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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 293 for “"Hydrogen production"”.
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Hydrogen production via plasma reformers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Mesophilic Fermentative Hydrogen Production from Biomass
Hydrogen is considered a possible alternative to fossil fuels. Hydrogen can be produced through dark fermentation with 1 mol hexose yielding a maximum of 4 mol hydrogen in association with acetate production, and 2 mol hydrogen in association with butyrate production. However, an economically and …
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Monolith Catalyst Supports for Hydrogen Production
… arc conducted on alternative energy sources. Hydrogen fuel cells arc one of the desired alternatives. The CCT Catalysis Institute has demonstrated the entire hydrogen production process from propane (LPG) reforming. This is aimed for off-grid and backup pOver supply to rural areas and …
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Mesophilic fermentative hydrogen production from sewage biosolids
… our environment has led to a renewed interest in hydrogen as a clean, sustainable, alternative energy vector. Using sewage biosolids as the substrate for fermentative hydrogen production offers several advantages over the use of other biomass sources. It is available at little or no cost and is …
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Routes towards low-cost renewable hydrogen production
… the most significant challenges facing humanity. Hydrogen is anticipated as the key future energy vector. This is sought to bring more value and utility to renewable energy resources, and eventually providing an energy storage medium to replace fossil fuels such as for automotive applications. …
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Ceramic Microreactors for on-Site Hydrogen Production
… these novel ceramic microreactors for on-site H2 production was performed using the decomposition of ammonia and the steam reforming of propane at temperatures as high as 1000°C. As much as 50 sccm of H2 can be produced per cm3 reactor, equivalent to 9.8x104 sccm H2 per cm3 of monolith or …
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Dynamic simulation of nuclear hydrogen production systems
Nuclear hydrogen production processes have been proposed as a solution to rising CO 2 emissions and low fuel yields in the production of liquid transportation fuels. In these processes, the heat of a nuclear reactor is used to run the chemical reactions in a hydrogen plant. The resulting system is …
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Development of supported nanocatalysts for hydrogen production technologies
… development of nanocatalysts for two different hydrogen production technologies is described. In the first part, a series of supported Ni-Co catalysts were tested for activity in the catalytic partial oxidation of methane to hydrogen/syngas. A 2 wt.% Ni 1 wt.% Co bimetallic catalyst was found to …
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Development of novel photocatalysts for solar hydrogen production
… semiconductors, can be used to split water into hydrogen and oxygen. If solar light is used for this, it opens the possibility of a renewable source of hydrogen. However, extension of photocatalytic response into the visible region of the solar spectrum is required. A new visible light activated …
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Conceptual design of nuclear systems for hydrogen production
Demand for hydrogen in the transportation energy sector is expected to keep growing in the coming decades; in the short term for refining heavy oils and in the long term for powering fuel cells. However, hydrogen cannot be harvested from natural sources like other fuels, it must be industrially …
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On-Site Hydrogen Production via Distributed Methane Pyrolysis
Current clean hydrogen production technologies are most affordable as large-scale centralized facilities, but current transportation and storage options can make hydrogen cost-prohibitive for small-scale and intermittent consumers. For these customers, a distributed hydrogen production method may …
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The economics of biological methods of hydrogen production
The costs to produce and utilize hydrogen are extremely high per unit of energy when compared to fossil fuel energy sources such as natural gas or gasoline. The cheapest hydrogen production approaches today are also the most polluting, as they use fossil fuels in even more inefficient ways than …
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Investigation of sustainable hydrogen production from steam biomass gasification
Hydrogen is a by-product of the gasification process and it is environmentally friendly with respect to pollution and emission issues when it is derived from a CO2-neutral resource such as biomass. It is an energy carrier fuel and has flexibility to convert efficiently to other energy forms to be …
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Hydrogen production via dark fermentation of carbohydrate-rich substrates
Hydrogen could replace fossil fuels for power generation and transportation and contribute to a low carbon economy. However, current methods of producing hydrogen e.g. steam methane reformation of natural gas are not sustainable and also contribute to CO<sub>2</sub> emissions.<br/><br/>Dark …
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Photosynthetic hydrogen production from the green alga Chlamydomonas reinhardtii
Includes bibliographical references (pages 119-134).
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Ruthenium and Cobalt Catalysts for Hydrogen Production from Ammonia
… use as a fuel or fully cracked for use in a hydrogen fuel cell. In both cases, catalytic ammonia cracking is paramount to release hydrogen on demand and avoid NOx formation. Currently, the benchmark catalyst for ammonia cracking is ruthenium supported on carbon nanotubes (CNT). Future …
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Supercritical water gasification of lignocellulosic biomass materials for hydrogen production
… significant factor that influenced the yields of hydrogen and total gas yield. Among the three model compounds, hydrogen yields increased in the order of lignin (0.73 mmol/g) < cellulose (1.95 mmol/g) < xylose (2.26 mmol/g). Based on the gas yields from these model compounds, a reaction pathway of …
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Development of metallic catalysts for hydrogen production from metal hydrides
Al giorno d'oggi, le celle a combustibile a membrana a scambio protonico (PEMFC), che utilizzano l'idrogeno come combustibile, sono considerate una delle alternative più promettenti ai motori a combustione. Per un corretto funzionamento di una PEMFC, è necessario un accumulo di idrogeno sicuro e …
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