Study of thermodynamic characteristics of CO adsorption on Li exchanged zeolites

Čičmanec, Pavel; Bulánek, Roman; Frýdová, Eva; Kolářová, M.

doi:10.1007/s10450-012-9461-8

Cited by 9 publications

(2 citation statements)

References 20 publications

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“…For an effective adsorption technology, adsorbent plays the key role (Xiao et al 2014). Till now, developed adsorbents for CO adsorption include zeolites (Wirawan and Creaser 2006;Delgado and Arean 2011), reduced metals (Iyuke et al 2000;Miyajima et al 2005), carbon materials (Grande et al 2008;Lopes et al 2009;Č ičmanec et al 2013), metal organic frameworks (Chavan et al 2009;Leclerc et al 2011;Chowdhury et al 2012), soft nanoporous crystal (Sato et al 2014), etc. Among these, carbon materials and functional carbon materials show great promises due to its rich abundance, low cost, as well as rich porosity and tunable functionalities (Xiao et al 2008;Liu et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Huang

et al. 2015

Adsorption

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The objective of this work is to develop CuCl@AC adsorbent with high CO capacity and selectivity from CO/N 2 binary gas mixture. A series of CuCl@AC adsorbents were prepared by a solid-state auto dispersion method, and then characterized by N 2 adsorption test, XRD and XPS. CO and N 2 adsorption isotherms on the adsorbents were measured by a volumetric method. The adsorption isotherms and selectivities of CuCl@AC adsorbents for CO/N 2 binary mixture were estimated on the basis of ideal adsorbed solution theory (IAST). Results showed that (a) CO uptakes of CuCl@AC increased with CuCl loading in the loading range of 0-1.2 g/g. The maximal CO adsorption capacity of the CuCl@AC with CuCl loading of 1.2 g/g reached 38 cc/g at the P/P 0 of 0.40, around 8 times of that over the original AC; (b) calcination time for the preparation of Cu(I)@AC had significantly impact on CO adsorption of the adsorbents due to valence change of Cu species on carbon surfaces. XPS analysis indicated that when the calcination time was optimized to be 1 h at 350°C under argon, the prepared Cu(I)@AC had the highest percentage of Cu ? species on its surfaces, and consequently it had the highest CO capacity among the adsorbents since adsorptive species responsible for CO adsorption is Cu ? ; (c) The IAST-predicted CO/N 2 adsorption selectivities of 1.2CuCl/AC decreased with pressure. Its CO/N 2 selectivity was up to 100-450 at low pressure range of 0-10 kPa, and it remained in the range of 50-100 at higher pressure range of 20-100 kPa. The high adsorption capacity and selectivity of Cu(I)@AC adsorbents made it a promising adsorbent for CO/N 2 mixture separation.

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Section: Introductionmentioning

confidence: 99%

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Huang

et al. 2015

Adsorption

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“…MCM-22 (MWW topology structure in IZA code) has shown interesting structure with large and medium pore size including 12-MR large supercage (7.1 x 7.1 x 18.2Å) connected with 10-MR crossing window (4.0 x 5.4Å) and 10-MR sinusoidal channels (4.0 x 5.9Å) located in the intralayer space of MCM- 22 [1]. This material with metal or alkali ion exchange has been used in many applications for catalysis, adsorption [2][3][4][5][6]. Among of exchange ions in MCM-22, Cu + cation exchange in MCM-22 zeolite (Cu(I)-MCM-22) is promising for catalytic reaction in NO, N 2 O decomposition process into N 2 and O 2 [7].Although Cu(I)-MCM-22 showed disadvantage such as: low reactivity, it illustrated promising material for NO or N 2 O decomposition process because of maintaining reactivity for long time steaming.…”

Section: Introductionmentioning

confidence: 99%

CO interaction with Cu(I)-MCM-22 zeolite: density functional theory investigation

Viet

Nachtigall

2014

Sci. Tech. Dev. J.

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MCM-22 zeolite has been widely used in many applications for catalysis and adsorption. Especially, this material exchanged with Cu+ cation (Cu(I)-MCM-22) is an active catalyst in green chemical reaction, such as decomposition of NO and N2O. The local geometry of Cu+ in vicinity of Al (III) replacement in six different Si (IV) sites and CO interaction with the most stable Cu+ in each Al site were explored using periodic density functional theory (DFT) method. The CO stretching frequencies were computed applying the ω/r scaling method in which frequencies were determined at high quantum level (couple cluster) and CO bond length calculated at DFT level. The results showed that Cu+ cation located in the channel wall position and intersection position coordinated with 3 or 2 framework oxygen atoms, respectively, before CO adsorption and Cu+ cation coordinated with 2 framework oxygen atoms after CO adsorption. The interaction energies between CO and Cu+ cation were in range - 148 to -195 kJ.mol-1 and CO frequencies exhibit two peaks at 2151 and 2159 cm-1 in good agreement with experimental data. This investigation brought us to understand the Cu+ location in MCM-22 and CO adsorption in Cu(I)-MCM-22 zeolite.

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Evaluation of the Inhibiting Effect of Organic Compounds on the Adsorption of Iodine Compounds in Cation-Exchanged Zeolites: A DFT Study

Hessou

Jabraoui

Chebbi

et al. 2018

Advances in Science, Technology &Amp; Innovation

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Study of thermodynamic characteristics of CO adsorption on Li exchanged zeolites

Cited by 9 publications

References 20 publications

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

Preparation of CuCl@AC with high CO adsorption capacity and selectivity from CO/N2 binary mixture

CO interaction with Cu(I)-MCM-22 zeolite: density functional theory investigation

Evaluation of the Inhibiting Effect of Organic Compounds on the Adsorption of Iodine Compounds in Cation-Exchanged Zeolites: A DFT Study

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