Abstract：In order to efficiently separate CO₂from coalbed gas so as to improve the ignition capacity and utilize the gas, a carbon material with high adsorption performance and high separation performance for CO₂/CH₄was prepared by means of carbonized organic salt, nitrogen doping method. With scanning electron microscopy ( SET) and transmission electron microscopy ( TEM) , N-doped carbon materials have developed pore structures, such as Desert Rose. The resulting materials have a high BET surface areas up to 937 ~ 1 373 m²·g^-1, and have rich pore volumes of 0. 43 ~ 0. 62 m³·g^-1. In this study, it was found that the presence of abundant N-groups enhances the CO₂adsorption performance of these materials, the selective adsorption of CO₂/CH₄was improved from 2. 74 times up to 5. 26 times, and separation factor was improved from 3. 82 up to 7. 81. The carbon material prepared by this method has a broad application prospect in the separating CO₂from gas, which can improve the gas ignition ability and gas utilization efficiency.

Keyword：porous carbon;coalbed gas;selective adsorption;CO2/CH4;separation property;