Effect of support structure on CO2 adsorption properties of pore-expanded hyperbranched aminosilicas

Handle URI:
http://hdl.handle.net/10754/598062
Title:
Effect of support structure on CO2 adsorption properties of pore-expanded hyperbranched aminosilicas
Authors:
Drese, Jeffrey H.; Choi, Sunho; Didas, Stephanie A.; Bollini, Praveen; Gray, McMahan L.; Jones, Christopher W.
Abstract:
Hyperbranched aminosilica (HAS) CO 2 adsorbents are prepared by the ring-opening polymerization of aziridine from SBA-15 mesoporous silica, as in the original synthesis of HAS materials, as well as over an array of new support materials with substantially larger average pore diameters to elucidate the effect of support porosity on final adsorbent properties. Pore-expanded hyperbranched aminosilica (PEHAS) CO 2 adsorbents are prepared from several different pore-expanded, ordered mesoporous silicas including pore-expanded SBA-15, mesocellular foam, and a large-pore commercial silica. The effect of the nature of the silica support is determined by examining the degree of aziridine polymerization and the CO 2 adsorption kinetics and capacities of the resulting organic/inorganic hybrid materials. Comparisons are made to non-pore-expanded SBA-15 based HAS adsorbents, reported previously, where pores become blocked at higher amine loadings. The PEHAS materials unexpectedly possess lower amine loadings than the previously reported HAS materials and do not exhibit pore blocking. The use of acetic acid as a catalyst during PEHAS synthesis only marginally increases amine loading. The adsorption kinetics of PEHAS adsorbents are similar to HAS adsorbents with low amine loadings and do not show the detrimental effects of pore-blocking. However, the inability to synthesize PEHAS adsorbents with high amine loadings via this approach limits the total amount of CO 2 captured per gram of material, compared to HAS adsorbents with high amine loadings. © 2011 Elsevier Inc. All rights reserved.
Citation:
Drese JH, Choi S, Didas SA, Bollini P, Gray ML, et al. (2012) Effect of support structure on CO2 adsorption properties of pore-expanded hyperbranched aminosilicas. Microporous and Mesoporous Materials 151: 231–240. Available: http://dx.doi.org/10.1016/j.micromeso.2011.10.031.
Publisher:
Elsevier BV
Journal:
Microporous and Mesoporous Materials
KAUST Grant Number:
KUS-I1-011-21
Issue Date:
Mar-2012
DOI:
10.1016/j.micromeso.2011.10.031
Type:
Article
ISSN:
1387-1811
Sponsors:
Support for this work was partially provided by Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry, as Dr. Sunho Choi is a Camille & Henry Dreyfus Environmental Chemistry Fellow. This work has also been partially supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). Partial support was also provided by the US Department of Energy, National Energy Technology Laboratory.
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Full metadata record

DC FieldValue Language
dc.contributor.authorDrese, Jeffrey H.en
dc.contributor.authorChoi, Sunhoen
dc.contributor.authorDidas, Stephanie A.en
dc.contributor.authorBollini, Praveenen
dc.contributor.authorGray, McMahan L.en
dc.contributor.authorJones, Christopher W.en
dc.date.accessioned2016-02-25T13:11:56Zen
dc.date.available2016-02-25T13:11:56Zen
dc.date.issued2012-03en
dc.identifier.citationDrese JH, Choi S, Didas SA, Bollini P, Gray ML, et al. (2012) Effect of support structure on CO2 adsorption properties of pore-expanded hyperbranched aminosilicas. Microporous and Mesoporous Materials 151: 231–240. Available: http://dx.doi.org/10.1016/j.micromeso.2011.10.031.en
dc.identifier.issn1387-1811en
dc.identifier.doi10.1016/j.micromeso.2011.10.031en
dc.identifier.urihttp://hdl.handle.net/10754/598062en
dc.description.abstractHyperbranched aminosilica (HAS) CO 2 adsorbents are prepared by the ring-opening polymerization of aziridine from SBA-15 mesoporous silica, as in the original synthesis of HAS materials, as well as over an array of new support materials with substantially larger average pore diameters to elucidate the effect of support porosity on final adsorbent properties. Pore-expanded hyperbranched aminosilica (PEHAS) CO 2 adsorbents are prepared from several different pore-expanded, ordered mesoporous silicas including pore-expanded SBA-15, mesocellular foam, and a large-pore commercial silica. The effect of the nature of the silica support is determined by examining the degree of aziridine polymerization and the CO 2 adsorption kinetics and capacities of the resulting organic/inorganic hybrid materials. Comparisons are made to non-pore-expanded SBA-15 based HAS adsorbents, reported previously, where pores become blocked at higher amine loadings. The PEHAS materials unexpectedly possess lower amine loadings than the previously reported HAS materials and do not exhibit pore blocking. The use of acetic acid as a catalyst during PEHAS synthesis only marginally increases amine loading. The adsorption kinetics of PEHAS adsorbents are similar to HAS adsorbents with low amine loadings and do not show the detrimental effects of pore-blocking. However, the inability to synthesize PEHAS adsorbents with high amine loadings via this approach limits the total amount of CO 2 captured per gram of material, compared to HAS adsorbents with high amine loadings. © 2011 Elsevier Inc. All rights reserved.en
dc.description.sponsorshipSupport for this work was partially provided by Camille and Henry Dreyfus Postdoctoral Program in Environmental Chemistry, as Dr. Sunho Choi is a Camille & Henry Dreyfus Environmental Chemistry Fellow. This work has also been partially supported by Award No. KUS-I1-011-21, made by King Abdullah University of Science and Technology (KAUST). Partial support was also provided by the US Department of Energy, National Energy Technology Laboratory.en
dc.publisherElsevier BVen
dc.subjectAdsorptionen
dc.subjectAmineen
dc.subjectCarbon captureen
dc.subjectCO 2en
dc.titleEffect of support structure on CO2 adsorption properties of pore-expanded hyperbranched aminosilicasen
dc.typeArticleen
dc.identifier.journalMicroporous and Mesoporous Materialsen
dc.contributor.institutionGeorgia Institute of Technology, Atlanta, United Statesen
dc.contributor.institutionNational Energy Technology Laboratory, Morgantown, Morgantown, United Statesen
kaust.grant.numberKUS-I1-011-21en
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