甲烷在特制活性炭上吸附性能

Methane Adsorption on Specially Prepared Active Carbons Under Pressure

用不同的原料制得了多种高比表面的活性炭吸附剂．用标准容积法测得高压下（０～５０ＭＰａ）不同活性炭对甲烷的吸脱附等温线，得到了吸附容量和有效吸附容量．研究了温度对吸附等温线的影响．利用ＣｌａｕｓｉｕｓＣｌａｐｅｙｒｏｎ方程解析了甲烷在活性炭上的等量吸附热．结果表明，活性炭对甲烷的吸脱附存在着滞后现象，活性炭的比表面和堆密度是活性炭吸附性能的主要指标，找到了最佳甲烷吸附剂．

Active carbons with high adsorbability have been prepared from different raw materials by 3 activation methods: cyclic activation and activation with KOH or ZnCl2 solution. Product CA58# obtained from carbonized copra shell after 58 cyclic activations showed the best property: porosize distribution 0.82.0 nm, packing density 0.5410 g/mL, specific surface 2759 m2/g, effective absorbance 81.3 mg/g. (cyclic activation at 0.13.7 MPa). The effect of temperature on the adsorption isotherms of active carbon towards methane at pressure ranged from 0 to 50 MPa has been investigated. A hysteresis was observed on the adsorption and desorption isotherms. The specific surface and packing density are considered to be the most important characters for the adsorbent.