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Title: CO2-H2O capture and cyclability on sodium cobaltate at low temperatures (30-80 ºC); experimental and theoretical analysis

Journal Article · · Energy Technology
 [1];  [2];  [1]
  1. Univ. Nacional Autonoma de Mexico, Ciudad de Mexico (Mexico)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)
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Sodium cobaltate (NaCoO2) was analyzed for CO2 cyclic carbonation-decarbonation process at low temperatures (30–80 ºC) with relative humidity (RH) values between 0 and 80 %, using water vapor as catalytic intermediate. The presence of H2O clearly enhanced the CO2 capture at T < 100 °C, compared to dry conditions, where the amount of CO2 captured increased as a function of relative humidity. These improvements were attributed to NaHCO3 and Na2CO3 formation during carbonation. In the NaHCO3 case, water vapor becomes part of carbonation, favoring reactivity. After the carbonation analysis, decarbonation process was analyzed using a N2 flow, where results evidenced that only NaHCO3 decomposition took place at low temperatures, producing NaOH and CO2. This result indicates that NaCoO2 can be partially regenerated, suggesting a possible CO2 cyclic carbonation. CO2 carbonation–decarbonation tests were performed, confirming cyclic capacity and stability. Moreover, NaCoO2 sample was modified adding different transition metals (Fe, Cu and Ni), trying to improve CO2-H2O sorption under similar physicochemical conditions. Results indicated that Fe-containing samples presented the best properties. Lastly, CO2 partial pressure effect was analyzed on NaCoO2 and Fe-containing samples using similar relative humidities.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
Sponsoring Organization:
USDOE
OSTI ID:
1471383
Report Number(s):
NETL-PUB-21759
Journal Information:
Energy Technology, Vol. 7, Issue 3; ISSN 2194-4288
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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Cited By (1)

Ab initio investigation of the atomistic descriptors in the activation of small molecules on 3 d transition-metal 13-atom clusters: The example of H 2 , CO, H 2 O, and CO 2 journal December 2019

Figures / Tables (15)

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