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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 55 for “"H2 production"”.
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Catalysts for H2 production
The research of new catalysts for the hydrogen production described in this thesis was inserted within a collaboration of Department of Industrial Chemistry and Materials of University of Bologna and Air Liquide (Centre de Recherche Claude-Delorme, Paris). The aim of the work was focused on the …
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Carbon nitride for solar H2 production coupled to organic chemical transformations
… utilises solar-light for clean fuel H2 production and is emerging as a potential solution for renewable energy generation. Photocatalytic systems that combine a light harvester and catalysts in one-pot reactor are promising strategies towards this direction. Yet, most of the reported …
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OPERANDO X-RAY ABSORPTION SPECTROSCOPY STUDIES OF (PHOTO)ELECTRODE MATERIALS FOR H2 PRODUCTION/CONVERSION
… development of efficient and sustainable energy production and conversion technologies
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The Influence of Water Chemistry on H2 Production and Uptake during Anaerobic Iron Corrosion
… soluble constituents (Fe2+, PO43-, and NH4+) on H2 evolution during anaerobic iron corrosion. At pH 7.0 when sulfide was absent, variable Fe2+ did not have much influence on H2 release rates, whereas PO43- and NH4+ promoted H2 evolution. If present, soluble sulfide controlled H2 release rates in …
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Investigation of the conversion of fuels in the presence of solid oxygen carriers and the development of a plasma-assisted chemical looping system for H2 production
… of a plasma-assisted chemical looping system for H2 production’, presents the work of Yaoyao Zheng in the Department of Engineering, University of Cambridge, for the degree of Doctor of Philosophy. The thesis focused on chemical looping conversion of fuels, which employ oxygen carriers to supply …
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Photocatalytic sustainable processes for the H2 production by photoreforming of green organic substrates [Processo fotocatalitico sostenibile per la produzione di H2 dal fotoreforming di substrati organici green]
Nel XXI secolo, la crescente domanda di energia, possibilmente prodotta con fonti rinnovabili, ha reso necessario trovare fonti energetiche alternative all'uso dei combustibili fossili. In particolare, l'energia prodotta da fonti non rinnovabili ha causato gravi problemi ambientali, soprattutto un …
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Analytical evaluation of microplasma technologies for production of hydrogen fuel from water
A H2-based energy economy could alleviate fossil fuel environmental effects. Hydrogen is an ideal fuel because of its ultra-high energy density, availability in common sources like water, and lack of harmful combustion byproducts. However, H2 lacks global adoption as a fuel because virtually all H2 …
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Experimental investigation and analyses of continuous type hybrid photoelectrochemical hydrogen production systems
… energy infrastructure. When used in fuel cells, H2 is converted to water and it gives little or zero exhaust of greenhouse gases. For H2 economy to succeed, it needs to be produced in a clean, sustainable, reliable, and feasible way. The main objective of this study is to develop and investigate …
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MULTI-MODAL INTEGRATED CARBON DIOXIDE CAPTURE AND MINERALIZATION PATHWAYS FOR SUSTAINABLE HYDROGEN PRODUCTION
Scalable decarbonization efforts require the production of low-carbon hydrogen energy alternatives. Currently, more than 80% of hydrogen is produced via steam methane reforming (SMR) followed by water gas shift reaction (WGSR) pathway that produces significant CO2 emissions, regardless of the use …
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Biohydrogen production in Escherichia coli – a synthetic biology approach
In the 21st Century molecular hydrogen (H2) has become an essential industrial commodity. It is widely heralded as an exciting alternative to petroleum-based transportation fuels and also plays indispensable roles in many other important industrial processes, including hydrogenation of fats and …
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Collaborative Simulation of Reacting Flow and Controller in Chemical Looping Systems
… solutions for carbon capture and hydrogen (H2) production. They rely on interconnected reactors and oxygen carriers (OCs) to facilitate fuel conversion and inherent CO2 separation. However, current research methods provide limited insight into detailed in-reactor behaviours and system …
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Optimizing soybean water use and nitrogen fixation to improve productivity under climate change
… function of the rate of by-product hydrogen gas (H2) production by soybean nodules. A second goal was to examine rates of nitrogen fixation in relation to concurrent changes in environmental variables, namely VPD and temperature. The system was successfully tested on two soybean genotypes in both …
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Biohydrogen as a Fuel: Understanding and Engineering Hydrogenase Enzymes for Biotechnological Applications
Molecular hydrogen (H2) is seen as an ideal replacement for fossil fuels; however the current methods of its synthesis are unsustainable and environmentally damaging. Research is therefore needed to devise new, more suitable modes of H2 derivation. Biohydrogen – i.e. H2 derived from cellular …
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Labile Ligand Variation in Polyazine-Bridged Ruthenium/Rhodium Supramolecular Complexes Providing New Insight into Solar Hydrogen Production from Water
… were prepared for use as photocatalysts for the production of solar H2 fuel from H2O. The electrochemical, photophysical, and photochemical properties upon variation of the monodentate, labile ligands coordinated to the Rh reactive metal center were investigated. Bimetallic complexes …
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Solar Driven Hydrogen Generation with Dye-Sensitised CuCrO2 Photocathodes
… cells provide a platform for H2 generation from water. Fuel-forming photocathodes are currently limited by the small range of wide-bandgap p-type semiconductors available. The majority of previous reports have employed NiO, which displays low performance with immobilised dyes …
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Synthesis and Application of Tunable Mo2 and W2 Tetraguanidinate Paddlewheel Complexes
… donors can be used for applications from H2 production to difficult organic transformations like C–Cl bond cleavage and crosscoupling reactions. The goal of this research was to develop accessible syntheses of the ligands and complexes, to investigate high impact applications of the Mo2 …
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Use of a Purple Non-Sulphur Bacterium, Rhodopseudomonas palustris, as a Biocatalyst for Hydrogen Production from Glycerol
… palustris, as a biocatalyst for hydrogen production, from the waste of biodiesel manufacturing, crude glycerol. The goal of this project was to understand the fundamentals relevant to scaling up the process and developing an off the shelf product. The first objective was to determine the …
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Semi-biological domino catalysis using acetate- and propionate-producing microbes
… feedstock chemicals with applications in the production of polymers and food additives. The current production routes for both acetic acid and propionic acid in the chemical industry predominantly rely on fossil raw materials or agriculturally relevant crops as the carbon sources. Hence, …
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Redox kinetics study for chemical-looping combustion, water and CO₂ splitting using nickel and cerium-based oxygen carrier
… oxy-combustion for carbon capture, hydrogen production and CO2 reuse. In this process, oxygen carriers are utilized to cyclically adsorb and release oxygen producing two separated exhaust streams with desirable products. A rotary reactor design with micro-channel structure was developed in …
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New Polyazine-Bridged Ru(II),Rh(III) and Ru(II),Rh(I) Supramolecular Photocatalysts for Water Reduction to Hydrogen Applicable for Solar Energy Conversion and Mechanistic Investigation of the Photocatalytic Cycle
… photocatalysts for water reduction to H2 and provide mechanistic insights into the catalytic cycle. Two member of a new RuII,RhIII motifs with only one Rh-'Cl bond, [(bpy)2Ru(dpp)RhCl(tpy)](PF6)4 ( bpy = 2,2'-bipyridine, tpy = 2,2':6,2"-terpyridine) and [(bpy)2Ru(dpp)RhCl(tpm)](PF6)4, …
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