- Title
- Catalytic improvement of CO2 hydration relevant to the post combustion capture process
- Creator
- Phan, Duong Thuy
- Relation
- University of Newcastle Research Higher Degree Thesis
- Resource Type
- thesis
- Date
- 2015
- Description
- Research Doctorate - Doctor of Philosophy (PhD)
- Description
- The increasing emissions of such greenhouse gases as carbon dioxide (CO₂) foster the need for the removal of CO₂ from gas streams, especially from coal-fired power stations. One of the common technologies of CO₂ Post Combustion Capture (PCC) is reversible chemical absorption using amine-based solvents. For PCC to be efficient, the rate of the absorption of CO₂ in aqueous solution has to be fast in order to minimise the spatial requirements of the absorber column. Therefore, the catalysis of CO₂ hydration/dehydration is of utmost interest. In this project, series of inorganic oxoanions and carbonic anhydrases were studied by stopped-flow spectrophotometry with the aim of elucidating their chemistry in the interaction with CO₂ and finding a good catalyst for PCC. Additionally, it is crucial to closely monitor the PCC process by developing on-line analyses. Fourier-transform infrared (FT-IR) spectroscopy is a promising spectroscopic tool for this purpose thanks to its robustness and ease of data interpretation. The second focus of this project is to investigate the feasibility of using FT-IR spectroscopy for on-line analysis for PCC application by monitoring the kinetics of the reaction of bicarbonate with MEA by this spectroscopy. The outcomes of this project would benefit the development of effective CO₂ capture facilities, contributing to the reduction of greenhouse gas emissions. The limitations in terms of time consumption and complexity of the traditional method to study an enzymatic system inspired the development of a novel kinetic procedure to analyse the efficiency of enzymatic catalysis, i.e. the Michaelis-Menten parameters. The principle of this method is that the kinetics of an enzymatically catalysed reaction is observed from the initial high substrate concentration until the substrate is entirely consumed. The course of the reaction process is followed via the solution pH changes. This approach is different from the integration method in which the determination of the substrate or product concentration is required, which is difficult. The new procedure has been applied to the study of urea hydrolysis by jack bean urease. Not only have the Michaelis constant and catalytic constant been determined with ease, the catalytic mechanism of urease was further clarified. This novel method is applicable to the study of many other enzymatic systems.
- Subject
- post combustion capture; CO₂; inorganic oxoanions; carbonic anhydrase; enzyme; on-line analysis; thesis by publication
- Identifier
- http://hdl.handle.net/1959.13/1310465
- Identifier
- uon:22042
- Rights
- Copyright 2015 Duong Thuy Phan
- Language
- eng
- Full Text
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| View Details Download | ATTACHMENT02 | Thesis | 18 MB | Adobe Acrobat PDF | View Details Download |