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 20 of 332 for “"Deactivation"”.
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Electrochemical Deactivation of Nitrate, Arsenate, and Trichloroethylene
This research investigated the mechanism, kinetics and feasibility of nitrate, arsenate, and trichloroethylene inactivation on zerovalent iron (ZVI), mixed-valent iron oxides, and boron doped diamond film electrode surfaces, respectively. Nitrate ( ) is a common co-contaminant at sites remediated …
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Deactivation Diagram Development for Naval Ship System Vulnerability Analysis
… limited computational performance or capability. Deactivation diagrams provide an alternative view to conventional system architecture descriptions, allowing for rapid analysis of system connectivity and flow based on precomputed single-state system descriptions. This thesis explores the …
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Studies on the deactivation and reactivation of spent hydroprocessing catalyst
A study is reported on the deactivation of hydroprocessing catalysts and their reactivation by the removal of coke and metal foulants. The literature on hydrotreating catalyst deactivation by coke and metals deposition, the environmental problems associated with spent catalyst disposal, and its …
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Deactivation and enhancement effects of sulfur on supported platinum oxidation catalysts
… of a small amount pore blocking Pt sites. Deactivation of CO and methane oxidation reactions was a result of active site inhibition due to sulfate formation.
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A theoretical view on deactivation of cobalt-based Fischer-Tropsch catalysts
Includes abstract.
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Stereochemical Effect of RAFT Agents on Kinetics of Reversible Deactivation Radical Polymerization
The propagation polymer chains in RDRP can be isolated in the dormant form and be re-activated at chain ends to generate propagating radicals, which initiate subsequent chain extensions. Since the effect of remote substituents on kinetics decreases rapidly with their distance from the reaction site …
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Multi-omic Studies of Neutrophils Reveal Programmed Deactivation Phenotypes After Inflammatory Stimulus
… that this slowing might represent a late deactivation phenotype. This hypothesis was evaluated through a double stimulus experiment, investigating the effect of an initial exposure on neutrophil capacity to process subsequent particulate or soluble stimuli (namely S.aureus, another human …
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A Novel Role for Odorant Binding Proteins in Deactivation of Drosophila Olfactory Neurons
… in the mutants but did reveal a striking deactivation defect to a subset of odorants. Surprisingly, other odorants detected by the same receptor are differentially affected by the absence of OS-E and OS-F, revealing an odorant-specific role for these OBPs in deactivation kinetics. …
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Zeolite deactivation during hydrocarbon reactions: characterisation of coke precursors and acidity, product distribution
… by-products, called coke, which causes catalyst deactivation. This deactivation is due to the poisoning of the acid sites and/or pore blockage. The formation of coke on hydrocarbon processing catalysts is of considerable technological and economic importance and a great deal of work has been …
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The deactivation of Zeolite-Y and mordenite during hexane cracking and propene oligomerisation
… catalyst and reaction would have on the rate of deactivation, properties of coke and transport properties of the catalyst. HY and HM were chosen because of their different pore structures and acid site distributions. Hexane cracking at 1 atmosphere and high pressure propene oligomerisation …
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The effect of activation on the deactivation of a precipitated iron based catalyst
… on the lifetime of the iron-based catalyst (deactivation behaviour) was investigated...
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Development of Deactivation-Resistant Catalysts for Pd-Catalyzed C–N Cross-Coupling Reactions
… heteroarenes that ultimately leads to catalyst deactivation, and (2) the use of a GPhos-supported Pd catalyst, which effectively resists heteroarene-induced catalyst deactivation while promoting efficient coupling, even for challenging and sterically demanding amines. Cross-coupling reactions …
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Understanding the activation-deactivation mechanism of glutamate receptor proteins at the single molecule level
… ion channel. The gating action (activation and deactivation) of the ion channels are controlled by a number of molecules (ligands) interacting with specific binding sites. Hence, these binding sites can serve as potential drug targets for controlling the aberrant activation of the ion channel …
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The kinetics of the deactivation of a nickel catalyst during the hydrogenation of cyclopropane,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1968.
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Deactivation and regeneration of immobilized titanium dioxide photocatalysts during treatment of pharmaceutical micropollutants in groundwater
… an investigation of the long-term stability and deactivation of immobilized TiO2 photocatalysts used to treat PPCPs in groundwater (GW). GW spiked with four model PPCPs (5 µg/L atenolol, sulfamethoxazole, carbamazepine, and 10 µg/L iopromide) was treated with immobilized thin films of TiO2 coated …
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Deactivation and preparation of fused silica open tubular columns for gas and supercritical fluid chromatography
… limitations on the reproducibility of column deactivation and inertness. Hydrothermal treatment of the raw fused silica with nitric acid was proven to be very effective for cleaning and maximizing the degree of silanol coverage of the surface. The capillary rise method was used to obtain …
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