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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 40 for “"Heterogeneous reactions"”.
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The Stability of Heterogeneous Reactions
Made available in DSpace on 2014-12-08T23:18:19Z (GMT). No. of bitstreams: 1 6711938.pdf: 5197310 bytes, checksum: 364184288170940c88b67fb62a6f2556 (MD5) Previous issue date: 1967
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Heterogeneous reactions on sulfuric acid films with implications for ozone depletion
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1996.
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Heterogeneous Reactions of Nitric Acid and Dinitrogen Pentoxide on Mineral Dust Surfaces: A Knudsen Reactor Study
The heterogeneous reactions of nitric acid and dinitrogen pentoxide with various authentic dust, mineral and clay mineral surfaces has been investigated my means of the Knudsen reactor techique at room temperature. Authentic dust surfaces from the Saharan, the Chinese and the Arizona dust regions …
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Density Functional Theory modeling of heterogeneous reactions of hydrocarbon intermediates on silicon carbide: surrogate kinetic model development for Chemical Vapor Infiltration
… to be understood completely. Modeling surface reactions of decomposition on the substrate using Density Functional Theory is the key point of current research. By focusing on the adsorption, reaction, and desorption mechanisms that control SiC development, our method incorporates quantum …
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Reactive uptake of O₃ and N₂O₅ on organic mixtures and inorganic solutions coated with organic monolayers
… visibility, air pollution, and human health. Reactions between gas-phase molecules and particles (heterogeneous reactions) affect not only the particle composition and morphology, but also the composition of the atmosphere. This thesis investigates the heterogeneous chemistry of organic …
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Dynamics of Atmospherically Important Triatomics in Collisions with Model Organic Surfaces
… dynamics and mechanisms of important interfacial reactions. A thorough understanding of the fundamental interactions between a gas and surface is crucial to the study of heterogeneous chemistry of atmospheric organic aerosols. In addition to changing the chemical and physical properties of the …
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Computational design, sensitivity analysis and optimization of fuel reforming catalytic reactor
… by detailed reaction mechanisms including 38 heterogeneous reactions with 20 surface-adsorbed species for the Rh catalyst and 24 heterogeneous reactions with 11 surface-adsorbed species for Pt catalyst. The numerical results are compared with experimental data and good agreement is observed. …
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Diffusion in pulsating flow in a conduit
… interest is in the study of diffusion controlled heterogeneous reactions in tubular reactors. The majority of the heterogeneous reactions and especially those of industrial importance are diffusion controlled. If pulsations bring about a change in the rate of diffusion as has been postulated, then …
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Development of a Simulation Model for Fluidized Bed Mild Gasifier
… transport equations are solved with three heterogeneous (gas-solid), two homogeneous (gas-gas) global gasification reactions. Development of the model starts from simulating single-phase turbulent flow and heat transfer to understand the thermal-flow behavior followed by five global …
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Exploring the heterogeneous uptake of gas-phase PFCAs to the condensed phase
… phase chemical from air to water begins with the heterogeneous uptake of the gas-phase molecule onto the liquid’s surface. Heterogeneous reactions are important in identifying sinks and the fate of atmospheric gas-phase chemicals. Currently there exists no experimental gas-phase uptake data for …
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Development of a Knudsen Cell Reactor for Measuring the Uptake of Atmospheric Gases on Particulate Matter
Heterogeneous reactions between mineral dust aerosols and gas phase volatile organic compounds have the potential to impact important atmospheric chemical processes. However, little is known about the uptake and reactivity of volatile organic compounds on particulates found in the environment. A …
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A Study of Hg Adsorption and Reactions in a Flue Gas
<p>Heterogeneous reactions of elemental Hg adsorption and oxidation in a simulated flue gas system were studied. Density functional theory using B3LYP paramerization were used to calculate binding energies, thermodynamic parameters, and kinetic constants. Binding energy calculations show that HCl, …
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Multifunctional reactive nanocomposite materials
… Clear differences in the low-temperature redox reactions, well- detectable by differential scanning calorimetry (DSC), were established between MIC and ARM-prepared materials. However, the materials behaved similarly to each other in the ignition experiments. It is proposed that the ignition of …
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Evaluation of alkali and alkaline earth doped samarium oxide catalysts for the oxidative coupling of methane
… and carbon dioxide. Although the homogeneous reactions are well understood, the heterogeneous reactions and their effect on the homogeneous reactions are still the subject of much research and discussion. The effect of the catalyst characteristics on the heterogeneous reactions is also an …
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A theoretical and empirical exploration into the heterogeneous fragility of Chilean firms and workplaces
This dissertation consists of three essays on the heterogeneous reactions of firms to shocks, with particular empirical applications to the Chilean economy. The first essay presents a model of heterogeneity in an economy with financial constraints. The main issue in the model is to characterize the …
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The Study of the Sulphation of [alpha]-olefins
… the reactants are immiscible initially, the heterogeneous reactions become homogeneous in a very short time (less than a second). So that the reaction kinetics can be analysed by a homogeneous model, and the best conditions to achieve the highest yield were found experimentally.
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Theoretical and experimental studies of heterogeneous chemical processes leading to stratospheric ozone depletion
The microscopic chemical mechanisms of heterogeneous reactions involving HC on crystalline ice and nitric acid trihydrate (NAT) are of fundamental interest to physical chemists, because such reactions yield "active" chlorine compounds that are readily photolyzed to yield radicals responsible for …
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Total Surface Area in Indoor Environments
… air, such as deposition, partitioning, and heterogeneous reactions, involve interactions with surfaces. To accurately describe the surface-area-to-volume ratio in a room, we have characterized the surface area, volume, shape, and material of objects in five bedrooms, four kitchens, and three …
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Fundamental Studies of Two Important Atmospheric Oxidants, Ozone and Hydroxyl Radical, Reacting with Model Organic Surfaces
Heterogeneous reactions between gas-phase oxidants and particulate-phase organic compounds impact many important atmospheric chemical processes. For example, little is known about the reaction dynamics of gaseous oxidants with organic compounds found in the atmosphere. The first step of the …
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Development of Microcombustors and Characterization of Confined Sub-Millimeter Laminar Diffusion Flames
… an estimated 400W-cm-3 was built by reducing heterogeneous reactions in the combustor, tailoring the flow pattern of the fuel and oxidizer, and properly insulating the combustor to limit heat loss. A four-step surface treatment scheme was developed to mitigate radical quenching on …
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