Kinetics of particle growth-IV: NH4NO3 from the NH3-O3 reaction revisited

Kenneth J. Olszyna*, Rosa G. de Pena, Menachem Luria, Julian Heicklen

*Corresponding author for this work

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12 Scopus citations

Abstract

The reaction of NH3 with O3 in 1 atm of N2 was restudied at 25°C to obtain more extensive information on the growth of particulate NH4NO3. In the vapor phase, NH4NO3 monomer is mainly dissociated into NH3 and HNO3, the HNO3 being continually produced in the reaction and lost by diffusion to the wall with a rate coefficient of ∼ 0·4 min -1. Initially, there is an induction period until the product of [NH3] and [HNO3] reaches 5·8 × 1027 molecules2/cc2. At this point, particle production occurs for a short period of time according to the reaction. rNH3 + rHNO3 → Cr where C represents NH4NO3, r = 8·0 and κ6 = 6·2 × 10-224 cc15/min. Particle production ceases quickly as the HNO3 is removed by the particles already present HNO3 + Cn → Cn .HNO3 followed by NH3 + Cn .HNO3 → Cn+1. Reaction 5a is rate controlling with a rate coefficient of 1·24 × 10-6cc/min when [HNO3] reaches its maximum value. This rate coefficient corresponds to gas kinetic collision frequency for particles of 84 Å dia. Diffusional loss of particles is negligible, but the particle density drops as the run progresses because of coagulation which proceeds with a rate coefficient of 1·3 × 10-7 cc/min. This rate coefficient is within a factor of two of the theoretical collision rate coefficient for a monodisperse system.

Original languageEnglish
Pages (from-to)421-424,IN1-IN2,425-434
JournalJournal of Aerosol Science
Volume5
Issue number5
DOIs
StatePublished - 1974
Externally publishedYes

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