Influence of temperature and high-pressure on the adsorption behavior of scCO2 on MCM-41 and SBA-15

被引:19
作者
Reiser, Sarah [1 ]
Tuerk, Michael [1 ]
机构
[1] KIT, Inst Tech Thermodynam & Refrigerat, Engler Bunte Ring 21, D-76131 Karlsruhe, Germany
关键词
Adsorption; CO2; Mesoporous silica; High pressure; Isosteric heat; SUPERCRITICAL CARBON-DIOXIDE; DISSOLUTION BEHAVIOR; PHYSICAL ADSORPTION; MESOPOROUS SILICAS; CARRIER MATERIALS; RAPID EXPANSION; CO2; METHANE; DEPOSITION; NITROGEN;
D O I
10.1016/j.supflu.2018.10.011
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Actually there is a growing interest in various so-called adsorption precipitation processes. Thereby, an organic molecule is dissolved in supercritical CO2, followed by the adsorption of the molecule onto a substrate (e.g. MCM-41, SBA-15) and subsequent solute precipitation due to pressure decrease. For the design of such processes it is essential to understand the complex nature of the multicomponent adsorption behavior. Thus as a first step, there is a need for studying the adsorption behavior of the particular CO2-substrate system at the respective process conditions. Due to a lack of experimental data adsorption isotherms of CO2 on MCM-41 and SBA-15 were measured at temperatures from T = 298 to 353 K and pressures up to p = 25 MPa. Based on these results, the absolute amount adsorbed was calculated from the surface excess amount. Finally, the isosteric heat of adsorption for CO2 was calculated by using the Clausius - Clapeyron equation.
引用
收藏
页码:122 / 133
页数:12
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