Post-Combustion Carbon Dioxide (COz) Capture with Biomass Derived Activated Carbon
The carbon dioxide (CO2) capture and storage are indispensable for reducing greenhouse gas emissions. Post-combustion capture is one of the most promising technologies to capture CO2 because it can be retrofitted to any facility with an acceptable footprint. Adsorption-based technologies are appealing for CO2 capture mainly due to the ease of the regeneration and the benign character of solid sorbents. To date, the greatest research efforts have aimed at improving efficient adsorbents with higher working capacity for CO2, higher selectivity, and better impurity tolerance. Among the alternative methodologies in adsorbent production, valorization of agricultural residues is an efficient way in terms of a sustainable circular economy. Besides, valorizing the agricultural residues in porous carbon materials contributes to the reduction of the overall cost of carbon capture since they are ubiquitous and inherently of low-cost. It may also provide a further benefit for more cost-effective waste management. In addition, in order to scale-up the adsorption based CO2 capture technology, cyclic adsorption processes are being designed and tried to be optimized. Especially, the temperature swing adsorption (TSA) processes are gaining more and more attention because they only require thermal energy, offering an additional advantage over pressure/vacuum swing adsorption (PSA/VSA) processes. In post-combustion CO2 capture literature, there are many studies that address the use of waste materials as precursors of adsorbents; the thesis study puts for the first time on evaluating the performance of hazelnut shells. The first aim of this dissertation is to develop activated carbon from hazelnut shells with suitable textural development in terms of microporosity and surface area to enhance the adsorption capacity, and to investigate its potential use for CO2 capture under post-combustion capture conditions with particular emphasis on the thermal energy requirements for regeneration. The second aim is to evaluate the performance of the hazelnut shell based activated carbon under dynamic conditions in a fixed-bed reactor over consecutive adsorption−desorption cycles. For that, the maximum CO2 capture capacities were determined from breakthrough curves in CO2/N2 binary mixture at different temperature and partial pressure conditions (14% and 30% CO2 at 30°C and 50°C) which close to the real ones encountered in an industrial process. The last aim is to design different TSA processes providing higher product (CO2) purity, recovery, productivity and lower specific energy consumption and to compare these processes performances with the ones obtained in VSA processes, which were also tested in the current study.
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| Format: | tesis doctoral biblioteca |
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Hacettepe University
2021-02-26
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| Subjects: | Biomass, Activated Carbon, CO2 Capture, Temperature Swing Adsorption, Vacuum Swing Adsorption, |
| Online Access: | http://hdl.handle.net/10261/278378 |
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