To separate CO2 from coal-fired power plant emissions, semicoke, which is cheap and easy to obtain, was further activated to use as the carrier and tetraethylenepentamine (TEPA) was impregnated in the activated semicoke to prepare solid amine sorbents. The effects of activating agents, adsorption temperature, and the presence of water on CO2 sorption were investigated in a fixed-bed reactor, and the regenerability and adsorption kinetics for prepared sorbents were also studied. The equilibrium adsorption capacity for N2-activated semicoke (SE-N2) was 2.70 and 2.14 mmol/g at 20 °C when water was absent and present, respectively, and the equilibrium adsorption capacity for 10 wt % TEPA-modified N2-activated semicoke (SE-N2-TEPA10%) was 3.24 and 3.58 mmol/g at 60 °C when water was absent and present, respectively. After 10 cyclic regenerations, the adsorption capacity for SE-N2-TEPA10% reduced by 7.7% under dry conditions, and SE-N2-TEPA10% showed good regenerability.

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Abstract:A new hydrated benzimidazolium salt containing spiro structure was obtained when benzimidazole is added to ethyl alcohol of 1,5-dioxaspiro[5.5]undecane-2,4-dione and trimethoxymethane. The title compound (C 19 H 21 O 8 ) (C 7 H 7 N 2 ) (0.5H 2 O) was characterized by elemental analysis, IR, UV-Vis, and single-crystal X-ray diffraction. The result shows that it belongs to the triclinic system, space group P-1, with a = 11.017 (2)

1187. In 1, there exist some intra-and inter-molecular hydrogen bonds and C-H¨¨¨π supramolecular interactions, while there are still 𨨨π stacking interactions except for some intra-and intermolecular hydrogen bonds in 2. Two compounds both form a three-dimensional network structure via above intermolecular interactions.

The design and development of low-cost sorbents is of vital importance for CO2 capture from flue gases. In this study, the lignite char from Ordos coal (SE) was treated by...

Abstract:Two new oxaspirocyclic compounds, 8-(4-(dimethylamino)benzylidene)-6,10-dioxaspiro [4.5] decane-7,9-dione (1) and 8-(4-hydroxybenzylidene)-6,10-dioxaspiro[4.5]decane-7,9-dione (2) have been synthesized and their structures determined by single crystal X-ray crystallography. Compound 1, C 17 H 19 NO 4 , belongs to the monoclinic system, space group P21/c with a = 6.2554 (13)

To systematically study CO2 adsorption performance, semicoke from the low-rank lignite was further activated and functionalized for CO2 capture from flue gases.