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针对甲烷气体(煤矿乏风瓦斯)的富集与分离,研究Sr改性椰壳炭在变压吸附和变温吸附过程中的性能。结果表明:1)Sr改性椰壳炭的比表面积明显减小,主要是由于Sr在椰壳炭表面的负载导致孔道堵塞和高温焙烧产生的孔道坍塌;2)在常温变压吸附测试中,Sr改性椰壳炭对CH4的吸附量急剧降低,Sr(NO3)2改性椰壳炭下降了62%,SrCO3改性椰壳炭下降了67%,分离系数也由原来的4.7分别下降至3.0和2.7;3)在程序升温脱附测试中,Sr改性椰壳炭对CH4和N2的吸附峰都减弱,但S(CH4)/S(N2)从1.0升至3.2和4.4;4)Sr改性椰壳炭适合变温吸附分离CH4/N2。
Aiming at the enrichment and separation of methane gas (coal mine gas), the properties of Sr modified coconut shell charcoal in pressure swing adsorption and temperature swing adsorption process were studied. The results showed that: 1) The specific surface area of Sr-modified coconut shell charcoal was significantly reduced, mainly due to pore blockage caused by pore plugging and high temperature calcination caused by the loading of Sr on the surface of coconut shell charcoal. 2) At atmospheric pressure swing adsorption test, Sr-modified coconut shell charcoal adsorption of CH4 decreased sharply, Sr (NO3) 2 modified coconut shell charcoal decreased by 62%, SrCO3 modified coconut shell charcoal decreased by 67%, the separation factor from the original 4.7 down to 3.0 and 2.7, respectively. 3) In the temperature programmed desorption test, the adsorption peak of CH4 and N2 on Sr-modified coconut shell charcoal decreased, but S (CH4) / S Sr modified coconut shell charcoal is suitable for temperature swing adsorption separation of CH4 / N2.