Articles online

Homogeneous Ternary H2SO4–NH3–H2O Nucleation and Diesel Exhaust: a Classical Approach

Category: Articles

Volume: 7 | Issue: 4 | Pages: 489-499
DOI: 10.4209/aaqr.2007.02.0008
PDF | RIS | BibTeX

Mikko Lemmetty1, Hanna Vehkamäki2, Annele Virtanen1, Markku Kulmala2, Jorma Keskinen 1

  • 1 Aerosol Physics Laboratory, Institute of Physics, Tampere University of Technology, P.O. Box 692, FIN-33101 Tampere, Finland
  • 2 Division of Atmospheric Sciences, Department of Physical Sciences, University of Helsinki. P.O., Box 64, FIN-00014 University of Helsinki, Finland


The classical nucleation theory was used to model ternary nucleation at temperatures and concentrations observed in diluting diesel exhaust. The nucleation rate does not markedly depend on the NH3 concentration below the level of 0.8 ppb, with the binary H2O–H2SO4 mechanism dominating. This rules out the effect of dilution air ammonia levels on nucleation mode formation in most cases. On the other hand, with high NH3 concentration in the case of SCR (Selective Catalytic Reduction) technology, we predict a dependence between the ammonia slip and the nucleation mode concentration.


Ternary nucleation Diesel exhaust Ammonia slip Aerosol emissions

Related Article

Microstructure and Chemical Composition of Diesel and Biodiesel Particle Exhaust

Olga B. Popovicheva , Elena D. Kireeva, Sandro Steiner, Barbara Rothen-Rutishauser, Natalia M. Persiantseva, Mikhail A. Timofeev, Nataljia K. Shonija, Pierre Comte, Jan Czerwinski
Volume: 14 | Issue: 5 | Pages: 1392-1401
DOI: 10.4209/aaqr.2013.11.0336

Non-Collecting Electrical Sensor for Particle Concentration Measurement

Antti Rostedt , Marko Marjamäki, Jaakko Yli-Ojanperä, Jorma Keskinen, Kauko Janka, Ville Niemelä, Ari Ukkonen
Volume: 9 | Issue: 4 | Pages: 470-477
DOI: 10.4209/aaqr.2009.03.0023

Critical Emissions from the Largest On-Road Transport Network in South Asia

Saroj Kumar Sahu , Gufran Beig, Neha Parkhi
Volume: 14 | Issue: 1 | Pages: 135-144
DOI: 10.4209/aaqr.2013.04.0137

Ambient Air Quality during Diwali Festival over Kolkata – A Mega-City in India

A. Chatterjee , C. Sarkar, A. Adak, U. Mukherjee, S.K. Ghosh, S. Raha
Volume: 13 | Issue: 3 | Pages: 1133-1144
DOI: 10.4209/aaqr.2012.03.0062