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.
Results
Showing 1 to 20 of 30 for “"reaction order"”.
-
Kinetic studies of ethane dehydrogenation using carbon dioxide as mild oxidant over gallium aluminum mixed oxide
… to be sensitive to the surface composition. The reaction order on ethane is close to 1 for gamma- Al2O3 and surface Ga/Al ratios lower than 0.1, while it is close to 0.7 for ratio above 0.1 and pure Ga2O3. We also evaluated the effects of utilizing CO2 as the mild oxidant in ethane …
-
HIGH TEMPERATURE KINETICS OF PRECIPITATION AND DISSOLUTION OF FERROUS-CARBONATE
Ferrous carbonate has been studied in batch reactions under rigorously anoxic conditions to determine thermodynamic and kinetic information about the compound. This information is particularly of interest in corrosion control and in the comparison of FeCO$\sb3$ to CaCO$\sb3$, a compound which has …
-
Supercritical water gasification of waste residues
… the efficiencies, and to model the gasification reaction. The gas product was analyzed by gas chromatography and a 22 full factorial was performed to identify the effects of the process variables on each component of the gaseous product. The three process variables explored in this investigation …
-
Synthesis, properties, and morphology of lignin based epoxy resins
… value was 1100MPa (57% lignin). The curing reaction was of nth-order type, whereby the reaction order changed from close to one at the beginning of the curing reaction to 2, once the reaction becomes diffusion controlled. Curing induced partial demixing of the lignin and poly(propylene …
-
Mechanisms and catalyst design for heterogeneous Olefin metathesis
… of understanding of heterogeneous metathesis reaction mechanisms and the catalysts involved. Current understanding proposes that olefin metathesis follows the Chauvin mechanism in which olefins coordinate with catalytic metal carbenes to form metallacyclobutanes that then rearrange into …
-
The determination of drug stability by HPLC assay of degradation products.
… shorter times, by utilising smaller extents of reaction than use of intact drug analysis. The simulation is applied to single, parallel, consecutive and reversible reactions. The findings of the simulated decompositions are supported by practical decomposition studies on several drugs. HPLC with …
-
Customising lactacystins: studies towards the total synthesis of lactacystin and its analogues
… unsuccessful. The second route inverted the reaction order; performing the decarboxylation at C7 first followed by attempts to reduce the ketone at C6. The reduction was unsuccessful and so a thiomethyl derivative was employed to allow the ketone to be successfully reduced followed by removal …
-
Synthesis, characterization and kinetic investigations of heterophase materials prepared using group transfer polymerization
… investigations involved the determination of the reaction order with respect to initiator and catalyst concentrations. Also, the global energy of activation, under controlled reaction conditions, was elucidated. To extend the synthetic utility of GTP, novel block and graft copolymers were …
-
Chemical vapor deposition of thin films for ULSI interconnect metallization
… copper for film thickness greater than 100 nm. Reaction order experiments show first-order kinetics with respect to Cu(hfac)2 partial pressure and zero-order with respect to isopropanol. A series reaction mechanism including three kinetically significant steps (adsorption of Cu(hfac)2, …
-
FROM TILINGS AND MASTER EQUATIONS TO MICROKINETIC MODELS
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
-
Coupled cycling of metals with nitrogen and carbon in marine sediments
… the primary tools to interrogates these complex reactions. First, I report abiotic oxidation of nitrite to nitrate by manganese(III)-pyrophosphate. This reaction can occur even in the absence of oxygen, unlike biological nitrite oxidation. Reaction rates were measured at a range of …
-
The catalytic reduction of nitric oxide over copper doped aluminosilicates
… nitric oxide over Cu-ZSM-5 was investigated in order to validate the experimental rig and procedures by duplicating published results. An activation energy of 29 kcal/mol was determined and a reaction order with respect to nitric oxide of 1.2 was obtained at 500⁰ C. Both values compare well with …
-
Coupled cycling of metals with nitrogen and carbon in marine sediments
… the primary tools to interrogates these complex reactions. First, I report abiotic oxidation of nitrite to nitrate by manganese(III)-pyrophosphate. This reaction can occur even in the absence of oxygen, unlike biological nitrite oxidation. Reaction rates were measured at a range of …
-
The Role of Surface Coverage of Reaction Intermediates in Heterogeneous Electrocatalysis
The population of reaction intermediates is intimately related to the kinetic landscape and the overall rate of any multi-step reaction. For efficient interconversion of chemical and electrical energy, it is critical to understand the role of catalyst surface coverage and how it relates to two …
-
Design and testing of an integrated catalytic membrane reactor for deoxygenating water using hydrogen for down-hole injection and process applications.
… attractive method for water deoxygenation is the reaction of hydrogen and dissolved oxygen over a wider highly catalytic dispersed surface area, and this can be seen to be achievable by employing membrane technology. Membrane technologies provide compactness and are already applicable in other …
-
Synthesis, kinetics and supercritical fluid fractionation studies of functional organosiloxanes and their incorporation into segmented copolymers
… siloxanolate catalysts. The reactions of the quaternary ammonium and phosphonium systems were limited to about 80°C due to the known transient nature of those species at elevated temperatures. The rates of disappearance of the cyclic tetramer D₄ and aminopropyl disiloxane were …
-
Study of Synthesis, Reactions and Enantiomerization of C<sub>α</sub>-Chiral Grignard Reagents
… in three different modules of this project. Reactions of 1-magnesio-2,2-diphenyl-cyclopropylcarbonitrile with carbon electrophiles are first attempted in order to expand the utility of this configurationally stable C<sub>α</sub>-chiral Grignard reagent in asymmetric synthesis. This reagent …
-
Electrochemical Synthesis of Silver Nanoparticles for Applications in Nitrate Detection, Catalysis and Antibacterial Activity
… reduced after a 60 min period with a first order rate constant of 7.4 x 10-4 s-1. The activity of the hydrogel composite was maintained on dehydrating and rehydrating and following repeated reactions. The hydrogel composite showed antibacterial activity for Staphyloccoccus aureus, MRSA, …
-
Investigation of high-temperature and high-pressure steam gasification kinetics of a coal-derived char surrogate
… of the feedstock followed by the gasification reactions of the remaining carbon (char). As the gasification reactions are significantly slower than combustion reactions or the devolatilization step, these reactions are rate limiting. While most modern commercial petrochemical processes are …
-
Direct oxidative Ammonia-Ammonium salt leaching of sphalerite concentrate from the Gamsberg Mine and study of the catalytic effect of Cu(II) on Zinc extraction
… process was controlled by a surface chemical reaction and was highly sensitive to temperature. The shrinking core models were plotted under optimal conditions, confirming that the leaching process was governed by surface chemical reaction control. The reaction order for total ammonia …
Page 1 of 2