Influence of temperature and high-pressure on the adsorption behavior of scCO2 on MCM-41 and SBA-15
| Autor: | Michael Türk, Sarah Reiser |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Precipitation (chemistry) General Chemical Engineering Substrate (chemistry) Thermodynamics 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Supercritical fluid 0104 chemical sciences symbols.namesake Gibbs isotherm Adsorption Clausius–Clapeyron relation MCM-41 symbols Molecule Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | The Journal of Supercritical Fluids. 144:122-133 |
| ISSN: | 0896-8446 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect