Experimental and Theoretical Study on the OH-Induced Degradation of Piperazine under Simulated Atmospheric Conditions

authors

• Tan Wen
• Zhu Liang
• Mikoviny Tomas
• Nielsen Claus
• Wisthaler Armin
• D’anna Barbara
• Antonsen Simen
• Stenstrøm Yngve
• Farren Naomi
• Hamilton Jacqueline
• Boustead Graham
• Brennan Alexander
• Ingham Trevor
• Heard Dwayne

document type

abstract

The OH-initiated photo-oxidation of piperazine was investigated in chamber experiments at the European Photoreactor (EUPHORE) in Spain and by quantum chemistry methods. The rate coefficient for reaction with OH radicals was determined by the relative rate method to be k OH-piperazine = (2.8  0.6)  10-10 cm 3 molecule-1 s-1 at 307 ± 2 K and 1014 ± 2 hPa. The reaction was found to proceed via both C-H and N-H abstraction, the latter resulting in the formation of nitroso-and nitro-piperazine. The reaction in the EUPHORE chamber was accompanied by strong particle formation which was induced by an acid-base reaction between photochemically formed nitric acid and the

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