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Gewählte Master / Diploma Thesis:

Thomas Christian Moscher (2018): Versuche zur Messung der Adsorptionsgleichgewichte von CO2 und H2O in einer Wirbelschicht-TGA.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 64. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
The reduction of anthropogenic greenhouse gas emissions is one of the major challenges of this century. CO2 capture and storage (CCS) technology can play a relevant role in short and medium term emission avoidance. The most commonly used technology is the post-combustion capture process by chemical absorption of CO2 using aqueous amine solutions. However, this process is offset by relatively high CO2 capture costs. Among other things, energy is required for solvent regeneration and a considerable cost is expected due to corrosion. As a new option, potentially more energy-efficient CO2 capture processes with the use of solid-amine-functionalized adsorbents can be used in temperature-swing adsorption (TSA) arrangements. Experiments were carried out on a newly built fluidized bed thermo-gravimetric analysis (TGA) reactor to measure the adsorption isotherms of CO2 and H2O at different operating parameters. Lewatit VP OC 1065 was used as the amine-functionalized adsorbent. The adsorption equilibrium of CO2 on Lewatit VP OC 1065 was investigated first. The measured data could be sufficiently described by the Toth isotherm model. In the literature comparison it turns out that the CO2 loadings obtained in the present work are slightly higher than the values found by the other authors. To describe the adsorption of H2O on the adsorbent, two model functions based on the multi-layer approach by Brunauer, Emmet and Teller (BET) were used. Both BET models are largely consistent with the experimental data. At higher relative humidity, the adsorption loading in the standard BET model approaches infinity, while the extended BET model suggests plateau formation. It was found that Lewatit has a very high adsorption capacity as adsorbent of water, which is mainly dependent on the relative humidity in the gas stream. In addition, the standard BET model describes the adsorption behavior better than the extended BET model. Overall, the adsorption behavior on Lewatit VP OC 1065 can be well described using the models identified in this thesis.

Beurteilende(r): Pröll Tobias
1.Mitwirkender: Zerobin Florian

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