Isolating α-Pinene Ozonolysis Pathways Reveals New Insights into Peroxy Radical Chemistry and Secondary Organic Aerosol Formation

2021 ◽  
Author(s):  
Zixu Zhao ◽  
Wen Zhang ◽  
Taylor Alexander ◽  
Xuan Zhang ◽  
David B. C. Martin ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Peroxy Radical ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Radical Chemistry ◽  
Secondary Organic Aerosol Formation

Secondary Organic Aerosol Formation from Cyclohexene Ozonolysis:  Effect of OH Scavenger and the Role of Radical Chemistry

2004 ◽  
Vol 38 (12) ◽  
pp. 3343-3350 ◽  
Author(s):  
M. D. Keywood ◽  
J. H. Kroll ◽  
V. Varutbangkul ◽  
R. Bahreini ◽  
R. C. Flagan ◽  
...  
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Radical Chemistry ◽  
Secondary Organic Aerosol Formation

scholarly journals Secondary organic aerosol formation from <i>m</i>-xylene, toluene, and benzene

2007 ◽  
Vol 7 (14) ◽  
pp. 3909-3922 ◽  
Author(s):  
N. L. Ng ◽  
J. H. Kroll ◽  
A. W. H. Chan ◽  
P. S. Chhabra ◽  
R. C. Flagan ◽  
...  
Keyword(s):  
Oxidation Rate ◽  
Secondary Organic Aerosol ◽  
Peroxy Radical ◽  
Organic Aerosol ◽  
Rate Effect ◽  
Peroxy Radicals ◽  
Aerosol Formation ◽  
Yield Curves ◽  
Secondary Organic Aerosol Formation ◽  
Seed Aerosol

Abstract. Secondary organic aerosol (SOA) formation from the photooxidation of m-xylene, toluene, and benzene is investigated in the Caltech environmental chambers. Experiments are performed under two limiting NOx conditions; under high-NOx conditions the peroxy radicals (RO2) react only with NO, while under low-NOx conditions they react only with HO2. For all three aromatics studied (m-xylene, toluene, and benzene), the SOA yields (defined as the ratio of the mass of organic aerosol formed to the mass of parent hydrocarbon reacted) under low-NOx conditions substantially exceed those under high-NOx conditions, suggesting the importance of peroxy radical chemistry in SOA formation. Under low-NOx conditions, the SOA yields for m-xylene, toluene, and benzene are constant (36%, 30%, and 37%, respectively), indicating that the SOA formed is effectively nonvolatile under the range of Mo(>10 μg m−3) studied. Under high-NOx conditions, aerosol growth occurs essentially immediately, even when NO concentration is high. The SOA yield curves exhibit behavior similar to that observed by Odum et al. (1996, 1997a, b), although the values are somewhat higher than in the earlier study. The yields measured under high-NOx conditions are higher than previous measurements, suggesting a "rate effect" in SOA formation, in which SOA yields are higher when the oxidation rate is faster. Experiments carried out in the presence of acidic seed aerosol reveal no change of SOA yields from the aromatics as compared with those using neutral seed aerosol.

scholarly journals Secondary organic aerosol formation from <I>m</I>-xylene, toluene, and benzene

2007 ◽  
Vol 7 (2) ◽  
pp. 4085-4126 ◽  
Author(s):  
N. L. Ng ◽  
J. H. Kroll ◽  
A. W. H. Chan ◽  
P. S. Chhabra ◽  
R. C. Flagan ◽  
...  
Keyword(s):  
Oxidation Rate ◽  
Secondary Organic Aerosol ◽  
Peroxy Radical ◽  
Organic Aerosol ◽  
Rate Effect ◽  
Peroxy Radicals ◽  
Aerosol Formation ◽  
Yield Curves ◽  
Secondary Organic Aerosol Formation ◽  
Seed Aerosol

Abstract. Secondary organic aerosol (SOA) formation from the photooxidation of m-xylene, toluene, and benzene is investigated in the Caltech environmental chambers. Experiments are performed under two limiting NOx conditions; under high-NOx conditions the peroxy radicals (RO2) react only with NO, while under low-NOx conditions they react only with HO2. For all three aromatics studied (m-xylene, toluene, and benzene), the SOA yields (defined as the ratio of the mass of organic aerosol formed to the mass of parent hydrocarbon reacted) under low-NOx conditions substantially exceed those under high-NOx conditions, suggesting the importance of peroxy radical chemistry in SOA formation. Under low-NOx conditions, the SOA yields for m-xylene, toluene, and benzene are constant (36%, 30%, and 37%, respectively), indicating that the SOA formed is essentially nonvolatile. Under high-NOx conditions, aerosol growth occurs essentially immediately, even when NO concentration is high. The SOA yield curves exhibit behavior similar to that observed by Odum et al. (1996, 1997a, b), although the values are somewhat higher than in the earlier study. The yields measured under high-NOx conditions are higher than previous measurements, suggesting a "rate effect" in SOA formation, in which SOA yields are higher when the oxidation rate is faster. Experiments carried out in the presence of acidic seed aerosol reveal no change of SOA yields from the aromatics as compared with those using neutral seed aerosol.

Secondary organic aerosol formation from untreated exhaust of gasoline four-stroke motorcycles

Urban Climate ◽  
2021 ◽  
Vol 36 ◽  
pp. 100778
Author(s):  
Sepideh Esmaeilirad ◽  
Ari Setyan ◽  
Jing Wang ◽  
Vahid Hosseini
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Secondary Organic Aerosol Formation

scholarly journals Secondary organic aerosol formation from isoprene photooxidation under high-NOxconditions

2005 ◽  
Vol 32 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jesse H. Kroll ◽  
Nga L. Ng ◽  
Shane M. Murphy ◽  
Richard C. Flagan ◽  
John H. Seinfeld
Keyword(s):  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Aerosol Formation ◽  
Secondary Organic Aerosol Formation
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