Spherical nitrogen-containing polymer and microporous carbon materials have been synthesized by using hexamethylenetetramine as nitrogen source and one of the carbon precursors under solvothermal conditions, without using any surfactant or toxic reagent such as formaldehyde. The synthesis strategy is user-friendly, cost-effective, and can be easily scaled up for production. The microporous carbon spheres exhibit high surface areas of 528-936 m 2 g À1 with a micropore size of 0.6-1.3 nm. The synthesized microporous carbons show a good capacity to store CO 2 , which is mainly due to the presence of nitrogen-containing groups and a large amount of narrow micropores (<1.0 nm). At 1 atm, the equilibrium CO 2 capture capacities of the obtained microporous carbons are in the range of 3.9-5.6 mmol g À1 at 0 C and 2.7-4.0 mmol g À1 at 25 C.

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Nitrogen-enriched porous carbon spheres are made by a one-pot carbonization process by decorating melamine–formaldehyde with resorcinol and hexamethylenetetramine, exhibiting high CO2 capture capacities of 4.34 mmol g−1 at 25 °C and 2.76 mmol g−1 at 75 °C.

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