摘要：

Shaped active carbon adsorbents using bituminous coal from Chonqing mine as raw material for concentrating methane from CH4/N2 mixtures were prepared by taking carbonization-activation-deposition process and the effect of the preparation conditions on the pressure swing adsorption(PSA) concentrating performance was studied.The micro-structure characterization of active carbon was investigated by low temperature liquid nitrogen adsorption method.Experimental results showed that the methane concentration had increased 20.0vol% at the vacuum stage of PSA process with five steps using the shaped active carbon prepared as absorbent.As for one of the shaped active carbon adsorbents which concentrating effect was 20vol%,its BET specific surface area was 580m2/g,total micropore volume was 0.14cm3/g and its pore diameter size distribution was mostly between 2.0 and 4.0nm.

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