In situ FTIR investigation of CO2 adsorption over MgO–Impregnated NaY zeolites

Effect of calcium on enhanced carbon capture potential of coal fly ash zeolites. Part II: a study on the adsorption mechanisms

“…This suggests a small deviation of the OCO angle from 180° due to weak interaction of the C-atom of CO 2 with the adsorbent. 65 The observation is in excellent agreement with theoretical studies, according to which the stable CO 2 adsorption form in Na-FAU is tilted and the O-bonded molecule is able to weakly interact with framework oxygen through its C-atom. 66…”

“…This suggests a small deviation of the O]C]O angle from 180 due to weak interaction of the C-atom of CO 2 with the adsorbent. 65 The observation is in excellent agreement with theoretical studies, according to which the stable CO 2 adsorption form in Na-FAU is tilted and the Obonded molecule is able to weakly interact with framework oxygen through its C-atom. 66 At high coverage the band is shied to lower frequencies (from 2288 to 2285 cm À1 ), which, according to the literature data, 67 could be associated with simultaneous adsorption of two CO 2 molecules to the same cationic site.…”

Fabricating Ga doped and MgO embedded nanomaterials for sorption-enhanced steam reforming of methanol

“…This can be ascribed to the bulk-like carbonates, due to their difficulty of desorption even at 400 °C. 52 When this is compared to the spectra of 18GaCuMg and 0GaCuMg, it can be concluded that (1) no obvious bicarbonate can be observed on the surface of either CS, and (2) both catalysts exhibited large amounts of bidentate and unidentate carbonates, but the bidentate carbonate was the dominant adsorption species over the 18GaCuMg CS. The DRIFTS results indicate that Ga doping can modulate surface carbonate properties and result in more bidentate carbonate species instead of unidentate carbonate species, which is beneficial for lowering the desorption temperature.…”

“…Of the three CO 2 adsorption types, bicarbonate is the most easily desorbed, followed by bidentate carbonate, and the release of the unidentate carbonate requires the highest desorption energy. 52 In Fig. 9c, a small vibrational peak at approximately 1344 cm À1 can be observed on the DRIFTS.…”

Indigo carmine pigment adsorption utilizing MgO nanostructures fabricated from pimpinella anisum extract

“…Peaks at 1625 and 1633 cm −1 are attributed to the bending vibration of water molecule, which may be caused by the absorption of moisture during measurements [27,28]. The Mg-O bond stretching peaks at 420 and 434 cm −1 indicate that the prepared nanomaterials are of high purity [21,29].…”