期刊
JOURNAL OF CO2 UTILIZATION
卷 29, 期 -, 页码 146-155出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2018.12.005
关键词
Pollen-derived porous carbon; Carbon dioxide adsorption; KOH activation; Textural property; Surface chemistry
资金
- National Research Foundation of Korea (NRF) through the Basic Science Research Program - Korean government's Ministry of Education [NRF-2018R1D1A1B07050321]
- C1 Gas Refinery Program - Korean government's Ministry of Science and ICT [NRF-2018M3D3A1A01055761]
- National Research Foundation of Korea [2018M3D3A1A01055761] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Novel microporous carbons were prepared from bee-collected pollens through carbonization and KOH activation. In the activation, various mass ratios of KOH/carbonized pollen from 1:3 to 3:1 were tested, and their effect on the physicochemical properties and CO2 adsorption performance was analyzed. As the KOH amount increased, the specific surface area and total pore volume increased because of the development of micropores during activation. Among the developed porous carbons, the sample activated with a high ratio (3:1) of KOH/carbonized pollen showed the highest CO2 adsorption uptake at 1 bar. However, the sample activated with a KOH/carbonized pollen mass ratio of 1:1 exhibited the highest CO2 adsorption uptake at 0.15 bar owing to different micropore distributions and nitrogen contents originating from the pollen precursor. Because narrower micropores are more important in the low-pressure region, cumulative pore volumes with pore sizes of less than 0.6 and 0.8 nm were well correlated with the CO2 adsorption uptake at 0.15 and 1 bar, respectively. Further, samples with residual nitrogen content showed high CO2/N-2 selectivity. The developed microporous carbons also showed excellent adsorption-desorption cyclic stability during regeneration by simple N-2 purging or by temperature-swing operation.
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