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Showing 1 to 20 of 36 for “"methanol oxidation"”.
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Bimetallic Electrocatalysts on TiO2 -Based Supports for Methanol Oxidation and Oxygen Evolution
… and ruthenium, as electrocatalysts. For the methanol oxidation and oxygen evolution reaction, a bimetallic structure can be used to enhance kinetics and increase stability. It is desired to support electrocatalysts to disperse nanoparticles on the surface and promote better catalyst …
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Understanding and controlling the reactivity of oxygen reduction and methanol oxidation electrocatalysts
… reaction (ORR) at the fuel cell cathode and the methanol oxidation reaction (MOR) at the anode serve as prime examples of electrocatalytic reactions requiring deeper mechanistic insights and advancements in effective electrocatalysts. Chapter 1 presents the essential background pertinent to the …
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Pyridine Modified Gold Nanoparticles for Electrocatalytic Carbon Dioxide Reduction and Methanol Oxidation Reactions
… into chemical fuels (e.g., CO, CH4, and methanol) by electrochemical reduction reaction. Catalysts play critical roles in enhancing the selectivity and lowering the overpotential of the CO2 reduction reaction. For example, the main product of the carbon dioxide reduction reaction with the …
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Morphology Controlled Synthesis of Copper Based Multimetallic Nanostructures and Their Electrocatalytic Properties for Methanol Oxidation Reaction
… and their electrocatalytic properties for methanol oxidation reaction (MOR). Copper nanomaterials (Cu NM) with specific surface facets can tailor their catalytic activity. Understanding reagents responsible for Cu NM growth is important for morphology-controlled synthesis of the …
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Characterization of Platinum-Based Heterogeneous Electrocatalysts and Catalysis Modeling
… investigating current densities obtained from methanol oxidation, osmium apparently promoted the reaction on a platinum surface. However, osmium is a less effective promoter on a Pt(111) surface than ruthenium at low potentials, advantageous for fuel cell application.
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Preparation and Catalytic Properties of Supported Nanoscale Metal Particles
… were active catalysts for the decomposition of methanol to CO and H$\sb2,$ but the catalyst derived from $\rm Pt\sb2Ru\sb4(CO)\sb{18}$ displayed enhanced activity and stability. The behavior of these materials as thermal catalysts is expected to relate to their behavior as electrooxidation …
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Investigation of the potential catalytic activities of several metal organic framework (MOF) materials
… are tested from the water gas shift and methanol oxidation reactions using a fixed bed flowing reactor at 1 atm. The characterization results show that these MOFs decompose at relatively low temperatures. These materials did not have good activities for the water gas shift reaction under …
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The Chemistry of Methanol On Gold and Gold Based Bimetallic Clusters On TiO2 (110) Single Crystal
<p>The activity of methanol oxidation over gold clusters deposited by physical vapor deposition on a TiO2 (110) single crystal was studied by temperature programmed desorption. These studies were performed under ultra high vacuum conditions to elucidate the mechanism of gold catalyzed oxidation …
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Development of Catalytic Processes for the Transformation of Low Value Chemical Feedstocks to Value Added Chemicals
… work for the catalytic conversion of methane to methanol, methane to ethane and higher alkanes, and glycerol to 1,3-propanediol. Chapter 2 describes efforts to study the kinetics of methanol oxidation by aqueous sodium periodate. The presence of methane pressure in these reactions hinders the …
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Synthesis and Characterization of Platinum-Based Fuel Cell Catalysts
… platinum nanoparticles. Their reactivity toward methanol oxidation maximized at ruthenium packing density 0.4--0.5, displaying twice the activity of the commercial Pt-Ru alloy catalyst. COs adsorbed on these Pt/Ru nanoparticle consisted of two domains: CO on Pt domains behaved like CO on pure Pt …
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NICKEL HYDROXIDE NANORIBBONS FOR EFFICIENT WATER SPLITTING AND DIRECT METHANOL FUEL CELL
Oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) are very important reactions in hydrogen harvesting system and direct methanol fuel cell (DMFC). However, these two reactions are sluggish processes, due to the multi-proton coupled reactions. In this work, we report the first …
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Exploration of the Structure and Catalytic Activity of Modified Platinum Substrates
… alternative to emissions-producing devices. Both methanol and formic acid are promising fuels for this type of technology; however, to maintain catalytic efficiency and purity, the platinum anode must be modified by another metal, altering the electronic and catalytic properties of the platinum …
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Electrochemical investigation of platinum nanoparticles supported on carbon nanotubes as cathode electrocatalysts for direct methanol fuel cell
… Pt/LPGMWCNT also showed better tolerance toward methanol, however it was not highly active towards methanol, and hence the methanol oxidation peak current observed between 0.75 and 08 potential was the smallest. In this study a wide range of instruments was used to characterize the properties and …
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The Intrinsic Activation Energy as a Guide to Mechanisms of Reactions on Solid Surface
… position of transition state. TPD experiments of methanol oxidation on (2 x 1)Pt(110) have demonstrated that intrinsic barrier for surface reactions is in fact similar to that of gas phase reactions.
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Anodic alcohol fuel cell reactions at platinum active sites on doped metal oxide supports
… faster kinetics and less poisoning during the methanol and ethanol oxidation reactions compared to the commercial Pt/C. When compared in an acidic ethanol and methanol oxidation, Pt/TOS and Pt/NbOS exhibit smaller activation energies than Pt/C, however, only Pt/NbOS produces smaller charge …
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The development of inorganic and organic/inorganic membranes for DMFC application
… namely the hydrogen fuel cell and the direct methanol fuel cell are preferred amongst other fuel cell types for stationary and vehicular applications, due to their small size and their low operating temperature. The direct methanol fuel cell has several advantages over the hydrogen fuel cell …
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Characterization of Anodic Fuel Cell Catalysts Utilizing Various Surface Sensitive Techniques
… tool for determining the poison from formic acid oxidation on palladium nanoparticles. Further, the efficacy of methyl formate oxidation on the catalyst was examined. This fuel was determined to hold no advantages over formic acid for oxidation with the Pt/Pd catalyst. This study also revealed the …
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Synthesis and characterization of Pt/TiO2/C composite catalysts for fuel cells prepared using a glucose modifier
… toward oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR) as well as improved stability of the Pt-TiO2 heterogeneous interface formed between catalyst and support. The enhanced performance and durability of these composite catalysts is improved by applying the science of …
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Trends in C-H bond dehydrogenation energetics for small molecule conversion
… of small molecules such as formaldehyde, methanol, methane, and propane with oxide surfaces to reveal trends in adsorption energies, product selectivity, and reaction rates. We achieve this by developing suitable design descriptors by studying the reaction mechanism in situ. We first …
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