Publikations Einzelansicht

Titel: Kinetics of nitric oxide reduction with pure and potassium-doped carbon
 

Autor(en):
 
A. von Richthofen, E. Wendel und D. Neuschütz
 
Journal: Fresenius J Anal Chem
Jahr: 1993
Band: 346
Seite(n): 261-264


Zusammenfassung:
The kinetics of the reduction of nitric oxide with pure and potassium-doped carbon, NO + C = ½ N2 + CO, were investigated. For the reaction of NO with pure carbon, measurements were made in the temperature range from 1750 K to 2130 K and at initial NO pressures between5 X 10-3 Pa and7 X 10-2Pa. The reaction was first order with respect to nitric oxide at NO pressures beiow3 X 10-2Pa. The activation energy was 54 kJ/mol for temperatures below 2000 K, while at higher temperatures a second (parallel) reaction became noticeable with a definitely higher activation energy. Potassium-doped carbon was prepared by a molecular beam technique. AES studies verified that potassium was intercalated into the graphite surface and that the potassium-to-carbon ratio changed continuously with sample temperature. The reduction of NO with K-doped carbon was investigated in the temperature range from 710 K to 1080 K and at initial NO pressures between7 X 10-5 Pa and6 X 10-4 Pa while monitoring, in-situ using AES the K/C-ratio of the surface. The NO reduction rate rose linearly with K/C. Compared to pure carbon, the reaction rate for the NO reduction with K-doped carbon increased by a factor in the range of 104. The activation energy for the NO reduction with K-doped carbon was found to be 82 kJ/mol.

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Publikations Einzelansicht

Titel: Kinetics of nitric oxide reduction with pure and potassium-doped carbon
 

Autor(en):
 
A. von Richthofen, E. Wendel und D. Neuschütz
 
Journal: Fresenius J Anal Chem
Jahr: 1993
Band: 346
Seite(n): 261-264


Zusammenfassung:
The kinetics of the reduction of nitric oxide with pure and potassium-doped carbon, NO + C = ½ N2 + CO, were investigated. For the reaction of NO with pure carbon, measurements were made in the temperature range from 1750 K to 2130 K and at initial NO pressures between5 X 10-3 Pa and7 X 10-2Pa. The reaction was first order with respect to nitric oxide at NO pressures beiow3 X 10-2Pa. The activation energy was 54 kJ/mol for temperatures below 2000 K, while at higher temperatures a second (parallel) reaction became noticeable with a definitely higher activation energy. Potassium-doped carbon was prepared by a molecular beam technique. AES studies verified that potassium was intercalated into the graphite surface and that the potassium-to-carbon ratio changed continuously with sample temperature. The reduction of NO with K-doped carbon was investigated in the temperature range from 710 K to 1080 K and at initial NO pressures between7 X 10-5 Pa and6 X 10-4 Pa while monitoring, in-situ using AES the K/C-ratio of the surface. The NO reduction rate rose linearly with K/C. Compared to pure carbon, the reaction rate for the NO reduction with K-doped carbon increased by a factor in the range of 104. The activation energy for the NO reduction with K-doped carbon was found to be 82 kJ/mol.

Zurück zur Listen Ansicht