Browsing by Author "22730389 - Bessarabov, Dmitri Georgievich"
Now showing items 1-20 of 93
-
Analysis of reaction mixtures of perhydro-dibenzyltoluene using two-dimensional gas chromatography and single quadrupole gas chromatography
Modisha, Phillimon M.; Jordaan, Johan H.L.; Bessarabov, Dmitri; Bösmann, Andreas; Wasserscheid, Peter (Elsevier, 2018)Energy storage via liquid organic hydrogen carrier (LOHC) systems has gained significant attention in recent times. A dibenzyltoluene (DBT) based LOHC offers excellent properties which largely solve today's hydrogen storage ... -
Application of membrane technology in a base metal refinery
Nel, D.W.; Van der Gryp, P.; Neomagus, H.W.J.P.; Bessarabov, D. (SAIMM, 2013)Nanofiltration (NF) has attracted much attention over the past few years due to the reduced energy consumption compared to reverse osmosis (RO) and better separation performance compared to ultrafiltration (UF). Although ... -
Application of nanoparticles in biofuels: an overview
Sekoai, Patrick T.; Ouma, Cecil Naphtaly Moro; Du Preez, Stephanus Petrus; Modisha, Phillimon; Engelbrecht, Nicolaas; Bessarabov, Dmitri G. (Elsevier, 2019)Biofuels are fast advancing as alternative sources of renewable energy due to their non-polluting features and cost-competitiveness in comparison to fossil fuels. However, in order to fast-track their development, focus ... -
Catalytic dehydrogenation of the liquid organic hydrogen carrier octahydroindole on Pt (111) surface: ab initio insights from density functional theory calculations
Ouma, Cecil N.M.; Modisha, Phillimon M.; Bessarabov, Dmitri (Elsevier, 2019)Ab initio calculations based on dispersion-corrected density functional theory were used to gain insight into the adsorption properties of reactants and products involved in the catalytic dehydrogenation of octahydroindole ... -
Catalytic dehydrogenation onset of liquid organic hydrogen carrier, perhydro-dibenzyltoluene: the effect of Pd and Pt subsurface configurations
Ouma, C.N.M.; Modisha, P.M.; Bessarabov, D. (Elsevier, 2019)Perhydro-dibenzyltoluene (H18-DBT) is the hydrogen-rich form of the liquid organic hydrogen carrier (LOHC), dibenzyltoluene. The reversible catalytic hydrogenation and dehydrogenation of LOHCs has made them highly favored ... -
CFD simulation and experimental study of a hydrogen leak in a semi-closed space with the purpose of risk mitigation
Malakhov, A.A.; Avdeenkov, A.V.; Du Toit, M.H.; Bessarabov, D.G. (Elsevier, 2020)Computational fluid dynamics (CFD) methods were used to analyze hydrogen leakage in a semi-closed ventilation facility. The goal of the research was to apply numerical simulations to verify hydrogen distribution in the ... -
Characterisation of a PEM electrolyser using the current interrupt method
Martinson, C.A.; Van Schoor, G.; Uren, K.R.; Bessarabov, D. (Elsevier, 2014)A method is proposed to model the electrochemical characteristics of a Proton Exchange Membrane (PEM) electrolyser. The electrochemical characteristics, which include the Ohmic, activation and concentration losses, are ... -
Characterisation of a polyaromatic PBI blend membrane for SO2 electrolysis
Krüger, Andries J.; Kerres, Jochen; Bessarabov, Dmitri; Krieg, Henning M.; Cichon, Patrizia (Elsevier, 2015)The application of a polyaromatic acid–base blend membrane from partially fluorinated and sulfonated aromatic polyether and the polybenzimidazole F6PBI has been investigated for hydrogen production using SO2 electrolysis. ... -
Characterisation tools development for PEM electrolysers
Van der Merwe, Jan; Uren, Kenny; Van Schoor, George; Bessarabov, Dmitri (Elsevier, 2014)Electrochemical impedance spectroscopy (EIS), current interrupt (CI) and current mapping (CM) were investigated as in-situ characterisation tools for PEM electrolysers. A 25 cm2 cell with titanium anode and carbon cathode ... -
CNF-supported platinum electrocatalysts synthesized using plasma-assisted sputtering in pulse conditions for the application in a high-temperature PEM fuel cell
Grigoriev, Sergey A.; Bessarabov, Dmitri G.; Fateev, Vladimir N.; Lutikova, Elena K.; Grigoriev, Alexander S. (ESG, 2016)Nanostructured platinum catalysts for a high-temperature proton-exchange membrane (PEM) fuel cell based on polybenzimidazole (PBI) doped by H3PO4 were synthesized by magnetron-ion sputtering of platinum on carbon nano-fibers ... -
Comparative study of anion exchange membranes for low-cost water electrolysis
Pushkareva, I.V.; Modisha, P.; Bessarabov, D.G.; Pushkarev, A.S.; Grigoriev, S.A. (Elsevier, 2020)Various anion-exchange membranes (AEMs) were studied in the electrolysis cell using the non-precious metal-based catalysts showing the good potential of selected AEMs in low-cost water electrolysis application. The 0.1–1 ... -
Comparison of ionically and ionical-covalently cross-linked polyaromatic membranes for SO2 electrolysis
Peach, Retha; Krieg, Henning M.; Krüger, Andries J.; Van der Westhuizen, Derik; Bessarabov, Dmitri (Elsevier, 2014)It has been shown that hydrogen, which can be used for energy storage, can be produced efficiently by the membrane based Hybrid Sulfur (HyS) process. During the HyS electrolysis step, SO2 and H2O are converted to H2 and ... -
Current density distribution of electrolyzer flow fields: in situ current mapping and neutron radiography
Minnaar, Carel; Bessarabov, Dmitri; De Beer, Frikkie (ACS, 2020)A polymer electrolyte membrane water electrolyzer plays an important role in the development of renewable energy storage systems due to its high current density capability and quick response to intermittent input power ... -
Current status, research trends, and challenges in water electrolysis science and technology
Grigoriev, S.A.; Bessarabov, D.G.; Fateev, V.N.; Millet, P. (Elsevier, 2020)Water electrolysis has various industrial applications. Over the past years, interest in water electrolysis technologies has increased largely due to the renaissance of the nuclear-hydrogen energy concept and also the ... -
Degradation mechanisms of MEA characteristics during water electrolysis in solid polymer electrolyte cells
Grigoriev, S.A.; Bessarabov, D.G.; Fateev, V.N. (Springer, 2017)The processes contributing to degradation of characteristics of membrane-electrode assemblies (MEA) of water electrolyzers with solid polymer electrolyte (SPE) are considered. Particularly, the life tests of an electrolysis ... -
Density functional theory calculation of Ti3C2 MXene monolayer as catalytic support for platinum towards the dehydrogenation of methylcyclohexane
Obodo, Kingsley Onyebuchi; Ouma, Cecil Naphtaly Moro; Modisha, Phillimon M.; Bessarabov, Dmitri (Elsevier, 2020)The need for sustainable energy systems and reducing greenhouse gas emissions are key drivers in the development of liquid hydrogen organic carriers (LOHCs). Density functional theory calculations were performed on the ... -
Design and operation of an ammonia-fueled microchannel reactor for autothermal hydrogen production
Chiuta, Steven; Bessarabov, Dmitri G. (Elsevier, 2018)The present work describes the design and operation of an autothermal microchannel reactor for portable and distributed hydrogen production via ammonia decomposition. The microreactor consists of an array of alternating ... -
Development of a controller for fuel cell and supercapacitor application
Rautenbach, H.J.; Gouws, R.; Bessarabov, D.; Kruger, A.; Human, G. (CATSA (Catalysis Society of South Africa), 2014)The growing demand for energy in the world causes a lot of pressure to the environment and the resources used to supply the energy. To ensure a continuous, more reliable and environmentally friendly energy supply system ... -
Development of a low purity aluminum alloy (Al6082) anodization process and its application as a platinum-based catalyst in catalytic hydrogen combustion
Kozhukhova, A.E.; Du Preez, S.P.; Shuro, I.; Bessarabov, D.G. (Elsevier, 2020)In this study, we present a process to prepare a Pt/anodized aluminum oxide (AAO) catalyst for catalytic hydrogen combustion applications using low cost and low aluminum (Al) purity Al6082 alloy (97.5% Al) as the substrate. ... -
Development of a Pt/stainless steel mesh catalyst and its application in catalytic hydrogen combustion
Du Preez, S.P.; Bessarabov, D.G.; Falch, A.; Jones, D.R.; Mota das Neves Quaresma, C. (Elsevier, 2019)In this paper, different methods to prepare a Pt/stainless steel mesh catalyst for catalytic hydrogen combustion are reported. Pt was deposited as a thin layer onto stainless steel mesh as a support matrix. Thermal treatment ...