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 16 of 16 for “"Metal-carbide"”.
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Carbon Supported Metal Carbide Catalysts for the Reduction of Carbon Dioxide
… aim of this research was to prepare a molybdenum-carbide catalyst from petroleum coke (petcoke), an abundant waste material from oil refining, with comparable activity and selectivity to other catalysts studied for the reduction of CO2 by H2. The process of converting petcoke into a catalyst …
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Low temperature deposition of metal carbide films from single source precursors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1994, and Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Materials Science & Engineering, 1994.
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Transition metal carbide and nitride nanoparticles with Noble metal shells as enhanced catalysts
… 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, …
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Biofuels production from hydrotreating of vegetable oil using supported noble metals, and transition metal carbide and nitride
… hydrotreating catalysts, supported noble metal and transition metal carbide/ nitride, and evaluate their hydrocracking activities and selectivities by using soybean oil as the feedstock. For comparison study, catalytic cracking of soybean oil over a commercialized ZSM-5 was investigated. …
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Sol-gel deposition of oxide-ion conducting thin films ; and, Liquid precursors to hafnium and tantalum carbides
… and the acetate or alkoxide of the dopant metal (Me). Copper-doped films were spincoated onto nonporous quartz substrates and pyrolyzed. These were initally defect-free, but became agglomerated on heating at higher temperatures. The use of a number of different additive compounds was tried, …
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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. …
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Synthesis and Chemical Bonding of Lithium and Alkaline-Earth Metal-based Carbometallates
Organometallic molecules of nickel and palladium are typically employed as catalysts. Carbometallates are promising precursors for the synthesis of such organometallic compounds. Transition metal-to-carbon bonds are generally difficult to form in a typical organometallic synthesis. However in the …
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Preparation, Separation, Characterization and Hydrogenation of Endohedral Metallofullerenes
Endohedral metallofullerenes (EMFs) have attracted increasing attention during past decades due to their novel structures and potential applications in a variety of fields such as biomedical applications and molecular electronics. This dissertation addresses the structural characterization and …
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The impact of coating architecture on the hardness, friction and wear resistance of hard and tribological nanocomposite coatings
… coatings presented in this thesis include carbides that form a solid solution (Ti-Hf-C) as well as carbides that form composite microstructures (WC-SiC, HfC-SiC). Hardness measurements on these films indicated the potential of transition metal carbide-silicon carbide composites to be …
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The chemistry of metal-containing molecules in the circumstellar envelopes of late-type stars: Millimeter-wave observations and abundance modeling
… conducted in order to investigate the role of metal-containing compounds in the circumstellar envelopes surrounding these objects. The role of metal bearing molecules in the chemical evolution of these envelopes was also examined. These studies have led to the detection of a new interstellar …
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Metal Dusting of Heat-Resistant Alloys
Metal dusting leads to disintegration of such alloys as iron and nickel-based into a “dust” of particulate metal, metal carbide, carbon, and/or oxide. It occurs in strongly carburising environments at 400-900°C. Literature survey has shown that alloys behave differently in metal dusting conditions …
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Synthesis and characterization of transition metal nitrides and carbides for catalysis and electrochemistry application
… cellulose, sucrose, glucose and lignin) towards metal (Ni0), metal alloy (Pd0.9Ni0.1, Pd0.5Ni0.5, Fe0.5Ni0.5, Cu0.5Ni0.5 and W0.15Ni0.85) and ternary carbide (Mn0.75Fe2.25C) nanoparticles embedded in carbon. In the interest of battery application, MnN0.43 nanoparticles surrounded by a graphitic …
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Biofuels Production Via Catalytic Hydrocracking Of Ddgs Corn Oil And Hydrothermal Decarboxylation Of Oleic Acid Over Transition Metal Carbides Supported On Al-Sba-15
… grains with solubles (DDGS) corn oil over bimetallic carbide catalysts was explored for green diesel production. A catalyst composed of nickel−tungsten (Ni−W) carbide supported on Al-SBA-15 was designed based on the ability of nickel to adsorb and activate hydrogen and the potential of …
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Cellulose based transition metal nano-composites : structuring and development
… cellulose, to synthesise a variety of metal and metal carbide nanoparticles and to establish structuring and patterning methodologies that produce highly functional nano-hybrids. To achieve this, the mechanisms governing the catalytic processes that bring about graphitised carbons in …
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Yttrium, Gadolinium, and Lutetium Based Endohedral Metallofullerenes: From Synthesis to Application
Endohedral metalofullerenes (EMFs) have emerged as an important class of nanomaterials with vast promise in applications of molecular devices and nanomedicines. This dissertation addresses the EMF research span from synthesis to application, with an emphasis of work on trimetallic nitride template …
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Multilayer solar selective coatings for high temperature solar applications: from concept to design
… Dresden - Rossendorf) and the SME Metal Estalki. The improvement in efficiencies in solar thermal energy plants partially means the increase in the receivers’ temperature, reaching up to an average maximum temperature of 650ºC for superheated steam and molten salts receivers. There …