eprintid: 5975
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/59/75
datestamp: 2023-11-09 16:17:43
lastmod: 2023-11-09 16:17:43
status_changed: 2023-11-09 16:04:25
type: article
metadata_visibility: show
creators_name: Elkhalifah, A.E.I.
creators_name: Azmi Bustam, M.
creators_name: Shariff, A.M.
creators_name: Murugesan, T.
title: Selective adsorption of CO2 on a regenerable amine-bentonite hybrid adsorbent
ispublished: pub
keywords: Adsorbents; Adsorption; Adsorption isotherms; Bentonite; Catalyst selectivity; Desorption; Ethanolamines; Hybrid materials; Suspensions (components); Thermodynamics, Adsorption measurement; Adsorption-desorption cycles; Equilibrium isotherms; Magnetic suspension balance; Regenerability; Specific surface area and porosities; Structural characteristics; Thermodynamic parameter, Carbon dioxide, adsorption; bentonite; carbon dioxide; desorption; isotherm; magnesium; thermodynamics
note: cited By 26
abstract: The ability of magnesium form of bentonite modified by monoethanolammonium cations (MEA+-Mg-bentonite) to reversibly and selectively adsorb CO2 over other light gases, such as CH4 and N2 has gravimetrically been investigated using a Magnetic Suspension Balance (MSB) equipment. Before CO2 adsorption measurements, untreated bentonite and MEA+-Mg-bentonite were characterized by XRD, FTIR, TGA and BET techniques to establish their structural characteristics, thermal stability and specific surface area and porosity characteristics. The results showed that MEA+-Mg-bentonite adsorbed higher CO2 amount compared to untreated bentonite under similar conditions. The equilibrium isotherms for CO2 adsorption on untreated bentonite and MEA+-Mg-bentonite were measured at 25, 50 and 75°C and a pressure range of 01.0bar. It was found that MEA+-Mg-bentonite has static CO2 adsorption capacities of 0.79, 0.69 and 0.56mmol/g, compared to 0.45, 0.36 and 0.30mmol/g for untreated bentonite at temperatures of 25, 50 and 75°C and a pressure of 1bar, respectively. The calculated values of the thermodynamic parameters revealed that the process involving CO2 adsorption on MEA+-Mg-bentonite adsorbent was a physical, spontaneous and exothermic. Moreover, the results showed moderate and slightly high equilibrium selectivities for CO2 over CH4 on MEA+-Mg-bentonite with the values of 1.36, 4.85 and 3.43 at 25, 50 and 75°C, respectively. However, MEA+-Mg-bentonite showed equilibrium selectivity for CO2 over N2 as high as 13.79, 9.91 and 6.32 at 25, 50 and 75°C, respectively. Regenerative ability in short runs of isothermal CO2 adsorption-desorption cycles revealed that MEA+-Mg-bentonite adsorbent was able to undergo several CO2 adsorption-desorption cycles without noticeable decrease in its adsorption capacity. Clearly, amine-bentonite hybrid adsorbents are promising inexpensive materials for CO2 capture. © 2015 Elsevier B.V.
date: 2015
publisher: Elsevier Ltd
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85027922936&doi=10.1016%2fj.clay.2015.01.030&partnerID=40&md5=95d8d2a5ce3f6e25fa851504e61ddd24
id_number: 10.1016/j.clay.2015.01.030
full_text_status: none
publication: Applied Clay Science
volume: 107
pagerange: 213-219
refereed: TRUE
issn: 01691317
citation:   Elkhalifah, A.E.I. and Azmi Bustam, M. and Shariff, A.M. and Murugesan, T.  (2015) Selective adsorption of CO2 on a regenerable amine-bentonite hybrid adsorbent.  Applied Clay Science, 107.  pp. 213-219.  ISSN 01691317