Sep
09

Investigacion sobre la Oxidacion del Metano

Filed Under (cruise blog) by Ting on 09-09-2009

Tawnya Peterson esta llevando acabo experimentos con la oxidación del metano. ¿Qué sucede con el metano formado en las aguas? ¿Se va a la atmósfera o al fondo del océano después de ser oxidado?

Tawnya Peterson is doing experiments on methane oxidation. What happens to methane formed in the water? Is it going to the atmosphere or to the bottom of the ocean after being oxidized?

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Tawnya Peterson esta tomando muestras para los experimentos de la oxidacion del metano.
Tawnya Peterson is taking water samples for methane oxidation experiments.
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Tanwnya esta trabajando en las muestras de agua.
Tawnya is working on the water samples.
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Fred Prahl esta tomando muestras para medir la oxidacion del metano.
Fred Prahl is taking water samples to measure methane oxidation.
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Josh Manger esta cambiando el CTD rosette de 24 cilindros Niskin de 10L a un CTD Sea-bird 911Plus con sensor 401K-105.
Josh Manger is changing the CTD rosette of 24 cylinders of 10-L Niskin bottles, Sea-bird 911plus with pressure sensor 401K-105.
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CTD Seabird 911plus con sensor 401K-105
CTD Seabird 911plus with pressure sensor 401K-105
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Caroline Fortunato esta tomando muestras de agua con el CTD Sea bird.
Caroline Fortunato is taking water samples using the CTD Sea bird.
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Las muestras de agua recogidas de la parte inferior y la superficie del río.
Water samples are collected from the bottom and the surface of the river.

La muestra cristalina es del fondo; la muestra turbulenta es de la superficie.
The clear one is from the bottom water and the muddy one is from the surface water.

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Additional information from Wikipedia

Oxidación del Metano

¿Qué es una oxidación? La oxidación es una reacción química donde un compuesto cede electrones, y por lo tanto aumenta su estado de oxidación.

Se debe tener en cuenta que en realidad una oxidación o una reducción es un proceso por el cual cambia el estado de oxidación de un compuesto.

¿Qué es la oxidación del metano? Es la combustión del metano en presencia de oxigeno. El metano se oxida rápidamente a dióxido de carbono (CO2) en presencia de la radiación ultravioleta. La oxidación del metano por las bacterias es otro proceso importante de la transformación del metano en el ambiente.

Reacción del Metano

En la reacción de combustión de metano (CH4), éste se combina con oxígeno molecular (O2) del aire para formar dióxido de carbono (CO2) y agua. (H2O).

CH4 + 2O2 → CO2 + 2H2O

Ésta ecuación dice que 1 molécula de metano reacciona con 2 moléculas de oxígeno para dar 1 molécula de dióxido de carbono y 2 moléculas de agua.

Más información: http://es.wikipedia.org/wiki/Metano

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Oxidation of Methane

What is oxidation? Oxidation describes the loss of electrons or the increase in oxidation state by a molecule, atom or ion.

What is methane oxidation? It is the addition of oxygen to the methane molecule to generate carbon dioxide. This can occur through various ways. One way is through combustion in the presence of oxygen. Methane is also rapidly oxidized to carbon dioxide (CO2) in the presence of ultraviolet radiation. Oxidation of methane by bacteria is another important way methane is transformed in the environment.

Reactions of methane

Main reactions with methane are: combustion, steam reforming to syngas, and halogenations. In general, methane reactions are hard to control. Partial oxidation to methanol, for example, is difficult to achieve; the reaction typically progresses all the way to carbon dioxide and water.

In the combustion of methane, several steps are involved:
Methane is believed to form formaldehyde (HCHO or H2CO). The formaldehyde gives a formyl radical (HCO), which then forms carbon monoxide (CO). The process is called oxidative pyrolysis:

CH4 + O2 → CO + H2 + H2O

Following oxidative pyrolysis, the H2 oxidizes, forming H2O, replenishing the active species and releasing heat. This occurs very quickly, usually in significantly less than a millisecond.

2H2 + O2 →2H2O

Finally, the CO oxidizes, forming CO2 and releasing more heat. This process is generally slower than the other chemical steps, and typically requires a few to several milliseconds to occur.

2CO + O2 →2CO2

The result of the above is the following total equation:

CH4(g) + 2O2 (g) → CO2 (g) + 2H2O(l) + 890 kJ/mol

where bracketed “g” stands for gaseous form and bracketed “l” stands for liquid form. This reaction releases a lot of energy which is why methane can be used as a fuel source.

More information: http://en.wikipedia.org/wiki/Methane



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