Development of Ionic Liquids Functionalized Porous Materials for CO2 Capture Applications

dc.contributor.advisorHenni, Amr
dc.contributor.advisorIbrahim, Hussameldin
dc.contributor.authorMohamedali, Mohanned Ezzelden
dc.contributor.committeememberShiriff, Ezeddin
dc.contributor.committeememberSalad Hersi, Osman
dc.contributor.externalexaminerCroiset, Eric
dc.date.accessioned2019-06-21T18:59:53Z
dc.date.available2019-06-21T18:59:53Z
dc.date.issued2018-12
dc.descriptionA Thesis Submitted to the Faculty of Graduate Studies and Research In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Process Systems Engineering, University of Regina. xx, 279 p.en_US
dc.description.abstractThe utilization of ionic liquids (ILs) for CO2 capture applications has recently gained considerable attention due to several remarkable properties including a high CO2 solubility, low volatility, and thermal stability. However, the cost and, in some cases, high viscosity of ILs are considered the major challenges for their wide scale applications in CO2 capture. One of the promising approaches to overcome these limitations is to incorporate ILs into solid porous materials also known as supported ILs (SILs) that were shown to enhance performance in various applications such as catalytic esterification reaction, ionic conductivity, and gas separation applications. In this work, the functionalization of various porous materials such as metal organic frameworks (MOFs) and mesoporous silica supports using ILs for applications in CO2 separation is presented. The immobilization of three ILs namely 1‑Butyl-3- methylimidazolium Acetate [bmim][Ac], 1‑Ethyl-3-methylimidazolium Acetate [emim][Ac], and 1‑Propyl-3-methylimidazolium bis(Trifluoromethylsulfonyl)imide [pmim][Tf2N] into different solid sorbents including zeolitic imidazolate framework (ZIF-8), Copper benzene-1,3,5-tricarboxylate (HKUST-1), chromium 1,4- benzenedicarboxylate (MIL-101), mesostructured silica (MCM-41), and (SBA-15) is reported. The synthesis, characterizations and CO2 capture performances of the different ILs-supported solid sorbents is presented to investigate the impacts of the nature of the ILs used, IL loading, and the role of synthesis methods on the physicochemical properties and CO2 capture performance. Thermogravimetric analysis (TGA) experiments were carried out under nitrogen environment to study the thermal stability of the composite materials and to quantify the composition of the impregnated samples. Fourier transform infrared spectroscopy (FTIR) was used to confirm the successful immobilization of ILs into the porous materials. N2 adsorption experiment at 77 K was conducted to evaluate the specific surface area and pore volume distribution of the different composite sorbents, whereas X-ray diffraction (XRD) analysis was carried out to study the influence of ILs incorporation on the crystallinity and phase stability of the solid sorbents. The adsorption isotherms of CO2 and N2 on the pure ILs, the pristine solid supports, and the different composite sorbents selected was evaluated at different temperatures using an intelligent gravimetric analyzer (IGA). The incorporation of acetate-based ILs into ZIF-8 framework was found to substantially enhance the CO2/N2 selectivity and CO2 capacity up to 7 times higher at 0.2 bar and 303 K using ZIF-8 with 30 wt.% [bmim][Ac] loading as compared to the pristine ZIF-8, which was attributed to the chemisorption interaction between CO2 and the carbonyl group on the acetate ILs. Remarkably, the impregnation of 5 wt.% [bmim][Ac] into HKUST-1 exhibited the highest CO2 uptake with double that of the pristine HKUST-1 at 303 K and 0.2 bar. On the other hand, the introduction of higher loadings of [bmim][Ac] and [pmim][Tf2N] into the pores of HKUST-1 did not show any enhancement in the CO2 capacity of the composite sorbents. Furthermore, no improvements in the CO2 uptakes could be achieved for the MIL-101 samples regardless of the synthesis protocol, whereas the MOF-177 incorporated with [emim][Ac], using wet impregnation method, has shown a remarkable enhancement in CO2 capacity in the low pressure region. Findings from this work provide insights into the synthesis, structure, and sorption capacity of these novel composite materials, which could be utilized for the design of sorbents with outstanding properties to meet the environmental challenges.en_US
dc.description.authorstatusStudenten
dc.description.peerreviewyesen
dc.identifier.tcnumberTC-SRU-8835
dc.identifier.thesisurlhttps://ourspace.uregina.ca/bitstream/handle/10294/8835/Mohamedali_Mohanned_PhD_PSEN_Spring2019.pdf
dc.identifier.urihttps://hdl.handle.net/10294/8835
dc.language.isoenen_US
dc.publisherFaculty of Graduate Studies and Research, University of Reginaen_US
dc.titleDevelopment of Ionic Liquids Functionalized Porous Materials for CO2 Capture Applicationsen_US
dc.typeThesisen
thesis.degree.departmentFaculty of Engineering and Applied Scienceen_US
thesis.degree.disciplineEngineering - Process Systemsen_US
thesis.degree.grantorUniversity of Reginaen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophy (PhD)en_US
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