Papers by AKANJI OLAITAN
The electrochemical corrosion behaviour of the synergistic effect of 4-hydroxy-3-methoxybenzaldeh... more The electrochemical corrosion behaviour of the synergistic effect of 4-hydroxy-3-methoxybenzaldehyde and 1, 4-diaminobenzene on mild steel in dilute sulphuric and hydrochloric acid solution (1M concentration) with 1.5% recrystallized sodium chloride evaluated with weight loss analysis, potentiodynamic polarization test and optical microscopy. Statistical analysis of the results was done with Two-way ANOVA to assess their statistical significance of the experimental variables on inhibition efficiency values. Results show the combined organic derivatives performed effectively in both acids with average inhibition efficiency values above 85%. Observations from optical microscopy images further confirm the results of experimental data. Statistical derivations reveal the overwhelming significance of exposure time only inhibition efficiency values in both acids.
The article reviews a brief literature on the modeling of hydrogen storage device for fuel cell. ... more The article reviews a brief literature on the modeling of hydrogen storage device for fuel cell. Different dimensional approaches in modeling hydrogen absorption/desorption in a metal hydride reactor for use in fuel cell are summarized. Mathematical modeling equations involved are also stated. The effect of various operating parameters such as temperature, concentration, viscosity, thermal conductivity and time on the gas is also verified. The importance of various simulation software with reference to their major functions is also identified. The review concludes on the opportunities and challenges with the use of hydrogen as an alternative renewable energy.
TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings, 2018
The synergistic effect of the combined admixture of benzonitrile and benzothiazole (BBZ) on the c... more The synergistic effect of the combined admixture of benzonitrile and benzothiazole (BBZ) on the corrosion inhibition of 316 austenitic stainless steel in 6M HCl solution was evaluated through potentiodynamic polarization, coupon measurement, optical microscopy and IR spectroscopy analysis. Results obtained showed the effective corrosion inhibition performance of the admixture with optimal inhibition efficiency value of 95%. Identified functional groups of alcohols, phenols, amines, amides, carboxylic acids, aliphatic amines, esters and ethers within the compound completely adsorbed onto the steel from analysis of the adsorption spectra while others decreased in intensity due to partial adsorption. Thermodynamic calculations showed the cationic adsorption through chemisorption mechanism according to Langmuir and Freundlich adsorption isotherms. Micro-analytical images showed a badly corroded morphology with corrosion pits in the absence of compounds which contrast the images obtained with the compound. The compound was determined to be mixed type inhibition.
Chemical Data Collections, 2019
Synergistic combination of organic derivatives provide insight on alternative application of know... more Synergistic combination of organic derivatives provide insight on alternative application of known chemical compounds for corrosion inhibition. The electrochemical corrosion inhibition of the combined admixture of vanillin and 1, 4-diaminobenzene (VDB), and vanillin with sodium molybdenum oxide (VSMO) on carbon steel in 1 M H 2 SO 4 and HCl solutions was evaluated with weight loss measurement. Results show VDB performed more effectively in both acids with average inhibition efficiency above 85% in HCl and 90% in H 2 SO 4 compared to VSMO whose average inhibition efficiency is slightly above 70% in HCl.
Advanced Materials for Renewable Hydrogen Production, Storage and Utilization, 2015
Hydrogen has been considered as an alternative source of fuel to the fossil fuel in future, most ... more Hydrogen has been considered as an alternative source of fuel to the fossil fuel in future, most especially, for mobile applications. However, a requirement is the safe, efficient and compact on-board storage of hydrogen. Reversible storage in metal hydride is promising, but adequate knowledge of materials system fulfills all requirements regarding hydrogen content is a major drawback, release temperature, and reversibility simultaneously. Hydrogen absorption-desorption in a metal hydride bed reactor can be modeled using different software such as FLUENT, CFD-ACE, and COMSOL Multiphysics. This book chapter will focus on the use of software COMSOL Multiphysics to simulate the diffusion and heating of hydrogen and metal hydride powder in both radial and axial directions. The model consists of system of partial differential equations (PDE) describing two-dimensional heat and mass transfer of hydrogen in a porous matrix. The influence of the operating parameters Temperature, Pressure, Concentration, Permeability and Thermal Conductivity on the rate of absorption-desorption of hydrogen in metal hydride will be fully discussed. The simulation results obtained could be applied to the on-board hydrogen storage technology, in particular for the hydrogen supply of a fuel cell for powering of a hydrogen fuel cell vehicle.
In this paper, a 2D dynamic Simulation for a portion of metal hydride based hydrogen storage tank... more In this paper, a 2D dynamic Simulation for a portion of metal hydride based hydrogen storage tank was performed using Computational Software COMSOL 4.0a Multiphysics. The software is used to simulate the diffusion and heating of hydrogen and metal hydride powder in both radial and axial directions. The model consists of a system of partial differential; equations (PDE) describing two dimensional heat and mass transfer of hydrogen in a porous matrix. The phenomenon of hydrogen absorption/ desorption is accompanied by thermal effects, such as heat release during absorption or heat Consumption during desorption. The thermal effects influence the temperature distribution in the metal hydride, and conversely the temperature distribution affects the rate of hydrogen release or consumption. The effects of different parameters such as temperature, pressure, thermal conductivity, permeability and internal geometries inside the hydride tank on the outflow/inflow of hydrogen gas were investiga...
The Minerals, Metals & Materials Series
2101 lean duplex steel was subjected to extreme temperature of 1200 ℃ and subsequently cooled at ... more 2101 lean duplex steel was subjected to extreme temperature of 1200 ℃ and subsequently cooled at rapid and slow rate before assessing its corrosion resistance in 2 M H2SO4/0%–1.75% NaCl. The annealed steel specimen (A2101ST) corroded at maximum corrosion rate of 11.3 mm/y (0.5% NaCl), trailed by the quenched specimen (Q2101ST). The untreated steel specimen (ASR2101ST) retained it passivity up to 1.75% NaCl. At this concentration, the passive films on Q2101ST and A2101ST collapsed in the presence of the corrosive species. Low surface deterioration occurred on ASR2101ST in comparison to severe intergranular and pitting corrosion on Q2101ST. Pseudo-corrosion pits formed on the surface of A2101ST.
Electrochemical studies of the synergistic effect
of p-phenylenediamine and n,n diphenylthiourea ... more Electrochemical studies of the synergistic effect
of p-phenylenediamine and n,n diphenylthiourea (TPD) as
corrosion inhibitor of mild steel in dilute sulphuric and
hydrochloric acid through weight loss and potentiodynamic
polarization at ambient temperature were performed.
Experimental results showed the excellent performance of
TPD with an optimal inhibition efficiency of 88.18 and
93.88 %in sulphuric and 87.42 and 87.15 %in hydrochloric
acid from both tests at all concentration studied. Polarization
studies show the compound to be a mixed-type inhibitor.
Adsorption of deanol on the steel surface was observed to
obey the Langmuir and Frumkin isotherm models. X-ray
diffractometry confirmed the absence of corrosion products
and complexes. Optical microscopy confirmed the selective
inhibition property of TPD to be through chemical adsorption
on the steel surface.
In this paper, a 2D-dynamic simulation for a portion of metal hydride based hydrogen storage tank... more In this paper, a 2D-dynamic simulation for a portion of metal hydride based hydrogen storage tank was performed using computational software COMSOL 4.0a Multiphysics. The software is used to simulate the diffusion and heating of hydrogen and metal hydride powder in both radial and axial direction. The model consists of a system of partial differential equations (PDE) describing two dimensional heat and mass transfer of hydrogen in a porous matrix. The purpose of this work was to investigate the influence of various internal geometries inside the metal hydride hydrogen storage tank (MHHST) on the outflow/inflow of hydrogen gas. The geometry of a metal hydride based hydrogen storage reactor was simulated to properly investigate the absorption/desorption rate of hydrogen in/out of the system. The effect of the following parameters; pressure, temperature, permeability, and thermal conductivity on the rate of absorption/desorption was fully discussed.
The article reviews a brief literature on the modeling of hydrogen storage device for fuel cell. ... more The article reviews a brief literature on the modeling of hydrogen storage device for fuel cell. Different dimensional approaches in modeling hydrogen absorption/desorption in a metal hydride reactor for use in fuel cell are summarized. Mathematical modeling equations involved are also stated. The effect of various operating parameters such as temperature, concentration, viscosity, thermal conductivity and time on the gas is also verified. The importance of various simulation software with reference to their major functions is also identified. The review concludes on the opportunities and challenges with the use of hydrogen as an alternative renewable energy.
Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen s... more Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen storage systems. Some operational and design variables are major constraints to obtain a proper infl ow/outfl ow of hydrogen into a metal hydride reactor. These variables include packed bed thermal conductivity, poros-ity, pressure and temperature distributions in the reactor during the absorption/desorption cycle. They also cause a mechanical stress induced by temperature gradient. In this paper, two dimensional models are implemented in COMSOL multiphysics to simulate the hydrogen fl ow, pressure and temperature distributions in the packed bed reactor during absorption/desorption cycle. Also, stresses in porous metal hydride induced by temperature variation in the heating/cooling cycle were evaluated. A possible effect of stress induced, porosity changes on diffusion and heating of hydrogen in both radial and axial direction in packed bed is discussed. The model consists of a system of partial differential equations (PDE) describing structural mechanics of stress, heat and mass transfer of hydrogen in the porous matrix of the packed bed reactor.
Polish Journal of Chemical Technology, 2012
Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen s... more Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen storage systems. Some operational and design variables are major constraints to obtain a proper infl ow/outfl ow of hydrogen into a metal hydride reactor. These variables include packed bed thermal conductivity, porosity, pressure and temperature distributions in the reactor during the absorption/desorption cycle. They also cause a mechanical stress induced by temperature gradient. In this paper, two dimensional models are implemented in COMSOL multiphysics to simulate the hydrogen fl ow, pressure and temperature distributions in the packed bed reactor during absorption/desorption cycle. Also, stresses in porous metal hydride induced by temperature variation in the heating/cooling cycle were evaluated. A possible effect of stress induced, porosity changes on diffusion and heating of hydrogen in both radial and axial direction in packed bed is discussed. The model consists of a system of partial differential equations (PDE) describing structural mechanics of stress, heat and mass transfer of hydrogen in the porous matrix of the packed bed reactor.
Journal of Computational and Theoretical Nanoscience, 2010
In order to make efficient hydrogen storage utilization as a fuel in fuel cell plant, there is ne... more In order to make efficient hydrogen storage utilization as a fuel in fuel cell plant, there is need for its effective storage. Previous studies on hydrogen storage considered the hydrogen adsorption/desorption in radial direction only which is one dimensional approach in this project, two dimensional computational model is implemented in CFD software to simulate the diffusion and heating of hydrogen in both radial and axial directions. The model consists of a system of partial differential equation (PDE) describing two-dimensional heat and mass transfer of hydrogen in porous matrix. Mathematical model was developed to simulate heat and mass transfer in a packed bed reactor with metal hydride as a material for hydrogen absorption and desorption. Importance of bed porosity radial distribution and correct equation for effective thermal conductivity is discussed.
Journal of Computational and Theoretical Nanoscience, 2013
ABSTRACT 2D-dynamic simulation for a portion of metal hydride based hydrogen storage tank was per... more ABSTRACT 2D-dynamic simulation for a portion of metal hydride based hydrogen storage tank was performed using computational software COMSOL 4.0a Multiphysics. The software is used to simulate the diffusion and heating of hydrogen and metal hydride powder in both radial and axial direction. The model consists of a system of partial differential equations (PDE) describing two dimensional heat and mass transfer of hydrogen in a porous matrix. The purpose of this work was to investigate the influence of various internal geometries inside the metal hydride hydrogen storage tank (MHHST) on the outflow/inflow of hydrogen gas. The geometry of a metal hydride based hydrogen storage reactor was simulated to properly investigate the absorption/desorption rate of hydrogen in/out of the system. The effect of the following parameters; pressure, temperature, permeability, and thermal conductivity on the rate of absorption/desorption was fully discussed.
International Journal of Industrial Chemistry, 2015
Electrochemical studies of the synergistic effect of p-phenylenediamine and n,n diphenylthiourea ... more Electrochemical studies of the synergistic effect of p-phenylenediamine and n,n diphenylthiourea (TPD) as corrosion inhibitor of mild steel in dilute sulphuric and hydrochloric acid through weight loss and potentiodynamic polarization at ambient temperature were performed. Experimental results showed the excellent performance of TPD with an optimal inhibition efficiency of 88.18 and 93.88 %in sulphuric and 87.42 and 87.15 %in hydrochloric acid from both tests at all concentration studied. Polarization studies show the compound to be a mixed-type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin isotherm models. X-ray diffractometry confirmed the absence of corrosion products and complexes. Optical microscopy confirmed the selective inhibition property of TPD to be through chemical adsorption on the steel surface.
Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen s... more Packed bed reactors using metal hydride are attracting a lot of attention as potential hydrogen storage systems. Some operational and design variables are major constraints to obtain a proper infl ow/outfl ow of hydrogen into a metal hydride reactor. These variables include packed bed thermal conductivity, porosity, pressure and temperature distributions in the reactor during the absorption/desorption cycle. They also cause a mechanical stress induced by temperature gradient. In this paper, two dimensional models are implemented in COMSOL multiphysics to simulate the hydrogen fl ow, pressure and temperature distributions in the packed bed reactor during absorption/desorption cycle. Also, stresses in porous metal hydride induced by temperature variation in the heating/cooling cycle were evaluated. A possible effect of stress induced, porosity changes on diffusion and heating of hydrogen in both radial and axial direction in packed bed is discussed. The model consists of a system of partial differential equations (PDE) describing structural mechanics of stress, heat and mass transfer of hydrogen in the porous matrix of the packed bed reactor.
Conference Presentations by AKANJI OLAITAN
In this paper, a 2D dynamic Simulation for a portion of metal hydride based hydrogen storage tank... more In this paper, a 2D dynamic Simulation for a portion of metal hydride based hydrogen storage tank was performed using Computational Software COMSOL 4.0a Multiphysics. The software is used to simulate the diffusion and heating of hydrogen and metal hydride powder in both radial and axial directions. The model consists of a system of partial differential; equations (PDE) describing two dimensional heat and mass transfer of hydrogen in a porous matrix. The phenomenon of hydrogen absorption/ desorption is accompanied by thermal effects, such as heat release during absorption or heat Consumption during desorption. The thermal effects influence the temperature distribution in the metal hydride, and conversely the temperature distribution affects the rate of hydrogen release or consumption. The effects of different parameters such as temperature, pressure, thermal conductivity, permeability and internal geometries inside the hydride tank on the outflow/inflow of hydrogen gas were investigated.
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Papers by AKANJI OLAITAN
of p-phenylenediamine and n,n diphenylthiourea (TPD) as
corrosion inhibitor of mild steel in dilute sulphuric and
hydrochloric acid through weight loss and potentiodynamic
polarization at ambient temperature were performed.
Experimental results showed the excellent performance of
TPD with an optimal inhibition efficiency of 88.18 and
93.88 %in sulphuric and 87.42 and 87.15 %in hydrochloric
acid from both tests at all concentration studied. Polarization
studies show the compound to be a mixed-type inhibitor.
Adsorption of deanol on the steel surface was observed to
obey the Langmuir and Frumkin isotherm models. X-ray
diffractometry confirmed the absence of corrosion products
and complexes. Optical microscopy confirmed the selective
inhibition property of TPD to be through chemical adsorption
on the steel surface.
Conference Presentations by AKANJI OLAITAN
of p-phenylenediamine and n,n diphenylthiourea (TPD) as
corrosion inhibitor of mild steel in dilute sulphuric and
hydrochloric acid through weight loss and potentiodynamic
polarization at ambient temperature were performed.
Experimental results showed the excellent performance of
TPD with an optimal inhibition efficiency of 88.18 and
93.88 %in sulphuric and 87.42 and 87.15 %in hydrochloric
acid from both tests at all concentration studied. Polarization
studies show the compound to be a mixed-type inhibitor.
Adsorption of deanol on the steel surface was observed to
obey the Langmuir and Frumkin isotherm models. X-ray
diffractometry confirmed the absence of corrosion products
and complexes. Optical microscopy confirmed the selective
inhibition property of TPD to be through chemical adsorption
on the steel surface.