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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 43 for “"hydrogenolysis"”.
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The electrochemical hydrogenolysis of glucose
Previous investigators have studied the hydrogenolysis of sugars under high pressures and temperatures. The purpose of this investigation was to study the possibilities of producing low molecular weight polyhydric alcohols from glucose by electrochemical methods. A procedure was devised for the …
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Solvent Effects in the Hydrogenolysis of Allyl Phenyl Ether
No abstract prepared.
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Structure Sensitivity of Alkane Hydrogenolysis on Ir/MgAl₂O₄ Catalysts
… than 2nm were utilized for ethane and n-butane hydrogenolysis reactions to study the structure sensitivity effect as well as the potential reaction mechanism. The results show that the activity on the catalysts with nanoparticles and mostly single atoms is evidently higher than that with the …
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Structure Sensitivity of Alkanes Hydrogenolysis and Alkynes Hydrogenation on Supported Ir Catalysts
… particle sizes less than 3 nm were utilized for hydrogenolysis of n-butane and ethane to study the structure sensitivity as well as the potential reaction pathways. The results indicate that the activity of n-butane hydrogenolysis increases as Ir particle size increases in the small particle size …
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Synergistic coordination of oxygen functional groups with catalyst surface promotes hydrogenolysis of lignin model compounds
… the kinetics and mechanisms of the catalytic hydrogenolysis step of the RCF process to enable optimization of the process as a whole. We used synthetic archetype lignin model compounds to investigate the interactions between lignin substrates and the catalyst surface. Our study suggests lignin …
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Part I: The kinetics of thiophene hydrogenolysis. Part II: Effectiveness factors for porous catalysts: Langmuir-Hinshelwood kinetic equations.
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 1965
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Advancing plastics reutilization via catalytic hydroconversion
… processes, including hydrocracking and hydrogenolysis, are promising for chemical recycling polyolefins to C1-C30 alkanes that can be utilized in petroleum refineries. This thesis aims to develop high-performance catalysts for polyolefin hydroconversion, elucidate the reaction networks …
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Understanding the Kinetics and Mechanisms of the Desired and Undesired Reactions during Electrochemical Hydrogenation and Hydrogenolysis of Furfural on Copper in Acidic Media
… the electrochemical hydrogenation and hydrogenolysis of furfural on copper electrodes in acidic media to better understand the kinetics and mechanisms of the process. Two products are formed, furfuryl alcohol and 2-methylfuran. Furfuryl alcohol is used to produce resins for the foundry …
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CATALYTIC C-O BOND CLEAVAGE TO SELECTIVELY PRODUCE VALUABLE CHEMICALS FROM BIOMASS-DERIVED FURANIC COMPOUNDS USING NI-BASED CATALYSTS
C-O hydrogenolysis is a key reaction in upgrading biomass–derived heterocyclic compounds into high value chemicals. It is of great importance to develop catalytic systems for C-O hydrogenolysis based on non-noble metals due to the high cost and depleting resources of noble metals. In this thesis, …
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Bimetallic Catalyst for Lignin Depolymerization
… hydrogen via alcohol reforming and perform hydrogenolysis for lignin depolymerization at aryl-ether linkages. Process. However, the use of nickel in other catalytic systems suggest a nickel-doped catalyst might have a greater ability hydrogenolysis on aryl-ether linkages, further reducing …
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Tandem Double Intramolecular [4+2]/[3+2] Cycloaddition of Nitro Olefins: Part I: Construction of Piperidine Rings. Part II: Construction of Vicinal Quaternary Stereogenic Centers. Part III: Progress Toward a Total Synthesis of Daphnilactone B
… Ozonolysis of the cycloadducts, followed by hydrogenolysis and intramolecular acylation provided the intermediates for the total synthesis that may be elaborated to daphnilactone B. Possible routes to complete the synthesis are also discussed.
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Electrocatalytic Conversion of Carbon Dioxide to Value-Added Chemicals
… of the cathode by insoluble carbonate salts. Hydrogenolysis of the carbon-halide bond represents a major competing electrochemical reaction. The reactive hydrogen for this reaction was found to originate from the electrolyte solvent. Mechanistic studies revealed solvent deprotonation is the …
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Heterogeneous catalytic conversion of biomass to added-value biofuels and chemicals
… of deactivated/sintered catalyst in a hydrogenolysis reaction. Hence, this thesis reports the conversion of lignocellulosic biomass to added-value biofuels and chemicals using primarily platinum group and related metal catalysts on a range of supports. The major biofuels/biochemicals …
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Nitroalkene (4+2) cycloadditions of achiral and chiral vinyl ethers. The stereochemical consequence of the Lewis acid promoter and studies toward the total synthesis of (+)-pretazettine
… enantiomeric series of tandem cycloaddition/hydrogenolysis product is available from the chiral auxiliary of a single absolute configuration by judicious selection of the Lewis acid promoter, Ti(Oi-Pr)$\sb{2}$Cl$\sb{2}$ (98% ee, ($-$)) or methylaluminum bis-(2,6-diphenylphenoxide) (MAPh) (93% …
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Catalytic and magnetic properties of nanostructured materials generated by ultrasound
… catalytic selectivity in dehydrogenation and hydrogenolysis of cyclohexane. Nanophase Fe-Co alloys have been generated by ultrasonic irradiation of volatile organometallic precursors ($\rm Fe(CO)\sb5$ and $\rm Co(CO)\sb3(NO)$). The sonochemically prepared Fe, Co, and Fe-Co alloys have large …
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Electrochemical oxidation and reduction of 5-hydroxymethylfurfural in alkaline water electrolyzers
… that, in addition to the hydrogenation of HMF, hydrogenolysis is also possible under strongly alkaline conditions. The copper oxide-based mixed metal oxide catalysts are partially reduced to high-active metal oxide-derived catalysts under the investigated reaction conditions. In particular, …
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Control of regioselectivity:oxidation and deprotection
… method of choice for the removal of Bn groups is hydrogenolysis over a palladium catalyst. Oxidative deprotection methods are also available, particularly when the MPM (4-methoxybenzyl) group is used in place of Bn. The NAP (2-naphthylmethyl) protective group has recently been introduced and has …
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The asymmetric synthesis of (2S,3R)-capreomycidine and the total synthesis of capreomycin IB
… a single diastereomer of the glycinate adduct. Hydrogenolysis provides the optically pure acetal of α-formylglycine. Finally, the total synthesis of capreomyc in IB is described. The synthesis features the incorporation of the previously prepared (2S,3R)-capreomycidine. Additionally, the number …
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Hemiaminals : a new chemotype for organocatalysis
… products in high ee (77-84%). N-N bond hydrogenolysis using Raney Nickel and hydrogen, followed by oxidation to the lactam afforded the N -protected α-amino lactam in high enantioselectivity (78% and 8 6 %). In part II the development of a mild reduction of the N-N bond of the …
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