Synthesis of a nitrogen-doped porous carbon monolith and its use for CO2 capture
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摘要: 以甲醛(F)和间苯二酚(R)为炭源，赖氨酸为催化剂，采用快速溶胶凝胶法所制含氮多孔炭(RFL)对CO2具有较高的吸附能力；为增加RFL的氮含量，引入适量的三聚氰胺(M)，制得的多孔炭(RFLM)含N量增加，比表面积和孔体积也有所增加；在合成体系中进一步引入谷氨酸(G)，可使聚合反应速率得到控制，且多孔炭(RFLMG)的织构性质也得到进一步优化。RFLM和RFLMG对CO2的吸附能力较RFL弱，说明多孔炭的含N量与其对CO2的吸附能力没有明确的线性关系，而含氮官能团的存在形式会影响多孔炭对CO2的吸附能力。Abstract: Monolithic nitrogen-doped porous carbon was synthesized by the copolymerization of resorcinol and formaldehyde in the presence of L-lysine as the catalyst at the ambient conditions. The carbon is designated RFL. In order to increase the active nitrogen content, nitrogen-rich melamine was added, and the resulting material (RFLM) has more nitrogen-containing functional groups, and a higher specific surface area and pore volume than the original RFL. Glutamic acid was used to control the rate of polymerization, resulting in a porous carbon (RFLMG) with optimized texture properties. However, samples of RFLM and RFLMG show lower CO2 adsorption capacities than do the RFL series, indicating that there is no explicit linear relationship between the nitrogen content and CO2 adsorption capacity. This may be directly caused by the different form of the nitrogen-containing functional groups.
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