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Title: Design of Aminopolymer Structure to Enhance Performance and Stability of CO 2 Sorbents: Poly(propylenimine) vs Poly(ethylenimine)

Studies on aminopolymer/oxide composite materials for direct CO 2 capture from air have often focused on the prototypical poly(ethylenimine) (PEI) as the aminopolymer. But, it is known that PEI will oxidatively degrade at elevated temperatures. This degradation has been ascribed to the presence of secondary amines, which, when oxidized, lose their CO 2 capture capacity. We demonstrate the use of small molecule poly(propylenimine) (PPI) in linear and dendritic architectures supported in silica as adsorbent materials for direct CO 2 capture from air. Regardless of amine loading or aminopolymer architecture, the PPI-based sorbents are found to be more efficient for CO 2 capture than PEI-based sorbents. Moreover, PPI is found to be more resistant to oxidative degradation than PEI, even while containing secondary amines, as supported by FTIR, NMR, and ESI-MS studies. Our results suggest that PPI-based CO 2 sorbents may allow for longer sorbent working lifetimes due to an increased tolerance to sorbent regeneration conditions and suggest that the presence of secondary amines may not mean that all aminopolymers will oxidatively degrade.
Authors:
ORCiD logo [1] ;  [1] ;  [2] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Chemical and Biomolecular Engineering
  2. Global Thermostat LLC, Atlanta, GA (United States)
Publication Date:
Grant/Contract Number:
SC0012577
Type:
Published Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 139; Journal Issue: 10; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Research Org:
Georgia Inst. of Technology, Atlanta, GA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE
OSTI Identifier:
1345549
Alternate Identifier(s):
OSTI ID: 1347360