Acidic catalyzed magnesium hydride and nanocomposites for hydrogen generation : synthesis and application
- Authors: Adeniran, Joshua Adeniyi
- Date: 2019
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/443731 , uj:38755
- Description: Abstract: This study presents the successful synthesis, characterization and hydrolysis of magnesium hydride (MgH2) and MgH2 based nanocomposites for hydrogen generation, storage and wastewater treatment. The as-delivered MgH2 serves as a precursor in most of the substrates synthesized for hydrogen production and storage in this study. In addition, Mg scrap was also investigated for the same purpose. The nanocomposites were prepared by means of a ball milling process in different time spans. MgH2, germanium (Ge), lithium aluminium hydride (LiAlH4), sodium aluminium hydride (NaAlH4), magnesium (Mg) scrap were the hydrogen generation/ storage substrates used in this study. The nanocomposites from the substrates were synthesized through ball milling of the powders in argon. The phase-structural and morphological characteristics of the composites were evaluated using transmission electron microscopy (TEM), selected area diffraction (SAD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray dispersive diffraction (XRD) characterization techniques... , D.Phil. (Mechanical Engineering)
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- Authors: Adeniran, Joshua Adeniyi
- Date: 2019
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/443731 , uj:38755
- Description: Abstract: This study presents the successful synthesis, characterization and hydrolysis of magnesium hydride (MgH2) and MgH2 based nanocomposites for hydrogen generation, storage and wastewater treatment. The as-delivered MgH2 serves as a precursor in most of the substrates synthesized for hydrogen production and storage in this study. In addition, Mg scrap was also investigated for the same purpose. The nanocomposites were prepared by means of a ball milling process in different time spans. MgH2, germanium (Ge), lithium aluminium hydride (LiAlH4), sodium aluminium hydride (NaAlH4), magnesium (Mg) scrap were the hydrogen generation/ storage substrates used in this study. The nanocomposites from the substrates were synthesized through ball milling of the powders in argon. The phase-structural and morphological characteristics of the composites were evaluated using transmission electron microscopy (TEM), selected area diffraction (SAD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray dispersive diffraction (XRD) characterization techniques... , D.Phil. (Mechanical Engineering)
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Energy generating performance of domestic wastewater fed sandwich dual-chamber microbial fuel cells
- Authors: Adeniran, Joshua Adeniyi
- Date: 2015-06-26
- Subjects: Waste products as fuel , Water - Purification - Membrane filtration , Water - Purification - Biological treatment , Sewage - Purification - Anaerobic treatment , Microbial fuel cells , Waste heat , Bioreactors
- Type: Thesis
- Identifier: uj:13627 , http://hdl.handle.net/10210/13808
- Description: M.Tech. (Civil Engineering) , This study presents work on the design and construction of three dual-chamber microbial fuel cells (MFCs) using a sandwich separator electrode assembly (SSEA) and membrane cathode assembly (MCA) for the dual purposes of energy generation from domestic wastewater and wastewater treatment. MFC1 was designed using an improvised SSEA technique (i.e. a separator electrode membrane electrode configuration, SEMEC) by gluing a sandwich of anode, membrane and a mesh current collector cathode to an anode chamber made from a polyethylene wide-mouth bottle. The reactor was filled with 1500 mL of domestic wastewater and operated on a long fed-batch mode with a residence time of 3 weeks. The reactor was inoculated with a mixed culture of bacteria present in the wastewater stream. The aim was to study the impact of wastewater COD concentration on power generation and wastewater treatment efficiency. For MFC2 and MFC 3, cathodes were constructed using the MCA technique consisting of a membrane and a mesh current collector cathode, with the anode electrode at the opposite side of stacked Perspex sections used for the anode chamber. The impact of electrode material on current production was examined in this study. For MFC2 a mesh current collector treated with polytetrafluoroethylene (PTFE) and activated carbon (AC) functioned as the cathode, while the MFC3 cathode was an uncatalyzed mesh current collector. The two reactors were both filled with 350 mL of domestic wastewater...
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- Authors: Adeniran, Joshua Adeniyi
- Date: 2015-06-26
- Subjects: Waste products as fuel , Water - Purification - Membrane filtration , Water - Purification - Biological treatment , Sewage - Purification - Anaerobic treatment , Microbial fuel cells , Waste heat , Bioreactors
- Type: Thesis
- Identifier: uj:13627 , http://hdl.handle.net/10210/13808
- Description: M.Tech. (Civil Engineering) , This study presents work on the design and construction of three dual-chamber microbial fuel cells (MFCs) using a sandwich separator electrode assembly (SSEA) and membrane cathode assembly (MCA) for the dual purposes of energy generation from domestic wastewater and wastewater treatment. MFC1 was designed using an improvised SSEA technique (i.e. a separator electrode membrane electrode configuration, SEMEC) by gluing a sandwich of anode, membrane and a mesh current collector cathode to an anode chamber made from a polyethylene wide-mouth bottle. The reactor was filled with 1500 mL of domestic wastewater and operated on a long fed-batch mode with a residence time of 3 weeks. The reactor was inoculated with a mixed culture of bacteria present in the wastewater stream. The aim was to study the impact of wastewater COD concentration on power generation and wastewater treatment efficiency. For MFC2 and MFC 3, cathodes were constructed using the MCA technique consisting of a membrane and a mesh current collector cathode, with the anode electrode at the opposite side of stacked Perspex sections used for the anode chamber. The impact of electrode material on current production was examined in this study. For MFC2 a mesh current collector treated with polytetrafluoroethylene (PTFE) and activated carbon (AC) functioned as the cathode, while the MFC3 cathode was an uncatalyzed mesh current collector. The two reactors were both filled with 350 mL of domestic wastewater...
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Organic acid-catalyzed hydrolysis of Magnesium hydride for generation of hydrogen in a batch system hydrogen reactor
- Adeniran, Joshua Adeniyi, Akinlabi, Esther Titilayo, Chen, Hong-Sheng, Fono-Tamo, Romeo, Jen, Tien-Chien
- Authors: Adeniran, Joshua Adeniyi , Akinlabi, Esther Titilayo , Chen, Hong-Sheng , Fono-Tamo, Romeo , Jen, Tien-Chien
- Date: 2017
- Subjects: hydrolysis, hydrogen generation , Hydrolysis , Hydrogen generation , Kinetics
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/241943 , uj:24943 , Citation: Adeniran, J.A. 2017. Organic acid-catalyzed hydrolysis of Magnesium hydride for generation of hydrogen in a batch system hydrogen reactor.
- Description: Abstract: Hydrogen generation from MgH2 is of interest to the research community due to various alluring attributes of MgH2 as a hydrogen generation substrate. In this study MgH2 powder was utilized as a substrate in hydrolysis reaction catalyzed by acetic acid, an environmentally friendly and relatively cheap acid. The reaction was conducted in a hydrogen generation reactor operated in a batch mode. Three sample weights (0.4g, 0.8g and 1.2g) of the substrates were utilized for the experiment at 40, 50, 60 and 70 wt% acetic acid concentration at 50 °C for investigation of the roles of substrate weigh and catalyst concentration on hydrogen yield. The results indicated that MgH2 powder weight influenced hydrogen generation more compared to the catalyst concentration. The highest hydrogen yield in the study was 0.048 L hydrogen gas from 0.4g MgH2 powder (70 wt% acetic acid) while the highest hydrogen generation was reported when 1.2g substrate hydrolyzed in 50 wt% acetic acid.
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- Authors: Adeniran, Joshua Adeniyi , Akinlabi, Esther Titilayo , Chen, Hong-Sheng , Fono-Tamo, Romeo , Jen, Tien-Chien
- Date: 2017
- Subjects: hydrolysis, hydrogen generation , Hydrolysis , Hydrogen generation , Kinetics
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/241943 , uj:24943 , Citation: Adeniran, J.A. 2017. Organic acid-catalyzed hydrolysis of Magnesium hydride for generation of hydrogen in a batch system hydrogen reactor.
- Description: Abstract: Hydrogen generation from MgH2 is of interest to the research community due to various alluring attributes of MgH2 as a hydrogen generation substrate. In this study MgH2 powder was utilized as a substrate in hydrolysis reaction catalyzed by acetic acid, an environmentally friendly and relatively cheap acid. The reaction was conducted in a hydrogen generation reactor operated in a batch mode. Three sample weights (0.4g, 0.8g and 1.2g) of the substrates were utilized for the experiment at 40, 50, 60 and 70 wt% acetic acid concentration at 50 °C for investigation of the roles of substrate weigh and catalyst concentration on hydrogen yield. The results indicated that MgH2 powder weight influenced hydrogen generation more compared to the catalyst concentration. The highest hydrogen yield in the study was 0.048 L hydrogen gas from 0.4g MgH2 powder (70 wt% acetic acid) while the highest hydrogen generation was reported when 1.2g substrate hydrolyzed in 50 wt% acetic acid.
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