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Microporous carbon having Brunauer-Emmett-Teller (BET) surface area of 2186 m² g⁻¹ and micropore volume of 0.85 cm³ g⁻¹ has been synthesized via KOH induced high temperature carbonization of a non-conjugated hypercrosslinked organic polymer. Owing to the templating and activation by KOH, we have succeeded in making a microporous carbon from this porous polymer and the resultant carbon material showed high uptake for CO₂ (7.6 mmol g⁻¹) and CH₄ (2.4 mmol g⁻¹) at 1 atm, 273 K together with very good selectivity for the CO₂/N₂ (30.2) separation. Furthermore, low pressure (1 atm) H₂ (2.6 wt%, 77 K) and water uptake (57.4 wt%, 298 K) ability of this polymer derived porous activated carbon is noteworthy.