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Showing 1 to 20 of 72 for “"CO oxidation"”.
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Gold(I) complexes and co oxidation catalysts
… The aggregations are the result of secondary Au--Au interactions. These interactions are also apparent in the structures of the analogous complexes (RNC)AuCl (R = Et or Xy), which were characterised for comparative purposes. (EtNC)AuCl and (BuᵗNC)AuNO₃ formed zig-zag chain structures …
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CO oxidation catalysis with substituted ceria nanoparticles
The low-temperature and cost-effective oxidation of carbon monoxide to carbon dioxide remains a fundamental challenge in heterogeneous catalysis that would enable a diverse range of technologies for electrochemical storage and respiratory health. The development of new catalysts is often driven by …
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CO oxidation on metal supported ultrathin oxide films
… Oxidfilme auf Metallsubstraten wurden in der CO-Oxidation bei niedrigen Temperaturen und quasi-atmosphärischen Drücken untersucht. Eine repräsentative Auswahl ultradünner Filme enthält die Rutheniumoxidfilme gewachsen auf Ru(0001) und Pt(111) und Mangan- und Zinkoxidfilme aufbereitet auf …
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Optimizing Iridium Single Atom and Small Cluster Catalysts for CO Oxidation
… and characterization has only recently become common place. As we now have the ability to synthesis relatively pure systems consisting of single atoms and then to characterize them, there are many interesting questions that we can answer about them. In this work we will use a combination …
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Modeling of single char combustion, including CO oxidation in its boundary layer
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1994.
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Exploring Strategies to Break Adsorption-Energy Scaling Relations in Catalytic CO Oxidation
An atomistic control of chemical bonds formation and cleavage holds the key to making molecular transformations more energy efficient and product selective. However, inherent scaling relations among binding strengths of adsorbates on various catalytic materials often give rise to volcano-shaped …
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Co-oxidation in supercritical water : methylphosphonic acid-ethanol and ammonia-ethanol model systems
… effective solvent for the destruction of organic compounds by oxidation. Because both organics and oxygen have high solubility in water above its critical point (To = 374 °C (647 K), Pc = 221 bar), they can be reacted together in a single phase which avoids mass transfer limitations. At typical …
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Reconstruction of Rhodium Clusters During CO Oxidation and Consequences on The Reaction Mechanism
… role in the chemical industry and the global economy. Most heterogeneous catalysts in the chemical industry and laboratory consist of supported metal nanoparticles, clusters and isolated (single) atoms. Understanding structure sensitivity and identifying the active site or sites are crucially …
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Structure-Sensitivity of CO Oxidation Over Supported Pt Catalysts in the Subnanometer Regime and Its Origin
… many industrially relevant reactions, including CO oxidation for automotive emission control. Being able to activate O2, these catalysts are also promising candidates for oxidative decomposition of chemical warfare agents and their simulants, and CO oxidation serves as a simple model reaction for …
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Anaerobic Carbon Monoxide Dehydrogenase: Mechanism of CO-Oxidation at the [NiFe4S4OHx] Cluster and Nickel-Processing by its ATPase CooC
Anaerobic CO dehydrogenases (CODH) catalyze the reversible oxidation of CO to CO2 at a complex metal center containing Ni, Fe and S called cluster C. In this work, a heterologous expression system of CODHII from Carboxydothermus hydrogenoformans in E. coli and the crystal structures of CODHII in …
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Molecular oxygen adsorbates at a Au/Ni(111) surface alloy and their role in catalytic CO oxidation at 70 - 250 K
… ML Au/Ni(1 111) surface alloys at 77 K, in stark contrast to dissociative adsorption on Ni and no adsorption on Au surfaces. Molecular 02 adsorbates on the Au/Ni(111) surface alloy are identified by their 0=0 vibrational modes at 790, 850 and 950 cm-', measured by electron energy loss …
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Electrocatalysis in Alkaline Media: Mechanistic Studies of Fuel Cell Reactions on Well-Defined Model Catalysts
… to promote both methanol dehydrogenation and CO oxidation on adjacent Pt sites. Ru enhances methanol dehydrogenation through two distinct ligand effects: it increases the intrinsic dehydrogenation activity of adjacent Pt sites, and it causes CO to diffuse away from these active sites, …
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Diversity and activity of aerobic thermophilic carbon monoxide-oxidizing bacteria on Kilauea Volcano, Hawaii
Aerobic carbon monoxide (CO) oxidation is used by phylogenetically and physiologically diverse microorganisms inhabiting a variety of terrestrial and aquatic ecosystems. Activity assays, culture-based studies, and molecular-based approaches targeting the coxL gene, encoding the large subunit of CO …
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Atomic-level Insights Into Atomically Dispersed Metal Catalysts
… and reaction mechanisms under operating conditions. Herein, we report the efforts that we have been put in to gain atomic-level insights into the nature of SACs, and thus to design atomically dispersed metal catalysts with improved catalytic performance. By combining density functional …
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Structural and Kinetic Study of Low-temperature Oxidation Reactions on Noble Metal Single Atoms and Subnanometer Clusters
… showed that catalysts in the subnanometer regime could have extraordinary activity and selectivity. However, the structural performance relationships behind their unique catalytic performances are still unclear. To understand the effect of particle size and shape of noble metals, it is essential …
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Identity and dynamics of the microbial community responsible for carbon monoxide oxidation in marine environments
As colored dissolved organic matter in seawater absorbs UV solar radiation, a variety of simple chemical species are produced, including carbon monoxide (CO). The ocean surface water is saturated with respect to CO, and is thus a source of CO to the atmosphere. CO reacts with and removes …
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Kinetic Consequences of Surface Oxygen Species during Catalytic C3H6-O2, CO-O2, and COx-H2 Reactions on Transition Metal and Alloy Clusters
C3H6 epoxidation, CO oxidation, and COx methanation reactions are important for emission abatement and value-added compound production. They occur on transition metal/alloy clusters via the kinetic coupling of steps that involve activation of carbon containing reactants (C3H6, COx) with …
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Deterministic and stochastic modelling of a catalytic surface reaction
… investigated extensively in experiments is the oxidation of carbon monoxide on platinum.In the present work we first develop a mathematical model for CO oxidation on Pt which is valid over a wide pressure range. This requires the use of different model types. While at low pressures in the gas …
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Dynamics of Carbon-Monoxide Oxidation on Platinum
This work presents a study of kinetics of CO oxidation on a platinum ribbon in a gradientless reactor. An isothermal condition was maintained on the catalyst surface. The reaction rate was measured by a calorimetric technique, and measurements of the effluent CO(,2) concentration were made with an …
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