Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Microwave regeneration and thermal and oxidative stability of imidazolium cyanopyrrolide ionic liquid for direct air capture of carbon dioxide

Journal Article · · ChemSusChem
 [1];  [1];  [1];  [2];  [1]; ORCiD logo [2];  [1]
  1. Case Western Reserve University, Cleveland, OH (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations

Understanding the oxidative and thermal degradation of CO2 sorbents is essential for assessing long-term sorbent stability in direct air capture (DAC). The potential degradation pathway of imidazolium cyanopyrrolide, an ionic liquid (IL) functionalized for superior CO2 capacity and selectivity, was evaluated under accelerated degradation conditions to understand the secondary reactions that can occur during repetitive absorption-desorption thermal-swing cycles. The combined analysis from various spectroscopy, chromatography, and thermal gravimetric measurements indicated that radicalic and SN2 mechanisms in degradation are encouraged by the nucleophilicity of the anion. Thickening of the liquid and gas evolution are accompanied by 50% reduction in CO2 capacity after a 7-day exposure to O2 under 80 °C. In order to prevent long exposure to conventional thermal heating, we demonstrate microwave (MW) regeneration of the CO2-reactive IL where dielectric heating at 80 and 100 °C rapidly desorbs CO2 and regenerates the IL without any measurable degradation.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); USDOE
Grant/Contract Number:
AC05-00OR22725; SC0022214; 80NSSC18K1505
OSTI ID:
1972767
Alternate ID(s):
OSTI ID: 1969831; OSTI ID: 1972769
Journal Information:
ChemSusChem, Vol. n/a, Issue n/a; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

Figures / Tables (15)

Scheme 1(p. 9)figure Scheme 1
Scheme 2(p. 10)figure Scheme 2
Table 1(p. 12)table Table 1
Figure 1(p. 14)figure Figure 1
Scheme 3(p. 16)figure Scheme 3
Scheme 4(p. 18)figure Scheme 4
Figure 2(p. 20)figure Figure 2
Figure 3(p. 22)figure Figure 3
Figure 4(p. 23)figure Figure 4
Figure 5(p. 25)figure Figure 5
Table 2(p. 26)table Table 2
Figure 6(p. 27)figure Figure 6
Figure 7(p. 30)figure Figure 7
Figure 8(p. 33)figure Figure 8
Figure 9(p. 35)figure Figure 9

Similar Records

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
carbon capture
dielectric heating
electromagnetic wave
oxidative degradation
thermal degradation