The goal of this research was to study the efficiency of the silica-modified, highly selective synthesized carbon molecular sieves for nitrogen separation in the methane purification process. For this purpose, carbon molecular sieves obtained from pistachio and walnut shells were impregnated in their raw form by means of phosphoric acid as an activator agent, and then cured with nano silica with different percentages. Calculations pointed out that impregnation ratio of activator agent and SiO₂ concentration were influential on the adsorption rate and obviously has prevented the methane to get adsorbed. Maximum nitrogen adsorption was 8.8093 mM.g⁻¹ which was the value related to the walnut shell sample with an impregnation ratio of 2:1 and SiO₂ concentration equal to 1 w/w%, while minimum methane adsorption was observed to be 2.0129 mM.g⁻¹ which was the value related to the pistachio-walnut shells mixed sample with an impregnation ratio equal to 4:1 and SiO₂ concentration equal to 4 w/w%. The void volume of the micropores obtained from nitrogen adsorption was more than from methane. The walnut shell sample with an impregnation ratio of 4:1 demonstrated the highest selectivity equal to 2.1030 and was reported as the most proper sample in this study.

这项研究的目的是研究甲烷改性的高选择性合成碳分子筛在甲烷纯化过程中用于氮分离的效率。为此，将开心果壳和胡桃壳中的碳分子筛以其原始形式通过磷酸作为活化剂进行浸渍，然后用不同百分比的纳米二氧化硅进行固化。计算结果表明，活化剂的浸渍率和SiO _2的浓度对吸附速率有影响，显然阻止了甲烷的吸附。最大氮吸附量为8.8093 mM.g ^-1，这是与2：1的浸渍比和SiO ₂的核桃壳样品有关的值浓度等于1 w / w％，而最低的甲烷吸附量为2.0129 mM.g ^-1，这是与浸渍比等于4：1和SiO ₂浓度等于的开心果-胡桃壳混合样品有关的值至4 w / w％。通过氮吸附获得的微孔的空隙体积大于从甲烷获得的微孔的空隙体积。浸渍比为4：1的核桃壳样品显示出最高的选择性，等于2.1030，据报道是本研究中最合适的样品。