Impact of selective catalytic reduction on exhaust particle formation over excess ammonia events
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Impact of selective catalytic reduction on exhaust particle formation over excess ammonia events. / Amanatidis, Stavros; Ntziachristos, Leonidas; Giechaskiel, Barouch; Bergmann, Alexander; Samaras, Zissis.
In: Environmental Science and Technology, Vol. 48, No. 19, 07.10.2014, p. 11527-11534.Research output: Contribution to journal › Article › Scientific › peer-review
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TY - JOUR
T1 - Impact of selective catalytic reduction on exhaust particle formation over excess ammonia events
AU - Amanatidis, Stavros
AU - Ntziachristos, Leonidas
AU - Giechaskiel, Barouch
AU - Bergmann, Alexander
AU - Samaras, Zissis
PY - 2014/10/7
Y1 - 2014/10/7
N2 - The introduction of selective catalytic reduction (SCR) aftertreatment to meet stringent diesel NOx emission standards around the world increases exhaust ammonia. Further to the direct air quality and health implications of ammonia, this may also lead to particle formation in the exhaust. In this study, an ammonia SCR system was examined with respect to its impact on both solid and total exhaust particle number and size distribution, downstream of a diesel particulate filter (DPF). Fuel post-injection was conducted in some tests to investigate the effect of ammonia during active DPF regeneration. On average, the post-DPF solid >23 nm and total x control. Ammonia did not have a significant additional effect on the high particle concentrations measured during DPF regeneration. Based on species availability and formation conditions, sulfate, nitrate, and chloride salts with ammonium are possible sources of the new particles formed. Ammonia-induced particle formation corresponds to an environmental problem which is not adequately addressed by current regulations.
AB - The introduction of selective catalytic reduction (SCR) aftertreatment to meet stringent diesel NOx emission standards around the world increases exhaust ammonia. Further to the direct air quality and health implications of ammonia, this may also lead to particle formation in the exhaust. In this study, an ammonia SCR system was examined with respect to its impact on both solid and total exhaust particle number and size distribution, downstream of a diesel particulate filter (DPF). Fuel post-injection was conducted in some tests to investigate the effect of ammonia during active DPF regeneration. On average, the post-DPF solid >23 nm and total x control. Ammonia did not have a significant additional effect on the high particle concentrations measured during DPF regeneration. Based on species availability and formation conditions, sulfate, nitrate, and chloride salts with ammonium are possible sources of the new particles formed. Ammonia-induced particle formation corresponds to an environmental problem which is not adequately addressed by current regulations.
UR - http://www.scopus.com/inward/record.url?scp=84907936083&partnerID=8YFLogxK
U2 - 10.1021/es502895v
DO - 10.1021/es502895v
M3 - Article
VL - 48
SP - 11527
EP - 11534
JO - Environmental Science and Technology
JF - Environmental Science and Technology
SN - 0013-936X
IS - 19
ER -