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首页> 外文期刊>Environmental Science & Technology >Studies On Selective Adsorption Of Biogas Components On Pillared Clays: Approach For Biogas Improvement
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Studies On Selective Adsorption Of Biogas Components On Pillared Clays: Approach For Biogas Improvement

机译：柱状粘土对沼气成分的选择性吸附研究：改善沼气的方法

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摘要

Comparative adsorptions of four gases (natural gas and landfill gas components), viz., CO_2, CH_4, C_2H_6, and N_2, were studied on four different pillared clays (PILCs) to develop a selective material. Such material could be usefulforthe separation/ purification process of waste gases. These materials (PILCs) were prepared from two different natural montmorillonite clays, by pillaring with Al_2O_3 and ZrO_2, separately and were characterized by means of nitrogen adsorption and XRD. The adsorption isotherms for pure component gases were determined for each PILC, up to 10~3 kPa. The isotherms data were explored to calculate the selectivity of PILCs for either gas in any binary mixture. It was observed that the surface area of the clays pillared with Al_2O_3 was higher than that of the clays pillared with ZrO_2. At the highest studied equilibrium pressure, the order of maximum adsorption was found to be CO_2 > C_2H_6 > CH_4 > N_2 for each material. With the help of adsorption modeling, the selective adsorption from binary mixtures was predicted at different equilibrium pressures and compositions. Among the four PILCs, a ZrO_2 PILC was found to be the most suitable material, in terms of separation possibility. To further assess the efficiency of these materials in commercial processes, the adsorption capacity in terms of working capacity was also calculated at two different regeneration pressures, i.e., at 1.0 atm and 1.0 Torr.
机译：研究了四种气体（天然气和垃圾填埋气体成分），即CO_2，CH_4，C_2H_6和N_2在四种不同的柱状粘土（PILC）上的比较吸附，以开发选择性材料。这种材料可用于废气的分离/纯化过程。这些材料（PILC）是由两种不同的天然蒙脱土粘土分别用Al_2O_3和ZrO_2柱撑制得的，并通过氮吸附和XRD表征。对于每个PILC，确定了最高10〜3 kPa的纯组分气体的吸附等温线。探索了等温线数据以计算PILC对任何二元混合物中任一气体的选择性。观察到，以Al_2O_3柱撑的粘土的表面积比以ZrO_2柱撑的粘土的表面积大。在研究的最高平衡压力下，发现每种材料的最大吸附顺序为CO_2> C_2H_6> CH_4> N_2。借助吸附模型，预测了在不同平衡压力和组成下二元混合物的选择性吸附。在四个PILC中，就分离可能性而言，发现ZrO_2 PILC是最合适的材料。为了进一步评估这些材料在商业过程中的效率，还在两个不同的再生压力下，即在1.0atm和1.0Torr下，计算了根据工作能力的吸附能力。

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