Effect of Storage Conditions on Efficacy of Poly(ethylenimine)-Alumina CO2 Sorbents
[2];
[5];
[1];
[1]
- Georgia Institute of Technology, Atlanta, GA (United States)
- Georgia Institute of Technology, Atlanta, GA (United States); Evonik, Trexlertown, PA (United States)
- Georgia Institute of Technology, Atlanta, GA (United States); Columbia University, New York, NY (United States)
- Georgia Institute of Technology, Atlanta, GA (United States); University of Texas at Austin, TX (United States)
- Georgia Institute of Technology, Atlanta, GA (United States); University of Delaware, Newark, DE (United States)
Solid amine sorbents are one of the primary components of DAC technologies that allow for the removal of ultradilute CO2 from the atmosphere. A main drawback in the implementation of solid amine sorbents in industrial-scale DAC applications is their instability under certain operational or storage conditions over an extended period. In this work, the effect of storage temperature and gas composition in the storage headspace on the long-term stability of a poly(ethylenimine)-alumina (PEI/γ-Al2O3) sorbent is explored. PEI/γ-Al2O3 sorbents with 70 and 100% pore filling are aged under varying gases (N2, O2, Ar, 0.04% CO2−N2, CO2, and ambient air) in an oven (40 °C), at common ambient indoor temperature conditions (23 °C), or in a freezer (−4 °C). The CO2 sorption capacity, as measured by thermogravimetric analysis (TGA), along with FTIR spectra of the fresh and aged sorbents, reveal that at 23 and −4 °C, storage under ambient air or inert gas (Ar) provides reasonable long-term stability, with <13% degradation over 12 and 5 months of storage. Interestingly, with storage at 40 °C, similar levels of deactivation were observed under pure O2 and N2 after 4 months of storage, which suggests that nonoxidative thermal reactions can occur under prolonged storage conditions under N2. In contrast, with storage under CO2, sorbent degradation is substantially suppressed compared to storage under N2, ambient air, O2, or Ar, yielding sorbents with no observable loss in capacity after 2 months, compared to a 66, 63, and 62% loss under N2, ambient air, and N2 in the same period at 40 °C, respectively. Overall, these findings provide guidance for practical amine sorbent storage in academic or industrial settings where amine sorbents are used for carbon capture.
- Research Organization:
- Georgia Tech Research Corp., Atlanta, GA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012577
- OSTI ID:
- 3021501
- Journal Information:
- ACS Omega, Journal Name: ACS Omega Journal Issue: 8 Vol. 11; ISSN 2470-1343
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Role of Polymer Architecture in CO2 Capture from Air Using Supported Poly(alkylenimine)s: Linear vs Branched Polymers
Spectroscopic Investigation of the Mechanisms Responsible for the Superior Stability of Hybrid Class 1/Class 2 CO2 Sorbents: A New Class 4 Category