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In-situ preparation of nitrogen-doped unimodal ultramicropore carbon nanosheets with ultrahigh gas selectivity

Fu, Ning, Yu, Jing, Zhao, Jing, Liu, Rui, Li, Feng, Du, Yuchuan, Yang, Zhenglong
Carbon 2019 v.149 pp. 538-545
adsorbents, carbon, carbon dioxide, cobalt, ethane, nanosheets, nitrogen, nitrogen content, propane, surface area, synergism
The development of simple and feasible methods to synthesize highly efficient adsorbents is the key to low-cost gas purification. Here we developed an in-situ amorphous cobalt template method based on the synergistic effect of precursor to synthesize nitrogen doped unimodal ultramicropores carbon nanosheets Co-NDPCs with high nitrogen content (up to 11.74%), large specific surface area (up to 1187 m2 g−1) and unimodal ultramicropore. As an adsorbent, the Co-NDPCs exhibit unprecedented C2H2, C2H6, C3H8 and CO2 uptake capacities of 6.7, 5.9, 7.4 and 5.6 mmol g−1, respectively, and the corresponding x/CH4 and CO2/N2 IAST selectivities are as high as 75.3, 65.9.1743.6, 11.4 and 74.7 at 298 K and 1 bar. More importantly, this method effectively avoids the defects of traditional activation or template method, such as corrosiveness, poor safety and complicated process, indicating that Co-NDPCs is a promising adsorbent for CH4/C2H2/C2H6/C3H8/CO2/N2 capture and separation.