Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon

M. Al-Marri, Al-Saad Ka, Sa Ma, Cortes Dj, Khader Mm
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引用次数: 10

Abstract

A thermodynamic study of the enthalpies of adsorption of CO2 was conducted on polyethyleneimine 10k/ mesoporous silica (PEI-10k/MPS) and activated carbon (AC). These materials were chosen because of their high CO2 sorption capacities at about 85°C for PEI and about 20°C for the AC, therefore can capture CO2 with high efficiency in a wide temperature range. The absolute quantity of adsorbed CO2 as a function of equilibrium pressure at various temperatures was determined experimentally and fitted to isotherms of generalized Langmuir and Toth equations for PEI and AC, respectively. The adsorption of CO2 on PEI was favored with temperature revealing the endothermic nature of the process. On the other hand, CO2 adsorption on the AC was exothermic. The isosteric enthalpy of adsorption on PEI was about constant with CO2 loading at a value of 93 kJ.mol-1, confirming its chemical nature and corroboration with the Langmuir model. The corresponding isosteric enthalpy of the AC was in the range of ~-25 kJ.mol-1 and was continuously decreasing with CO2 loading; confirming the physisorption nature of the process and also that CO2/ CO2 interactions within the adsorption layer was significant.
聚乙烯亚胺介孔二氧化硅和活性炭吸附CO2的热力学研究
对聚乙烯亚胺10k/介孔二氧化硅(PEI-10k/MPS)和活性炭(AC)对CO2的吸附焓进行了热力学研究。选择这些材料是因为它们在约85°C的PEI和约20°C的AC下具有较高的CO2吸附能力,因此可以在很宽的温度范围内高效捕获CO2。实验确定了不同温度下吸附CO2的绝对数量作为平衡压力的函数,并分别拟合到PEI和AC的广义Langmuir和Toth方程的等温线上。温度对CO2在PEI上的吸附有利,表明该过程具有吸热性质。另一方面,CO2在活性炭上的吸附是放热的。当CO2负荷为93 kJ时,PEI吸附的等构焓基本不变。证实了它的化学性质,并与Langmuir模型相印证。AC的等容焓在~- 25kj范围内。mol-1,随CO2负荷的增加而不断降低;证实了该过程的物理吸附性质,也证实了吸附层内CO2/ CO2的相互作用是显著的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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