eubert mahofa

Monash University, Department of Mechanical and Aerospace Engineering, PhD Student

Jntuh, M.tech, Graduate Student

Harare Institute Of Technology, CHEMICAL AND PROCESS SYSTEMS ENGINEERING, Faculty Member

Monash University, Chemical Engineering, PhD Student

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Eubert is a PhD student at Monash University working on Graphene Oxide membrane synthesis and application in environmental contaminants (PFAS) from water. Eubert received a Bachelor of Technology Honours degree in CPSE from HIT, Zimbabwe, and a Masters of Technology in Chemical Technology from Jawaharlal Nehru Technological University of Hyderabad, India. His research interests span both chemical engineering and nanotechnology, including graphene oxide membranes and PFAS removal. He has published works on nano-catalytic soot oxidation in automobiles.

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The Potential of Carbon-Nano Based Electrical Energy Storage Systems to Upgrade the Solar Energy Generation in Zimbabwe

Efficient energy generation and utilization of both energy resources and energy by the end user w... more Efficient energy generation and utilization of both energy resources and energy by the end user will play a significant role in the socioeconomic development and generation of wealth in Zimbabwe. One of the most promising renewable energy source in the country is Solar Energy. In recent years, solar energy has received much attention as an easily utilizable energy source of electricity. If proper systems and technology are used, solar energy can provide an environmental friendly option and national energy security for a long-term sustainability of the Zimbabwean economy. This paper describes the potential of Advanced Solar Energy Generation by integrating Nano Carbon Electrical Energy Storage System to improve the energy sector in Zimbabwean perspective.

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Situational analysis for producing biomass charcoal briquettes in Zimbabwe

1,4E. Muzenda 1BioEnergy and Environmental Technology Centre, Department of Operations and Qualit... more 1,4E. Muzenda 1BioEnergy and Environmental Technology Centre, Department of Operations and Quality Management, Faculty of Engineering and the Built Environment, University of Johannesburg, South Africa 4Department of Chemical, Materials and Metallurgical Engineering, Faculty of Engineering and Technology, Botswana International University of Science and Technology, P. Bag 16, Palapye, Botswana emuzenda@uj.ac.za; muzendae@biust.ac.bw

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Catalytic Activity of CeO2-NiO for Low Temperature Soot Combustion

CeO 2 (Ce) and CeO 2-NiO (CeNi) nanocatalysts were synthesized by co-precipitation from nitrate p... more CeO 2 (Ce) and CeO 2-NiO (CeNi) nanocatalysts were synthesized by co-precipitation from nitrate precursors using 25% ammonia solution (NH 4 OH) as the precipitating agent. The catalysts were calcined in air at 500 ºC and 800ºC for 4h to evaluate the thermal stability. XRD and DLS techniques were used for catalyst characterization. A Thermo gravimetric/Differential Thermal Analyzer (TG/DTA) was used to determine the catalytic activity and soot oxidation reactions. Compared with Ce, Ce-Ni nanocomposite showed lower soot oxidation temperature.

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Catalytic Removal of Soot from Diesel Engines Using CeO2, CeO2-CuO2, and CeO2-Al2O3 Nanocomposites

Materials Today: Proceedings, 2015

Nanosized CeO2-CuO2 (CeCu, 2:1) and CeO2-Al2O3 (CeAl, 2:1) were synthesized by co-precipitation f... more Nanosized CeO2-CuO2 (CeCu, 2:1) and CeO2-Al2O3 (CeAl, 2:1) were synthesized by co-precipitation from nitrate precursors using ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 500°C for 4 h to evaluate the thermal stability. The techniques including XRD and DLS were used for catalyst characterization. A Thermo gravimetric/Differential Thermal Analyzer (TG/DTA) was used to determine the catalytic efficiency and soot oxidation reactions. Compared with Ce-free sample, Ce-composite increases the redox properties and the amount of surface lattice oxygen species of the catalyst. The Ce-composite samples exhibited excellent soot catalytic combustion performance by decreasing activation energy of soot oxidation.

Licensed Under Creative Commons Attribution CC BY Structural Characteristics and Catalytic Performance of CeAl Nanoparticles in Soot Oxidation

Abstract: CeO2-Al2O3 mixed oxide was prepared by co-precipitation from nitrate precursors using 2... more Abstract: CeO2-Al2O3 mixed oxide was prepared by co-precipitation from nitrate precursors using 25 % ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 500 ºC and 800ºC for 4h to evaluate the thermal stability and compare catalytic activity. The catalysts were characterized by XRD and DLS techniques. Catalytic activity was determined using a Thermo gravimetric/Differential Thermal Analyzer (TG/DTA). CeAl nanosized catalysts calcined at 500ºC exhibited superior redox properties of the catalyst relative to the one calcined at 800ºC. The Ce-Al composite samples exhibited good soot catalytic combustion performance by decreasing soot oxidation temperature.

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— CeO2 (Ce) and CeO2-NiO (CeNi) nano-catalysts were synthesized by co-precipitation from nitrate ... more — CeO2 (Ce) and CeO2-NiO (CeNi) nano-catalysts were synthesized by co-precipitation from nitrate precursors using 25 % ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 500 ºC and 800ºC for 4h to evaluate the thermal stability. XRD and DLS techniques were used for catalyst characterization. A Thermo gravimetric/Differential Thermal Analyzer (TG/DTA) was used to determine the catalytic activity and soot oxidation reactions. Compared with Ce, Ce-Ni nanocomposite showed lower soot oxidation temperature.

Catalytic Soot Oxidation Using Ceria, Cobalt And Copper Nanocomposites

MRS Advances, 2018

ABSTRACTNanosized CeO2-CuO (CeCu, 2:1) and CeO2-CoO (CeCo, 2:1) were synthesized by co-precipitat... more ABSTRACTNanosized CeO2-CuO (CeCu, 2:1) and CeO2-CoO (CeCo, 2:1) were synthesized by co-precipitation from nitrate precursors using 25% ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 800°C for 4h to evaluate the thermal stability. Powder x-ray diffraction (XRD) and Dynamic Light Scattering (DLS) techniques were used for catalyst characterization. A Thermo Gravimetric/Differential Thermal Analyzer (TG/DTA) was used to determine the catalytic efficiency and soot oxidation activity. Ce-composite nanoparticles heightens the redox properties of the catalyst relative to undoped ceria. The Ce-composite samples exhibited excellent soot catalytic combustion performance by decreasing activation energy of soot oxidation.

Ethanol Production via Dilute Acid Hydrolysis of Physically Pre-Treated Switchgrass

The proposed design utilises 3350 tonnes per year of switchgrass obtained from local farms and fo... more The proposed design utilises 3350 tonnes per year of switchgrass obtained from local farms and forests around Zimbabwe. Switchgrass is non-edible lignocellulosic biomass that contains cellulose, hemicellulose, lignin and ash on a dry basis and has a tendency to replace the use of edible sources. The cellulose and hemicellulose present in switchgrass can be hydrolysed chemically to form glucose and xylose. Physically treated switchgrass was digested by dilute acid at a temperature of 180°C for 2hrs for effective hydrolysis. Calcium oxide is then added to neutralise the slurry and it reacts with sulphuric acid to form Calcium sulphate (gypsum). Sugars are then fermented in the presence of yeast for 24hrs at room temperature to produce ethanol. The conversion of ethanol is 62.3% per kg of glucose and xylose. The slurry is filtered removing gypsum (CaSO4) and the filter cake at a constant pressure rate. The filtrate is then distilled to separate water and ethanol. 1 172 500 litres of ethanol are produced per year with an initial total capital investment of USD$2.1million as well as annual fixed and variable costs amounting to $1.065million.The project has a pay-back period of 2.78years and a return on investment of 35.9%. Profit will be added by selling of by-products produced from the process such as dried cake and gypsum

Structural Characteristics and Catalytic Performance of CeAl Nanoparticles in Soot Oxidation

CeO2-Al2O3 mixed oxide was prepared by co-precipitation from nitrate precursors using 25% ammonia... more CeO2-Al2O3 mixed oxide was prepared by co-precipitation from nitrate precursors using 25% ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 500 oC and 800oC for 4h to evaluate the thermal stability and compare catalytic activity. The catalysts were characterized by XRD and DLS techniques. Catalytic activity was determined using a Thermo gravimetric/Differential Thermal Analyzer (TG/DTA). CeAl nanosized catalysts calcined at 500oC exhibited superior redox properties of the catalyst relative to the one calcined at 800oC. The Ce-Al composite samples exhibited good soot catalytic combustion performance by decreasing soot oxidation temperature.

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Magnetite nanoparticles (Fe3O4) synthesis for removal of Chromium (VI) from waste water

In this study adsorption behavior of Cr(VI) investigated by high adsorption iron oxide (Fe3O4) na... more In this study adsorption behavior of Cr(VI) investigated by high adsorption iron oxide (Fe3O4) nanoparticle under experimental conditions of the initial concentration and pH of chromium hexavalent by Fe3O4 nanoparticles from waste water. Magnetite nanoparticles synthesized by sol-gel method and characterized by UVVisible spectroscopy, XRD, EDAX, SEM and TEM. The adsorption efficiency was explained in terms of Freundlich equation. In this study we conclude that magnetite (Fe3O4) have potential in removal of chromium hexavalent from waste water.

Catalytic Removal of Soot from Diesel Engines Using CeO2, CeO2-CuO2, and CeO2-Al2O3 Nanocomposites

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Catalytic Activity of CeO2-NiO for Low Temperature Soot Combustion

CeO2 (Ce) and CeO2-NiO (CeNi) nanocatalysts were synthesized by co-precipitation from nitrate pre... more CeO2 (Ce) and CeO2-NiO (CeNi) nanocatalysts were synthesized by co-precipitation from nitrate precursors using 25% ammonia solution (NH4OH) as the precipitating agent. The catalysts were calcined in air at 500ºC and 800ºC for 4h to evaluate the thermal stability. XRD and DLS techniques were used for catalyst characterization. A Thermo gravimetric/Differential Thermal Analyzer (TG/DTA) was used to determine the catalytic activity and soot oxidation reactions. Compared with Ce, Ce-Ni
nanocomposite showed lower soot oxidation temperature.

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Magnetite nanoparticles (Fe3O4) synthesis for removal of Chromium (VI) from waste water

by eubert mahofa and Shilpa Chakra

In this study adsorption behavior of Cr(VI) investigated by high adsorption iron oxide (Fe3O4) na... more In this study adsorption behavior of Cr(VI) investigated by high adsorption iron oxide (Fe3O4) nanoparticle under experimental conditions of the initial concentration and pH of chromium hexavalent by Fe3O4 nanoparticles from waste water. Magnetite nanoparticles synthesized by sol-gel method and characterized by UV- Visible spectroscopy, XRD, EDAX, SEM and TEM. The adsorption efficiency was explained in terms of Freundlich equation. In this study we conclude that magnetite (Fe3O4) have potential in removal of chromium hexavalent from waste water.

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Structural Characteristics and Catalytic Performance of CeAl Nanoparticles in Soot Oxidation

by eubert mahofa and Dr. T. Bala Narsaiah T

CeO2-Al2O3 mixed oxide was prepared by co-precipitation from nitrate precursors using 25% ammonia... more CeO2-Al2O3 mixed oxide was prepared by co-precipitation from nitrate precursors using 25% ammonia solution (NH4OH) as
the precipitating agent. The catalysts were calcined in air at 500 ºC and 800ºC for 4h to evaluate the thermal stability and compare catalytic activity. The catalysts were characterized by XRD and DLS techniques. Catalytic activity was determined using a Thermogravimetric/Differential Thermal Analyzer (TG/DTA). CeAl nanosized catalysts calcined at 500ºC exhibited superior redox properties of the catalyst relative to the one calcined at 800ºC. The Ce-Al composite samples exhibited good soot catalytic combustion performance by decreasing soot oxidation temperature.

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