Global ETD Search
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 27 for “"Hydrodeoxygenation"”.
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Carboxylic Acid Hydrodeoxygenation over Supported Noble Metal Catalysts
<p>Carboxylic acid hydrodeoxygenation (HDO) over supported noble metal catalysts was carried out in order identify the main challenges associated with supported monometallic catalysts and identifying solutions that may increase the practicality of these high activity metals. Using propionic acid as …
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Catalytic Hydrodeoxygenation of Guaiacol over Noble Metal Catalysts
… an upgrading process is required. Catalytic hydrodeoxygenation (HDO) is a rapidly developing technology for oxygen removal from pyrolysis bio-oils and noble metal catalysts have shown promising activities, especially as compared to the traditional hydrodesulphurization catalysts (e.g. …
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Catalytic hydrodenitrogenation and hydrodeoxygenation of model compounds in a trickle bed reactor
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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Molybdenum trioxide and molybdenum carbide as promising hydrodeoxygenation catalysts for biomass conversion
… earth-abundant cheap catalysts that perform hydrodeoxygenation (HDO) at relatively low temperatures ( 673 K) and ambient H2 pressures wherein oxygen is selectively removed as water. However, there exists a significant knowledge gap in understanding the stability and the active phases …
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Novel Carbon-supported Transition Metal Phosphide Catalysts for Hydrodeoxygenation of Fast Pyrolysis Oil
Catalytic hydrodeoxygenation (HDO) is considered to be the most promising route to upgrade pyrolysis oil to liquid transportation fuels. The objective of this research was to explore inexpensive supported metal oxides/metal phosphide catalysts for the upgrading of pyrolysis oil into advanced …
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Synthesis, characterization and activity evaluation of phosphate-modified hydroprocessing catalysts for benzofuran hydrodeoxygenation
Includes bibliographical references (pages 171-177).
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Effects of phosphorus on bond rupture during hydrodeoxygenation and dehydrogenation reactions on ruthenium
… and active towards C-O bond rupture during hydrodeoxygenation (HDO) of oxygenates, making them potential candidates for bio-oil upgrading. However, the mechanism by which the C-X (X = O, C, H) bond ruptures and the corresponding intrinsic barriers (i.e., for C-H, C-C, and C-O bond rupture) …
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Catalytic upgrading of biomass through the hydrodeoxygenation (HDO) of bio-oil derived model compounds
… transition metal oxide catalysts for selective hydrodeoxygenation (HDO) of bio-oil derived model compounds using reactivity, computation and characterization studies. The first section focuses on developing structure-reactivity relationships on bulk and supported MoO₃ catalysts for the HDO of …
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Catalytic hydrodeoxygenation of dibenzofuran in a trickle bed reactor : kinetics, poisoning, and phase distribution effects
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1988.
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Catalytic Hydrodeoxygenation of Bio-Oil Model Compounds (Ethanol, 2-Methyltetrahydrofuran) over Supported Transition Metal Phosphides
The objective of this project is to investigate hydrodeoxygenation (HDO), a crucial step in the treatment of bio-oil, on transition metal phosphide catalysts. The study focuses on reactions of simple oxygenated compounds present in bio-oil -- ethanol and 2-methyltetrahydrofuran (2-MTHF). The …
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Lab-scale fast-hydropyrolysis and vapor-phase catalytic hydrodeoxygenation for producing liquid fuel range hydrocarbons from intact biomass
… that are catalytically upgraded in downstream hydrodeoxygenation (HDO) to produce hydrocarbons. This process has been modeled to have high carbon and energy efficiencies of ~70% and ~75%, respectively.</p> <p>This dissertation presents the results of a lab-scale experimental proof-of-concept …
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Identities and Catalytic Functionalities of Reactive Hydrogen Species during Hydrogen Addition and Oxygen Removal Reactions of Carboxylic Acids, Carbonyls, and Phenols at Transition Metal-solvent Interfaces
… These H species participate in or assist with hydrodeoxygenation of phenolics and carbonyls to produce alkanes and alkanols; yet their specific identities and catalytic functions remain unclear. This thesis interrogates the origin, chemical identities, and electronic charge of reactive H …
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High-Pressure Vapor-Phase Catalytic Hydrodeoxygenation of Lignin-Derived Compounds to Hydrocarbons on Bimetallic Catalysts in the Range of 0.2-2.4 MPa.
… fuels and chemicals via high-pressure catalytic hydrodeoxygenation (HDO) of the lignin-derived fraction of biomass. Catalytic HDO is performed as a second-stage process to upgrade the intermediate lignin-derived oxygenates produced in first-stage processes such as: the H2Bioil …
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High Pressure Micro-Scale Studies of Fast-Hydropyrolysis and Catalytic Hydrogenation of Biomass and Related Model Compounds
… Fast pyrolysis of biomass followed by catalytic hydrodeoxygenation of bio-oil is considered a promising biomass conversion route to produce drop in hydrocarbon fuels. The H2Bioil process was proposed as an integrated high pressure fast hydropyrolysis and catalytic vapor phase hydrodeoxygenation …
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Kinetic Studies of Model Reactions to Transform Biomass into Fuels
… of the thermal depolymerization and catalytic hydrodeoxygenation reactions to optimize the overall process. This dissertation describes the experimental work using model compounds to elucidate the role of bimetallic catalyst and control the reaction operating parameters such as temperature and …
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Kinetic Studies of Model Reactions to Transform Biomass into Fuels
… of the thermal depolymerization and catalytic hydrodeoxygenation reactions to optimize the overall process. This dissertation describes the experimental work using model compounds to elucidate the role of bimetallic catalyst and control the reaction operating parameters such as temperature and …
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Revisão da literatura: desoxigenação catalítica de ácidos graxos e derivados – síntese de bio-óleo.
… of fuels from biomass. The Pyrolysis and Hydrodeoxygenation (HDO) consist a feasible route for production of bio-fuels in industrial scale, together to conventional fuels and compatible with the infrastructure as we know. However, the competitiveness of this route is still far from …
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Development of Heterogeneous Catalysts for Upgrading Biomass Pyrolysis Bio-Oils into Advanced Biofuels
… from biomass pyrolysis. Catalytic cracking and hydrodeoxygenation (HDO) are two most promising bio-oil upgrading techniques for biofuel production. Heterogeneous catalysts are essential for upgrading bio-oil into hydrocarbon biofuel. Although some progresses have been made, the cost and …
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METAL NANOMATERIALS: SYNTHESIS, DESIGN, AND APPLICATIONS
… supported on silicon spheres and realize the hydrodeoxygenation reaction of vanillin under mild conditions.First, we used bismuth as an example to study the shape-controlled synthesis of metal nanocrystals by adjusting the injection temperature and the added halide ions (e.g., Cl-, Br-). Our …
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Zeolite supported/non-noble metal catalysts for the deoxygenation of fatty acids to transportation fuels
… precious metal components. Also, sulfided metal hydrodeoxygenation catalysts have been tested, but present low stability in humid environments. Thus, researchers have searched for non-noble metal catalysts employing carbon, silica, alumina, titania, and zeolites as supports. Zeolites are of …
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