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Showing 1 to 20 of 63 for “"Catalytic reaction"”.
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Catalytic reaction in the process of carbon monoxide disintegration
The catalytic effects of selected iron phases (metal, oxides, sulfides, and carbides) on the Boudouard reaction (2 CO = CO₂ + C) were studied, in an effort to more fully understand the disintegration of refractories when exposed to CO for long periods of time. Based on computer generated …
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Birefringent single-arm fiber optic enthalpimeter for catalytic reaction monitoring
… are almost universally associated with chemical reactions. Thermometry as an analytical tool has been extensively researched and developed. Finding solutions to problems involving thermal isolation, specificity, sensitivity, and cross-sensitivity remain as active areas of interest. Fiberoptic …
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Modeling of non-uniform hydrodynamics and catalytic reaction in a solids-laden riser
… yields high heat and mass transfer rates, and reaction rates. In a Fluid Catalytic Cracking (FCC) process, the performance of riser reactor is strongly dependent on the interaction between the fluid and catalysts, since the reaction takes place on the active surface of the catalysts. This is …
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Dark matter dynamics in the early universe
… model particles. We refer to this process as a catalytic reaction, since C acts as a catalyst for the destruction of D. We further postulate that there is a matter-antimatter asymmetry in C, so that C+C --> D+[phi] is suppressed. We find that the catalytic reaction produces very different …
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Investigations into alkene hydration and alkene oxidation catalysis
… catalysts under a multitude of different reaction conditions. All attempts at performing this catalytic reaction failed to give any alcohol products. Catalytic screening experiments were conducted using a mixture of racemic-et,ph-P4 and meso-et,ph-P4, 1M and 1R, and various transition …
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Transport mechanisms and modeling of riser reactor
… hydrodynamics is closely interacted with kinetic reactions. Common models for the performance prediction of riser reactors overlook this vital coupling effect, which not only miss the important reaction characteristics in the dense-phase transport regime of riser reactors but also misinterpret the …
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Exploration of catalysis activation emergency as a function of gold nanoparticle surface morphology
… 2,4-dinitrophenyl acetate (DNPA) served as the catalytic reaction being analyzed and the bi-ligand composition used was 16-mercaptohexadecanoic acid to imidazole thiol (MHA to IT). The influence of temperature on catalytic reaction of DNPA with the MHA: IT system was tested for ligand rations of …
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Spectroscopic and catalytic investigations of transition metal complexes intercalated in layered silicates
… smectite clay minerals show that this type of reaction can be made very selective, due to the environment of the interlamellar layer of the clay mineral. The oxidation of 2,6-dimethylphenol leads to a greater selectivity toward the diphenoquinone than the polyphenyleneoxide polymer when the …
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ΜΗ-ΦΑΡΑΝΤΑΙΚΗ ΗΛΕΚΤΡΟΧΗΜΙΚΗ ΤΡΟΠΟΠΟΙΗΣΗ ΤΗΣ ΕΝΕΡΓΟΤΗΤΑΣ ΚΑΤΑΛΥΤΩΝ ΟΞΕΙΔΩΣΗΣ ΤΟΥΑΙΘΥΛΕΝΙΟΥ
IT WAS FOUND THAT CATALYTIC ACTIVITY AND SELECTIVITY OF METAL CATALYSTS USED FOR ETHYLENE OXIDATION CAN BE ALTERED DRAMATICALLY AND IN A REVERSIBLE MANNER. THIS IS ACCOMPLISHED BY ELECTROCHEMICALLY SUPPLYING OXYGEN ANIONS ONTO CATALYTIC SURFACES VIA POLARIZED SOLID ELECTROLYTE CELLS. OXYGEN ANIONS, …
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The effect of a DC voltage on the catalytic combustion of natural gas in air over platinum
The effects of a DC voltage on the catalytic combustion rate of natural gas in air over a platinum wire in various configurations is examined. In most cases a high applied voltage reduces and quenches the catalytic reaction. These effects are dependent on the catalyst surface charge density but not …
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Metal-containing and Metal-free systems for small molecule activation
… In Chapter 3, a possible intermediate from the catalytic cycle was isolated and it partly revealed the mechanism of the catalytic reaction.
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Nickel-catalyzed intermolecular reductive couplings of alkynes and aldehydes ; Enantioselective synthesis of (-)-terpestacin and structural revision of siccanol using catalytic stereoselective fragment couplings and macrocyclizations
… aldehydes were coupled reductively in a single catalytic reaction to yield di- and trisubstituted allylic alcohols with high stereoselectivity and regioselectivity. In most cases, a 1:1 ratio of alkyne to aldehyde was sufficient for efficient coupling. The yield and regioselectivity were …
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Benzophenone Derivatives of Hexitols in tthe Carbohydrate Series
… split off from their acetal unions through catalytic reaction. The aromatic glucosides with their partially concealed hydroxyl groups proved to be valuable and interesting material for synthetic reactions among the sugars. |Zervas proved that benzylidene compounds were more useful. He …
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Development of ambient mass spectrometry methods for investigating iron-catalyzed oxidation reactions
Improvement of catalytic reactions relies on detailed understanding of the reaction mechanism, and this in turn depends on the ability to detect, characterize, and identify reaction intermediates that often have extremely short lifetimes or are highly unstable when removed from the reaction medium. …
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Immobilisation of Bio-molecules on Magnetisable Solid Supports for Applications in Bio-catalysts and Bio-sensors
… produce palmitic acid and p-nitrophenol (model reaction), (ii) transesterification of ethyl butyrate with n-butanol to produce butyl butyrate and (iii) partial and selective hydrolysis of cis-3,5-diacetoxy-1-cyclopentene to produce pharmaceutically important and expensive chiral intermediate …
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Investigation of Ni-Ceria Nanocatalysts: Improved Computational Methods Towards Hydrogen Production in Aquaprocessing of Heavy Oil
… for water splitting and water gas shift reactions due to the ability of ceria to temporarily donate oxygen to the catalytic reaction and accept oxygen after the reaction is completed. Therefore, elucidating how different properties of the nanoparticles, such as structure, size, …
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Mechanistic studies on palladium-catalyzed C-N cross-coupling reaction
… on the palladium catalyzed C-N bond-forming reaction were carried out to generate a more complete understanding of the catalytic cycle. To understand this reaction, several kinetic studies employing simple aryl halide and amine coupling partners were performed to elucidate unknown reaction …
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Non-Steady-State Catalyst Characterization with Thin-Zone TAP Experiments
… economic and environmental relevance of catalytic technologies. To address this challenge, precise kinetic characterization of industrial catalysts is required for elucidating complex reaction mechanisms, establishing structure-activity relationships, and building scientifically-sound …
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Pyridine Modified Gold Nanoparticles for Electrocatalytic Carbon Dioxide Reduction and Methanol Oxidation Reactions
… 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 gold electrode is CO due to its low …
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