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.
Results
Showing 1 to 20 of 26 for “"Noble Metal Catalysts"”.
-
Carboxylic Acid Hydrodeoxygenation over Supported Noble Metal Catalysts
… 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 a probe …
-
Catalytic Hydrodeoxygenation of Guaiacol over Noble Metal Catalysts
… 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. CoMo/Al2O3 and NiMo/Al2O3). However, further understanding and development of the catalysts through improving …
-
Synthesis and Activation of Nanoscale Dendrimer-Derived Supported Noble Metal Catalysts
… as templates for the preparation of supported metal catalysts. This approach takes advantage of several unique characteristics of these dendrimers such as the ability to complex metal cations in solution and to protect them from aggregation until they are impregnated onto a support. After the …
-
Water-gas shift conversion in microchannel reactors using noble metal catalysts
… conditions and in on/off mode. This requires catalysts that are stable with respect to occasional contact with air and condensation of the steam co-fed with the primary fuel and which do not require any activation or other conditioning prior to restart. Only noble metal based catalysts meet …
-
Zeolite supported/non-noble metal catalysts for the deoxygenation of fatty acids to transportation fuels
… gasoline range hydrocarbons over heterogeneous catalysts. Active areas of development in the valorization of fatty acids include: one-pot continuous conversion of both saturated and unsaturated fatty acids, employing non-noble metals as cheaper catalysts, and decreasing the intensity of reaction …
-
INFLUENCES OF INTERFACES AND PROMOTERS ON THE WATER-GAS SHIFT REACTION OVER SUPPORTED NOBLE METAL CATALYSTS
The water-gas shift reaction (WGS) is an important reaction to produce high purity
-
Selective hydrogenation of α,β[alpha,beta]-unsaturated aldehydes towards clean synthesis over noble metal catalysts in mass transfer efficient three phase reactors
… and commercial palladium, platinum and ruthenium catalysts was carried out in stirred tank reactors and cocurrent downflow reactors in order to study the kinetics and mass transfer characteristics and the selectivity towards the corresponding desired product, hydrocinnamaldehyde or cinnamyl …
-
Transition metal carbide and nitride nanoparticles with Noble metal shells as enhanced catalysts
… design platform for enhancing the performance of noble metal catalysts while reducing the cost. Early transition metal carbides (TMCs) and nitrides (TMNs) have been identified as ideal core materials for supporting noble metal shells owing to their earth-abundance, thermal and chemical stability, …
-
Development of a semi–empirical reaction kinetic model for PEM fuel cells
… of PEFCs is therequirement for expensive noble metal catalysts (platinum and ruthenium). Furthermore 75% of the overpotential losses at the cathode are due to the activation of the oxygen reduction reaction (ORR). To reduce the platinum content requirements and understand the cause of the …
-
Catalytic properties, densification and mechanical properties of nanocrystalline yttria-zirconia-based materials
… for methane combustion. These novel catalysts were very active and thermally stable. In particular, 25 wt% Mn203-coated 7YZ and 25 wt% Mn203-doped 7YZ showed remarkably low light-off temperatures of 3750C and 3580C, respectively. These catalysts were highly attractive as they were …
-
Mechanism of oxygen reduction reaction on transition metal oxide catalysts for high temperature fuel cells
… energy landscape. Although SOFCs do not require noble metal catalysts, it has the disadvantage of having to operate at elevated temperatures (>800°C) due to the poor catalytic activity of the oxygen reducing cathode. This thesis research is focused on identifying the fundamental reaction …
-
Microfluidic H2/O2 fuel cells for contaminant and electrode analysis
… media and the ability to use inexpensive non-noble metal catalysts. However, carbonate formation from carbon dioxide in air has long been considered a significant hurdle for liquid electrolyte-based AFC technologies. Carbonate formation consumes hydroxyl anions, which leads to (i) reduced …
-
Engineering carbide nanoparticles coated with noble metal monolayers for catalysis
The noble metals (NMs) comprise ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), osmium (Os), iridium (Ir), platinum (Pt), and gold (Au). Together, these corrosion-resistant elements serve as nature's universal catalysts by binding reactant molecules neither too strongly nor too weakly. …
-
Design and Mechanism Study of Electrocatalysts for Alkaline Hydrogen Evolution
… problem. Consequently, most of the alkaline HER catalysts, especially the highly cost-effective non-noble metal catalysts, are still inefficiently designed based on trial and error methods. This lack of knowledge surrounding the alkaline HER has not only affected the development of hydrogen-based …
-
Ideal hydrocracking catalysts for the conversion of FT wax to diesel
… FT process occurs only when the activity of the metal is high and the rate limiting step occurs on the acid site. Integrating the wax synthesis process with the subsequent work up of the wax to produce distillate fuels is not without challenges, mainly the low reaction temperature and pressure …
-
Investigation of contaminant effects and cathode catalysts in microfluidic fuel cells
… due to the improved stability of inexpensive non-noble metal catalysts. H2 fuel is conventionally used due to its fast oxidation kinetics, but alternate liquid or solid fuels (e.g., methanol, ethanol, NaBH4, ethylene glycol) are being studied to achieve higher energy density. Major limitations for …
-
Design and fabrication of non-noble-metal electrocatalysts for oxygen reduction reactions.
… emission. However, a current fuel cell requires noble-metal catalysts (in most cased platinum, Pt) to accelerate the electrode reactions. As a result of the high cost of Pt, the commercialization of fuel cell has been severely hindered. Thus, it is exceptionally important to search for an …
-
The suitability of Ni-Co catalysts in the dry reforming reaction
… carbon which causes catalyst deactivation. Noble metal catalysts such as ruthenium and rhodium have shown great promise as dry reforming catalysts because of their resistance to carbon formation, but they are expensive making their use on an industrial scale unlikely. This has led to …
-
Designing Electrocatalysts for the Production and Oxidation of Liquid Fuels
… of these processes. As such, discovering new OER catalysts with high activity and stability would have wide-spread impacts. On the other hand, one of the most promising renewable fuel sources is methanol, which boasts about 3 times the energy density of hydrogen and can be used as an alternative …
-
Catalytic hydrofunctionalization and small molecule reactivity at a low-valent cobalt center supported by a bis(carbene) CCC pincer ligand
The ubiquity of noble metal catalysts in both industrial and academic settings is a testament to their impressive reactivity, versatility, and modularity. Recent advances in cross-coupling catalyses have principally been achieved with this privileged class of compounds, in large part due to the …
Page 1 of 2