Porous covalent triazine polymer networks (PCTPs) with BET surface areas of 1200 and 523 m(2) g(-1), respectively, were prepared via a single step Friedel-Crafts reaction of cyanuric chloride with tetra-reactive 1,1,2,2-tetraphenylethylene (PCTP-1) or tetraphenylsilane (PCTP-2). PCTP-1 exhibited a high CO2 uptake capacity of up to 216.5 mg g(-1) at 273 K/1 bar with an isosteric heat of adsorption of 44.5-22.6 kJ mol(-1), whereas PCTP-2 showed somewhat less CO2 adsorption (152 mg g(-1) at 273 K/1 bar) and a lower heat of adsorption (30.2-7.4 kJ mol(-1)) due to the lower amount of nitrogen incorporated within the structure. Both PCTP networks showed significantly enhanced CO2/N-2 selectivity compared to the same analogues with similar networks. Eight consecutive CO2 adsorption-desorption cycles of both PCTPs confirmed the high stability and reversibility of the networks. PCTP-1 also exhibited a significantly high CO2 storage capacity of 528 mg g(-1) at 300 K/35 bar with high CO2/CH4 selectivity. The excellent performance of the CO2 uptakes and the inexpensive synthesis of PCTP-1 are promising for CO2 adsorption and separation. (C) 2015 Elsevier B.V. All rights reserved.