Besides; it needs special handling if dealing with reactive substances as well as there is a risk of product decomposition during the separation process . The ionic liquid method was also used as an alternative, but its cost prevents commercial applications …”