DOI: 10.1016/j.jcou.2017.11.009
Scopus记录号: 2-s2.0-85036476083
论文题名: CO2 chemisorption enhancement produced by K2CO3- and Na2CO3-addition on Li2CuO2
作者: Ham-Liu I. ; Mendoza-Nieto J.A. ; Pfeiffer H.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 23 起始页码: 143
结束页码: 151
语种: 英语
英文关键词: CO2 capture
; DSC analysis
; Eutectic phase
; Lithium cuprate
; Thermogravimetric analysis
Scopus关键词: Alkalinity
; Carbon dioxide
; Carbonates
; Carbonation
; Chemisorption
; Copper compounds
; Efficiency
; Eutectics
; Isotherms
; Lithium
; Potash
; Potassium
; Sodium
; Sodium compounds
; Solid state reactions
; Thermogravimetric analysis
; Alkaline carbonates
; CO2 capture
; Cuprates
; DSC analysis
; Eutectic phase
; Isothermal conditions
; Sorption capacities
; Textural properties
; Lithium compounds
英文摘要: This work presents a proposal for enhancing CO2 capture over lithium cuprate (Li2CuO2) by alkaline carbonates addition. Lithium cuprate was synthesized via solid-state reaction. Subsequently, portions of Li2CuO2 were mechanically mixed with 10 wt% of potassium carbonate (K2CO3), sodium carbonate (Na2CO3) or equal amounts of both carbonates (5–5 wt%). All samples were characterized by several techniques and then CO2 chemisorption process was evaluated on different dynamic and isothermal conditions. The presence of K and/or Na carbonates preserves the primary properties of pristine Li2CuO2, such as crystalline phase (DRX) and microstructure (SEM), also allowing to increase textural properties (N2 physisorption) and modifying CO2 desorption abilities (TPD), in comparison with pure material. In general, carbonates addition induces some changes during CO2 chemisorption, depending on the type of carbonate used. On the isothermal tests, it was observed that between 400 and 600 °C the sample containing both carbonates presented the best capture performance, capturing between 25.7 and 31.8 wt% of CO2 (63.9–79.1% of efficiency). On the other hand, at 700 °C, Na-Li2CuO2 sample presented the best capture ability, capturing 30.6 wt% of CO2 (76.1% of efficiency). Meanwhile at 650 °C, K-Li2CuO2 presented the highest sorption capacity with 40.4 wt% of CO2 captured, which represents ∼100% of efficiency. The above results showed that in the same thermal conditions, samples modified with alkaline carbonates improved the CO2 capture process. This enhancement was attributed to the formation of eutectic phases (observed in DSC analysis) between sodium and potassium carbonates added mechanically and lithium carbonate (Li2CO3) formed as result of CO2 chemisorption process. Finally, it was observed that carbonate addition is a feasible way to increase CO2 capture in Li2CuO2 material by means of eutectic phase formation. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112003
Appears in Collections: 气候减缓与适应
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作者单位: Laboratorio de Fisicoquímica y Reactividad de Superficies (LaFReS), Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior s/n, Ciudad Universitaria, Del. Coyoacán, Ciudad de México, CP 04510, Mexico
Recommended Citation:
Ham-Liu I.,Mendoza-Nieto J.A.,Pfeiffer H.. CO2 chemisorption enhancement produced by K2CO3- and Na2CO3-addition on Li2CuO2[J]. Journal of CO2 Utilization,2018-01-01,23