Hydrogen/oxygen consumed

Two major pathways exist for this reaction, one bypassing hydrogen peroxide (first pathway) and the other involving intermediate peroxide formation via reaction (15.21) (second pathway). The peroxide formed is either electrochemically reduced to water via reaction (15.22) or decomposed catalytically on the electrode surface via reaction (15.23), in which case half of the oxygen consumed to form it reemerges [in both cases the overall reaction corresponds to Eq. (15.20)]. 

After TPD of hydrogen, the sample was reoxidized at the activation temperature by injecting pulses of pure oxygen in helium referenced to helium gas. After oxidation of the cobalt metal clusters, the number of moles of oxygen consumed... 

In contrast, the scope of improvements may be easily widened with the incorporation of oxygen-consuming gas-diffusion electrodes (GDE) in the construction of electrolysers as a substitute for the conventional hydrogen-evolving cathodes. 

The substitution of conventional hydrogen-evolving cathodes with oxygen-consuming gas-diffusion electrodes (GDE), often referred to as oxygen-depolarised cathodes (ODC), also allows a substantial reduction in the energy consumption of the chlor-alkali process. 

The resulting electrochemical reaction produces a flow of electrons to provide the electrical power along with water and heat. The power is used by the orbiter s electrical system. The oxygen and hydrogen are consumed in the reaction in proportion to the orbiter s electrical power demand. 

Quantitation of glucose using glucose oxidase is achieved by measurement of either the hydrogen peroxide formed or the oxygen consumed during the reaction, both of which are proportional to the 3-D-glucose content of the sample. 

A fascinating option is offered by carbon-based oxygen-consuming cathodes, which can reduce oxygen into hydrogen peroxide (e.g. [50]). Thus, an oxidizing agent is produced at the cathode In combination... 

If a detailed potential is not required in the model, then the catalyst layer can be treated as simply the location where oxygen and hydrogen are consumed and water is produced. Hence, Faraday s law (eq 24) is used as a generation/consumption term in the... 

In this reduced scheme, step I is the fuel-consumption step, which is seen also to consume radicals. Step II is the step for production of C2 species not in steady state, important for obtaining correct CH profiles. Step III is the water-gas shift that burns CO. The oxygen is consumed by step IV, which is the source of radical production through the hydrogen-oxygen branched chain. 

The statement of Boyle that only a very small proportion of the bulk of the air is consumed, is easily explained by the fact that he has used alcohol or other organic combustibles, so that the volume of oxygen consumed has been replaced largely by the carbon dioxide and monoxide produced, and that only that variable volume has disappeared produced by the oxidation of the hydrogen of the combustible. It will be noted that Boyle, in using the term volatile nitre, recognizes like Hooke and Willis the similarity of the action of saltpeter to the unknown substance in the air. 

OXYGEN CONSUMED (OC COD DOC). A measure of the quantity of oxidizable components present in water. Since the carbon and hydrogen,... 

However, the removal of carbon monoxide by water-gas shift to a low level still demands its selective oxidation to the minimum concentration possible. Much research and development has been conducted during the past decades to find a gold catalyst that can do this the target is usually described by the acronym PROX (preferential oxidation), but sometimes as SCO (selective catalytic oxidation). The task is somewhat simplified by the constraints that are externally imposed the preferred feed gas, often termed idealised reformate, has the composition 1.0% CO, 1.0% 02, 75.0% H2, balance nitrogen or other inert gas, and while of course variations to this composition can be made to explore the kinetics and mechanism, and the effects of the products water and carbon dioxide can be added to observe their effects, the successful catalyst must remove almost all the carbon monoxide (to <10 ppm) and less than 0.5% hydrogen. This requirement is expressed as a selectivity based on the percentage of the oxygen consumed that is taken by the carbon monoxide this should exceed 50%, under conditions where the conversion of carbon monoxide is above 99.5%.5... 

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