Partial oxidation

Partial oxidation

In chemistry, a partial oxidation (POX) reaction occurs when a substoichiometric fuel-air mixture is partially combusted in a reformer, creating a hydrogen-rich syngas, which can then be put to further use, for example in a fuel cell.

A distinction is made between "thermal partial oxidation" (TPOX) and "catalytic partial oxidation" (CPOX).

TPOX

TPOX ("thermal partial oxidation") reactions, which are dependent on the air-fuel ratio, proceed at temperatures of 1200°C and above.

CPOX

In CPOX ("catalytic partial oxidation") the use of a catalyst reduces the required temperature to around 800°C - 900°C. The choice of reforming technique depends on the sulfur content of the fuel being used. CPOX can be employed if the sulfur content is below 50 ppm. A higher sulfur content would poison the catalyst, so the TPOX procedure is used for such fuels.

History

1926 Vandeveer en Parr at the University of Illinois used oxygen in the place of air. [ [http://books.google.nl/books?id=cXNmyTTGbRIC&pg=PA230&lpg=PA230&dq=partial+oxidation+history&source=web&ots=v2RLyYw-qP&sig=TJBhHG1_OVXt1Q8tJ_R6NavhbNc&hl=nl&sa=X&oi=book_result&resnum=5&ct=result Industrial Gas Handbook Door Frank G. Kerry. Pag .230] ]

ee also

*IPOX (indirect partial oxidation)
*PROX
*Glossary of fuel cell terms
*Timeline of hydrogen technologies

References

ource

:"Much of this article is translated from the German wikipedia article of 21st March 2007".


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