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以褐煤为原料,分别采用煤焦油、可溶淀粉和聚丙烯酰胺(PAM)作粘结剂,制备了用于变压吸附(PSA)分离CH_4和N_2混合气体(CH_4/N_2)的三种颗粒活性炭GAC C、GAC-T和GAC-P,对样品的表面官能团和孔结构进行表征,研究了粘结剂对活性炭PSA分离CH_4/N_2性能的影响。结果表明:粘结剂的种类和用量对样品分离效果影响较大,GAC-T的PSA分离CH_4/N_2的性能最好。粘结剂用量(粘结剂与煤粉的质量比)为0.15-0.20时,GAC-T可将CH_4浓缩28%左右;GAC-C、GAC-T和GAC-P表面含氧官能团含量的关系排序为GAC-T>GAC-C>GAC-P,而三者的孔结构范围则为10-30 nm、2-10 nm和0.4-2 nm,相差较大;样品碱性表面含氧官能团的含量越高越有利于CH_4/N_2的PSA分离;CH_4/N_2分离效果受微孔的影响较大,0.4-0.7 nm的微孔是造成GAC-C、GAC-T和GAC-P分离效果差异的主要因素。
Using lignite as raw material, coal tar, soluble starch and polyacrylamide (PAM) were used as binders to prepare three kinds of particles for pressure swing adsorption (PSA) separation of CH_4 and N_2 mixed gas (CH_4 / N_2) The surface functional groups and pore structure of the samples were characterized by GAC C, GAC-T and GAC-P. The effect of binder on the separation of CH 4 / N 2 by PSA was investigated. The results showed that the type and amount of binder had great influence on the separation efficiency of samples, and the performance of PSA separation of CH_4 / N_2 by GAC-T was the best. GAC-T concentrates about 28% of CH 4 by the amount of binder (mass ratio of binder to pulverized coal) of 0.15-0.20. The relationship between the contents of oxygen-containing functional groups on the surface of GAC-C, GAC-T and GAC-P The order of the pore structure is GAC-T> GAC-C> GAC-P, while the pore structure ranges of the three are 10-30 nm, 2-10 nm and 0.4-2 nm, The higher the content, the better the separation of CH_4 / N_2 from PSA. The separation effect of CH_4 / N_2 is more affected by micropores. The separation of GAC-C, GAC-T and GAC- major factor.