A new choice of polymer precursor for solvent-free method: Preparation of N-enriched porous carbons for highly selective CO2 capture

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2019-01, Vol.355, p.963-973
• Main Authors: Zhang, Peixin, Zhong, Yao, Ding, Jian, Wang, Jun, Xu, Mai, Deng, Qiang, Zeng, Zheling, Deng, Shuguang
• Format: Article
• Language: English
• Subjects: Biogas upgrading; CO2 capture; IAST selectivity; N-doped porous carbon; Solvent-free method
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2018.08.219

This work presents a facile and efficient one-pot melting-assisted and solvent-free method to prepare low-cost N-rich polymer SFRH. Furthermore, the polymer derived N-enriched porous carbon could be used for highly selective mixed-gas separation, CO2 storage and PSA. [Display omitted] •Facile one-pot and solvent-free method to preparation.•N-doped porous carbons.•Outstanding gas mixture selectivity.•Excellent pressure/vacuum swing adsorption (P/VSA) working capacity.•10-fold scaled up production. A facile one-pot melting-assisted and solvent-free method was successfully developed for the first time for preparing nitrogen-containing polymers. Followed by activation at temperatures ranging from 600 to 800 °C led to the formation of N-rich microporous carbons possessing narrow pore size distribution (ca. 0.5–3 nm), high specific surface area (ca. 1021.4–3657.0 m2 g−1), large pore volume (ca. 0.43–2.00 cm3 g−1) and high nitrogen content (ca. up to 5.11 wt%). Particularly, the porous carbons exhibited outstanding CO2 adsorption capacity of 2.65 and 7.38 mmol g−1 at 273 K and 0.15 and 1 bar, respectively; meanwhile, it also exhibited extremely large CO2 storage capacity of 22.06 mmol g−1 at 298 K and 20 bar. Moreover, the outstanding CO2/N2, CO2/CH4 and CH4/N2 selectivity up to 36.5, 6.9 and 5.1 at 298 K and 1 bar were achieved. The determinant factors on CO2 capture at 0.15, 1 and 20 bar were carefully investigated. Furthermore, this method could be 10-fold scaled up to produce almost identical high-performance carbons. For real-world applications, pressure/vacuum swing adsorption (P/VSA) working capacity, gas-mixture transit breakthrough experiment, and recycle feasibility are evaluated. Thus, these novel materials are promising candidates for CO2 capture from dilute gas mixtures.