Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Underlying Roles of Polyol Additives in Promoting CO2 Capture in PEI/Silica Adsorbents

Journal Article · · ChemSusChem

Solid-supported amines having low molecular weight branched poly(ethylenimine) (PEI) physically impregnated into porous solid supports are promising adsorbents for CO2 capture. Co-impregnating short-chain poly(ethylene glycol) (PEG) together with PEI alters the performance of the adsorbent, delivering improved amine efficiency (AE, mol CO2 sorbed / mol N) and faster CO2 uptake rates. To uncover the physical basis for this improved gas capture performance, we probed the distribution and mobility of the polymers in the pores via small angle neutron scattering (SANS), solid-state NMR, and molecular dynamic (MD) simulation studies. SANS and MD simulations reveal that PEG displaces wall-bound PEI, making amines more accessible for CO2 sorption. Solid-state NMR and MD simulation suggest intercalation of PEG into PEI domains, separating PEI domains and reducing amine-amine interactions, providing potential PEG-rich and amine-poor interfacial domains that bind CO2 weakly via physisorption while providing facile pathways for CO2 diffusion. Contrary to a prior literature hypothesis, no evidence is obtained for PEG facilitating PEI mobility in solid supports. Instead, the data suggest that PEG chains coordinate to PEI, form larger bodies with reduced mobility compared to PEI alone. We also demonstrate promising CO2 uptake and desorption kinetics at varied temperatures, given by favorable amine distribution.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; SC0012577
OSTI ID:
2376352
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 22 Vol. 17; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

References (62)

Synthesis–Structure–Property Relationships for Hyperbranched Aminosilica CO 2 Adsorbents journal December 2009
Mixed Diethanolamine and Polyethyleneimine with Enhanced CO2 Capture Capacity from Air journal April 2023
In Situ Infrared Study of the Role of PEG in Stabilizing Silica-Supported Amines for CO2 Capture journal August 2010
Amine-Tethered Solid Adsorbents Coupling High Adsorption Capacity and Regenerability for CO2 Capture From Ambient Air journal May 2011
Spectroscopic Investigation into Oxidative Degradation of Silica-Supported Amine Sorbents for CO2 Capture journal June 2012
Mixed Alkanolamine-Polyethylenimine Functionalized Silica for CO 2 capture journal December 2018
Development and testing of a general amber force field journal January 2004
PACKMOL: A package for building initial configurations for molecular dynamics simulations journal October 2009
The reaction between anhydrous ethyleneimine and water journal December 1963
Probing the solvation shell of organic molecules by intermolecular 1H NOESY journal November 2002
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Effect of graphene nanoplatelets as nanofiller in plasticized poly(lactic acid) nanocomposites journal August 2014
Amine-based sorbents for CO2 capture from air and flue gas—a short review and perspective journal January 2023
Research needs targeting direct air capture of carbon dioxide: Material & process performance characteristics under realistic environmental conditions journal January 2022
The reaction of CO2 with ethanolamines journal January 1979
Comparison of ammonia and monoethanolamine solvents to reduce CO2 greenhouse gas emissions journal April 1999
Preparation and characterization of novel CO2 “molecular basket” adsorbents based on polymer-modified mesoporous molecular sieve MCM-41 journal August 2003
In vitro and in vivo complement activation and related anaphylactic effects associated with polyethylenimine and polyethylenimine-graft-poly(ethylene glycol) block copolymers journal July 2011
Implementing molecular dynamics on hybrid high performance computers – short range forces journal April 2011
Poly(vinylalcohol)/poly(ethyleneglycol)/poly(ethyleneimine) blend membranes - structure and CO2 facilitated transport journal March 2010
CO2 capture over molecular basket sorbents: Effects of SiO2 supports and PEG additive journal September 2017
Dual-functional interconnected pebble-like structures in highly crystalline poly(ethylene oxide) membranes for CO2 separation journal May 2021
Direct Capture of CO2 from Ambient Air journal August 2016
Enhancing Degradation Resistance of Polyethylenimine for CO 2 Capture with Cross-Linked Poly(vinyl alcohol) journal November 2017
On the Behavior of the Ethylene Glycol Components of Polydisperse Polyethylene Glycol PEG200 journal January 2023
Aminopolymer Mobility and Support Interactions in Silica-PEI Composites for CO 2 Capture Applications: A Quasielastic Neutron Scattering Study journal June 2017
Probing the Morphology and Mobility of Amines in Porous Silica CO2 Sorbents by 1H T1T2 Relaxation Correlation NMR journal June 2023
Fundamental Insight into Humid CO2 Uptake in Direct Air Capture Nanocomposites Using Fluorescence and Portable NMR Relaxometry journal July 2023
Methane Adsorption in Model Mesoporous Material, SBA-15, Studied by Small-Angle Neutron Scattering journal February 2016
Control of CO 2 Adsorption and Desorption Using Polyethylene Glycol in a Tetraethylenepentamine Thin Film: An In Situ ATR and Theoretical Study journal October 2016
Unraveling the Dynamics of Aminopolymer/Silica Composites journal March 2016
Linking Silica Support Morphology to the Dynamics of Aminopolymers in Composites journal May 2017
Role of Additives in Composite PEI/Oxide CO 2 Adsorbents: Enhancement in the Amine Efficiency of Supported PEI by PEG in CO 2 Capture from Simulated Ambient Air journal November 2015
Structures of Partially Fluorinated Bottlebrush Polymers in Thin Films journal December 2019
Polyethylene Glycol (PEG) Addition to Polyethylenimine (PEI)-Impregnated Silica Increases Amine Accessibility during CO 2 Sorption journal August 2019
In Situ ATR and DRIFTS Studies of the Nature of Adsorbed CO 2 on Tetraethylenepentamine Films
  • Wilfong, Walter Christopher; Srikanth, Chakravartula S.; Chuang, Steven S. C.
  • ACS Applied Materials & Interfaces, Vol. 6, Issue 16 https://doi.org/10.1021/am5031006
journal August 2014
Star-Shaped Poly(ethylene glycol)-block-polyethylenimine Copolymers Enhance DNA Condensation of Low Molecular Weight Polyethylenimines journal August 2002
Force Field and a Surface Model Database for Silica to Simulate Interfacial Properties in Atomic Resolution journal April 2014
Effect of the Pore Length on CO 2 Adsorption over Amine-Modified Mesoporous Silicas journal September 2011
Mesoporous Alumina-Supported Amines as Potential Steam-Stable Adsorbents for Capturing CO 2 from Simulated Flue Gas and Ambient Air journal November 2011
Mechanisms and kinetics of diethanolamine degradation journal May 1985
Carbon Dioxide Reaction Kinetics and Transport in Aqueous Amine Membranes journal August 1980
Applications of Pore-Expanded Mesoporous Silicas. 3. Triamine Silane Grafting for Enhanced CO 2 Adsorption journal April 2006
New Insights into the Interactions of CO 2 with Amine-Functionalized Silica journal December 2008
Kinetics of carbamate formation and breakdown journal November 1968
Designing Adsorbents for CO 2 Capture from Flue Gas-Hyperbranched Aminosilicas Capable of Capturing CO 2 Reversibly journal March 2008
Understanding the Impacts of Support–Polymer Interactions on the Dynamics of Poly(ethyleneimine) Confined in Mesoporous SBA-15 journal June 2022
Support Pore Structure and Composition Strongly Influence the Direct Air Capture of CO2 on Supported Amines journal March 2023
Linking CO 2 Sorption Performance to Polymer Morphology in Aminopolymer/Silica Composites through Neutron Scattering journal September 2015
Sub-Ambient Temperature Direct Air Capture of CO2 using Amine-Impregnated MIL-101(Cr) Enables Ambient Temperature CO2 Recovery journal February 2022
The Polymerization of Ethylenimine journal March 1944
Characterization of Micro- and Mesoporosity in SBA-15 Materials from Adsorption Data by the NLDFT Method journal July 2001
Effect of Amine Surface Coverage on the Co-Adsorption of CO 2 and Water: Spectral Deconvolution of Adsorbed Species journal November 2014
Origin of the scattering peak in microemulsions journal September 1987
Advances in the Chemistry of Polyethyleneimine (Polyaziridine) journal July 1965
Incorporation and structural arrangement of microemulsion droplets in cylindrical pores of mesoporous silica journal April 2021
Relaxation Effects in Nuclear Magnetic Resonance Absorption journal April 1948
Surface relaxation and chemical exchange in hydrating cement pastes: A two-dimensional NMR relaxation study journal July 2005
The suite of small-angle neutron scattering instruments at Oak Ridge National Laboratory journal February 2018
Effect of Glass‐Transition Temperature of Polyethylene Glycol‐Plasticized Polyvinyl Alcohol on Granule Compaction journal April 1984
Avogadro: an advanced semantic chemical editor, visualization, and analysis platform journal August 2012
Computer Simulation Using Particles book January 1988