Role of the aerosol phase state in ammonia/amines exchange reactions

Lap P. Chan, Chak K. Chan

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


The exchange reaction of ammonia in (NH4)2SO 4 with an amine and the corresponding reverse reaction of amines in aminium sulfates with ammonia were investigated using an electrodynamic balance coupled with a Raman spectrometer. The temporal changes in particle mass, chemical composition, and phase state were simultaneously monitored. When the salt particles were in an aqueous state at elevated relative humidities (RHs), the exchange of ammonia/amine vapors in the particle phase was reversible. The exchange rates of aqueous particles were in general higher than those of their corresponding solid counterparts. An aqueous phase was essential for the effective displacement of ammonia and amines. Aminium salts in different phase states and with different evaporation characteristics showed remarkably different reaction behaviors in ammonia vapor. The less compact amorphous aminium sulfate solids were more susceptible to ammonia exchange than the crystalline solids. The aminium salts in a liquid state exhibited substantial amine evaporation at
Original languageEnglish (US)
Pages (from-to)5755-5762
Number of pages8
JournalEnvironmental Science and Technology
Issue number11
StatePublished - Jun 4 2013
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-07-06

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemistry


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