The further activation and functionalization of semicoke for CO₂ capture from flue gases

Abstract

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

The dynamic CO2 adsorption of polyethylene polyamine-loaded MCM-41 before and after methoxypolyethylene glycol codispersion

“…[4][5][6][7] So far the study of amine-loaded solid sorbents mainly focuses on immobilizing amines onto the inner surface of porous supporting materials, such as metal-organic frameworks (MOFs), [8][9][10][11][12][13] mesoporous molecular sieves, 14-22 silicas [23][24][25][26][27][28][29][30][31] and so on. [32][33][34][35][36][37][38][39][40] Chen et al incorporated polyethyleneimine (PEI) into mesoporous zeolite 13X prepared by pore-expanding original micropores; due to PEI-dispersion in mesopores, the CO 2 adsorption capacity for PEI-modied 13X reached 80 mg g À1 at 100 C under a pure CO 2 atmosphere. 16 Saha immobilized PEI in silicas and polymethyl methacrylate (PMMA) to prepare type I adsorbents, graed different amounts of aminosilanes in mesoporous SBA-15 to prepare type II adsorbents and performed breakthrough adsorption experiments.…”

Optimization of CO2 Sorption onto Spent Shale with Diethylenetriamine (DETA) and Ethylenediamine (EDA)

“…These changes indicate that the pyrolysis process has created more new pores and enlarged the original pores, thus increasing the surface area. This could be due to the escape of volatiles, water extraction, and mineral decomposition during the pyrolysis process [ 8 , 44 ]. During the amine modification, the nitrogen functional groups have impregnated the surface of the spent shale samples, thus occupying the micro- and mesopores.…”

“…However, the high sorption performance of sample USQ 06 can be attributed to its distinguishing characteristics, which have been observed in all analyses conducted, such as high TOC, the porous system under BET, basic strength for CO 2 under TPD, as well as the high CO 2 uptake compared to other samples studied under the same operating conditions and analyses. In addition, the possible sorption mechanism of the amine-modified samples and CO 2 , as explained by Wang et al [ 8 ], can be expressed as follows: where R represents hydrogen or different aliphatic carbon chains. The CO 2 –amine zwitterions are created when the single pair of electrons on the amine RNH 2 interacts with CO 2 .…”

“…Several studies were issued to improve the sorption performance of sorbents to act as both physisorbents and chemisorbents [ 8 , 9 ]. This has been made possible by introducing a new functional group to the surface of the sorbents through a chemical modification process known as “functionalization” [ 10 ].…”

“…The main sources of the nitrogen donor reside in the amine group and include monoethanolamine (MEA), ethylenediamine (EDA), diethylenetriamine (DETA), tetraethylenepentamine (TEPA), triethanolamine (TEA), etc., which have been widely studied and approved due to their environmentally friendly behavior and high sorption rate during industrial usage [ 13 ]. According to Wang et al [ 8 ], tetraethylenepentamine (TEPA) was incorporated into a coal residue through the wet impregnation method and found that at 60 °C, the modified coal increased in its quantity of CO 2 sorbed from 2.68 to 3.39 mmol/g and that the partial pressure of CO 2 does not affect the sorption capacity of the modified sample. Additionally, Tejavath et al [ 14 ] created amine-modified zeolites for CO 2 sorption with DETA, EDA, MEA, and TEA.…”