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Separation of CO 2 /CH 4 /N 2 is significantly important from the view of environmental protection and energy utilization. In this work, we reported nitrogen (N)-doped porous carbon spheres prepared from sustainable biomass glucose via hydrothermal carbonization, CO 2 activation, and urea treatment. The optimal carbon sample exhibited a high CO 2 and CH 4 capacity, as well as a low N 2 uptake, under ambient conditions. The excellent selectivities toward CO 2 /N 2 , CO 2 /CH 4 , and CH 4 /N 2 binary mixtures were predicted by ideal adsorbed solution theory (IAST) via correlating pure component adsorption isotherms with the Langmuir-Freundlich model. At 25 °C and 1 bar, the adsorption capacities for CO 2 and CH 4 were 3.03 and 1.3 mmol g -1 , respectively, and the IAST predicated selectivities for CO 2 /N 2 (15/85), CO 2 /CH 4 (10/90), and CH 4 /N 2 (30/70) reached 16.48, 7.49, and 3.76, respectively. These results should be attributed to the synergistic effect between suitable microporous structure and desirable N content. This report introduces a simple pathway to obtain N-doped porous carbon spheres to meet the flue gas and energy gas adsorptive separation requirements.

Sustainable Biomass Glucose-Derived Porous Carbon Spheres with High Nitrogen Doping: As a Promising Adsorbent for CO2/CH4/N2 Adsorptive Separation