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Showing 1 to 15 of 15 for “"N-containing"”.
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Adding ammonia during Fischer-Tropsch Synthesis: Pathways to the formation of N-containing compounds
… aspects of the pathway to the formation of N-containing compounds that form when NH₃ is added during FTS, using mostly iron based catalysts is investigated. In addition, the effect this has on the FTS reaction itself is evaluated. To achieve this goal, both theoretical and experimental …
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Effect of ammonia co-feeding on oxygenates over K-Mo2C in the Fischer-Tropsch synthesis
… It has been shown that the so-called nitrogen containing compounds are formed instead of the Fischer-Tropsch typical albeit minor products alcohols, aldehydes and carboxylic acids, i.e. oxygenates. Increasing the oxygenate selectivity was investigated in numerous studies as no commercial FT …
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Synthesis, Structure and Properties of New Iodine Derivatives of Natural Aromatic Acids // Синтез, структура и свойства на нови йодопроизводни на природни ароматни киселини
… in view of the apparent deficiency of iodine-containing contrast agents, the synthesis of new organoiodic compounds is extremely valuable and significant. Syntheses have been carried out, and the structural features and biological properties of a series of new organoiodic substances have been …
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Sources And Controls Of Reactive Nitrogen Gas Emissions From A Mojave Desert Ecosystem
… radiation result in thermal decomposition of N-containing compounds, yielding elevated rates of reactive N gas efflux. Chapter three focuses on the effects of elevated CO2 on soil fluxes of reactive N gases. Under soil conditions optimal for biological activity, long-term fumigation with …
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Asymmetric Catalysis with Brønsted Acids: Experiments and Calculations
The research described herein focuses on enantioselective catalysis using BINOL-based Brønsted acids. The initial part of this work comprises the development of chiral phosphoric acids and N-triflylphosphoramides having alternative groups at the 3,3’- positions, different from the widely common …
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Mechanistic Investigation of FCC CO/NOx Emission Control Additives
… accelerate the oxidation of CO. For example, Pt-containing combustion promoters are commonly used as additives to the circulating catalyst inventory in FCC units for this purpose. However, in the presence of these promoters N-containing coke species are also converted to NOx. As a result, these …
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Toxic Gas Sensing on Nanoporous Carbons
… of NH<sub>4</sub><sup>+</sup>. Among all N-containing groups, nitrogen located in six-membered rings (pyridines and quaternary nitrogen), rather than nitrogen on the periphery (amines, amides) played the most important role in sensing. An important aspect was the conversion of the conduction …
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Pitman estimation for ensembles and mixtures
… are indexed through elements of 𝓦(n) containing n-dimensional vectors 𝐰 such that Σ<sub>i=1</sub><sup>n</sup>w<sub>i</sub> = 1, where 𝐰'Σ = c𝟏<sub>n</sub>’ for some scalar c>0. Of interest is the class Ω(n) = Λ(n⁻¹𝟏<sub>n</sub>), containing equicorrelation matrices in the intersection …
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Hybride von Metall-Nanopartikeln mit hochverzweigten Polyethylenimin als lösliche, abtrennbare Katalysatoren
… of similar size. Coordination of the N-containing functional groups may block surface sites. Rhodium dispersions stabilized by PEI-amide were studied as catalysts for hydroformylation of 1-hexene. By comparison to rhodium(I) complexes as catalyst precursors (in the presence of polymer), …
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Homo- and heterodinuclear luminescent helicates
… to prepare mono- and dinuclear lanthanide(III)-containing systems using 8-hydroxyquinoline and its derivatives as building blocks. First, effective pathways for the synthesis of ligands possessing appropriate (bi-, tri-, tetradentate) chelating units were elaborated. Thus, 8-hydroxyquinolines …
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Catalysts and electrodes for the electroreduction of carbon dioxide to useful chemicals
… overpotential (only < 0.7 V). The effect of N-containing compounds on the products distribution for the electroreduction of CO2 on Cu catalysts is discussed in Chapter 5. Specifically, 3,5-diamino-1,2,4-triazole (DAT) improves the Faradaic efficiency of C2H4 by more than 1.5 fold when used in …
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GaAs-based quantum well and quantum dot light-emitting diodes and lasers for 1.3 and 1.55 um emission
… dependent on the current injection location in N-containing diodes, due to a poor carrier spreading along the length of the laser diodes, which is alleviated if the current is injected at several points separated by a certain distance. A model is proposed as an explanation for this phenomenon, in …
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Evaluation of management practices and remediation techniques for improving water quality in agricultural systems
Surface water quality impairment is often associated with agricultural activities. In this study, the effects of three sugarcane residue management techniques, namely burning (BR), shredding (SR), and retention (RR) of residues on: surface water quality, carbon export, and chemical composition of …