Post-Combustion Carbon Dioxide Capture using Alumina-Supported Potassium Carbonate

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dc.contributor.advisorMahinpey, Nader
dc.contributor.authorBararpourhamzehkolaei, Seyedtoufigh
dc.contributor.committeememberDong, Mingzhe
dc.contributor.committeememberLu, Qingye
dc.contributor.committeememberBirss, Viola I.
dc.contributor.committeememberKumar, Amit
dc.date2021-06
dc.date.accessioned2021-01-12T19:04:43Z
dc.date.available2021-01-12T19:04:43Z
dc.date.issued2021-01-05
dc.description.abstractThe solid sorbent-based CO2 capture process has been studied extensively in recent years as a cost-effective and efficient method for capturing CO2. Among various solid sorbents, K2CO3 has been selected for further investigation and evaluation in this work due to its high theoretical CO2 capture capacity, favorable carbonation/regeneration temperatures, relatively low cost and high selectivity. Firstly, the effect of different synthesis techniques and alumina-based supports was investigated on the capturing performance of K2CO3-based solid sorbents. For this purpose, three types of alumina-based supports and two preparation techniques were employed. It was shown that surface area and hydrophilicity of the supports are important factors in determining the capturing efficiency of the sorbents. In the second paper, a highly-efficient alumina-based support (alumina-aerogel) with a significantly large surface area (over 2000 m2/g) was synthesized. The alumina-aerogel-supported K2CO3 showed a surprisingly high CO2 capture capacity of 7.2 mmol CO2/g K2CO3. The effect of key operating parameters (e.g. carbonation temperature and H2O-to-CO2 flowrate ratio) was studied on the CO2 uptake, and the optimum values were found to be 56.1 ÂșC and 1.1, respectively. In the third paper, another technique (core-shell) was utilized to improve the cyclic CO2 uptake of K2CO3-based sorbents. In the core-shell technique, the alumina support was shelled with another material (TiO2, SiO2 and ZrO2) to improve the chemical stability and capturing capacity of the sorbents. Among various synthesized samples, K2CO3/Boehmite-TiO2 showed the best performance with a CO2 uptake of 6.61 mmol CO2/g K2CO3. In addition, three kinetic models were applied to investigate the adsorption rate of CO2 in the carbonation step, and Avrami was the best-fit model with a regression coefficient of 0.99. Finally, the last paper investigates the impact of textural properties of the support, including surface area, pore volume and pore size on the capturing capacity of K2CO3-based sorbents. For this purpose, supports with varied textural properties were synthesized by using specific surfactants. It was found that apart from surface area and pore volume, pore size had a significant impact on the CO2 uptake. By increasing the size of mesopores, CO2 uptake improved as well.en_US
dc.identifier.citationBararpourhamzehkolaei, S. (2021). Post-Combustion Carbon Dioxide Capture using Alumina-Supported Potassium Carbonate (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/38545
dc.identifier.urihttp://hdl.handle.net/1880/112964
dc.language.isoengen_US
dc.publisher.facultySchulich School of Engineeringen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectCO2 captureen_US
dc.subjectAdsorptionen_US
dc.subjectSolid sorbenten_US
dc.subjectK2CO3en_US
dc.subjectPost-combustionen_US
dc.subject.classificationEngineering--Chemicalen_US
dc.subject.classificationEngineering--Environmentalen_US
dc.titlePost-Combustion Carbon Dioxide Capture using Alumina-Supported Potassium Carbonateen_US
dc.typedoctoral thesisen_US
thesis.degree.disciplineEngineering – Chemical & Petroleumen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameDoctor of Philosophy (PhD)en_US
ucalgary.item.requestcopytrueen_US
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