Keywords: Silicon oxycarbide; Specific surface area; Porous material; Pore former; Template; Molecular level removal; D4H; 2,4,6,8-tetramethylcyclotetrasiloxane; DVB; divinylbenzene; HMMH; 1,1,3,3-tetramethyldisiloxane; NLDFT; non-linear density functional theory;