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Adsorption of carbon dioxide and water vapor on fly-ash based ETS-10
Ist Teil von
Korean Journal of Chemical Engineering, 2018, 35(8), 221, pp.1642-1649
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
CO
2
capture from humid flue gas is always costly due to the irreplaceable pretreatment of dehydration in current processes, which creates an urgent demand for moisture-insensitive adsorbents with considerable CO
2
uptakes as well as remarkable H
2
O tolerances. In the present work, the microporous titanium silicate molecular sieve ETS-10 was synthesized with coal fly ash as the only silica source. The as-synthesized ETS-10 was characterized by X-ray diffraction, scanning electronic microscopy and infrared spectroscopy to verify its crystal morphology, in which neither impurity nor aggregation was observed. The following CO
2
adsorption experiments on the thermal gravimetric analyzer demonstrated its similar CO
2
adsorption capacity yet dramatical adsorption kinetics among some other microporous materials, e.g., potassium chabazite. These specific properties consequently guaranteed its favorable CO
2
adsorption capacity even at high temperatures (1.35 mmol/g at 393 K) and shortened the breakthrough time of single CO
2
flow to less than 20 s. In CO
2
/H
2
O binary breakthrough experiments, the as-obtained ETS-10 still maintained excellent CO
2
uptake of 0.81 mmol/g at 323 K, regardless of the presence of water vapor, making it a promising substitute for direct CO
2
separation from humid flue gases at practical conditions of post-combustion adsorption.