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Unregulated greenhouse gas and ammonia emissions from current technology heavy-duty vehicles


, : Unregulated greenhouse gas and ammonia emissions from current technology heavy-duty vehicles. Journal of the Air & Waste Management Association 66(11): 1045-1060

NlmCategory="UNASSIGNED">The study presents the measurement of carbonyl, BTEX (benzene, toluene, ethyl benzene, and xylene), ammonia, elemental/organic carbon (EC/OC), and greenhouse gas emissions from modern heavy-duty diesel and natural gas vehicles. Vehicles from different vocations that included goods movement, refuse trucks, and transit buses were tested on driving cycles representative of their duty cycle. The natural gas vehicle technologies included the stoichiometric engine platform equipped with a three-way catalyst and a diesel-like dual-fuel high-pressure direct-injection technology equipped with a diesel particulate filter (DPF) and a selective catalytic reduction (SCR). The diesel vehicles were equipped with a DPF and SCR. Results of the study show that the BTEX emissions were below detection limits for both diesel and natural gas vehicles, while carbonyl emissions were observed during cold start and low-temperature operations of the natural gas vehicles. Ammonia emissions of about 1 g/mile were observed from the stoichiometric natural gas vehicles equipped with TWC over all the driving cycles. The tailpipe GWP of the stoichiometric natural gas goods movement application was 7% lower than DPF and SCR equipped diesel. In the case of a refuse truck application the stoichiometric natural gas engine exhibited 22% lower GWP than a diesel vehicle. Tailpipe methane emissions contribute to less than 6% of the total GHG emissions. Modern heavy-duty diesel and natural gas engines are equipped with multiple after-treatment systems and complex control strategies aimed at meeting both the performance standards for the end user and meeting stringent U.S. Environmental Protection Agency (EPA) emissions regulation. Compared to older technology diesel and natural gas engines, modern engines and after-treatment technology have reduced unregulated emissions to levels close to detection limits. However, brief periods of inefficiencies related to low exhaust thermal energy have been shown to increase both carbonyl and nitrous oxide emissions.

US$19.90

PMID: 26950051

DOI: 10.1080/10962247.2016.1158751


Other references

Inada, K.; Baba, H.; Okamura, R., 1983: Studies of human tear proteins--investigation of tear sampling methods. Nippon Ganka Gakkai Zasshi 87(7): 482-489

Reisenauer, H.Peter.; Wagner, J.Philipp.; Schreiner, P.R., 2014: Gas-phase preparation of carbonic acid and its monomethyl ester. Carbonic acid (H2CO3), an essential molecule of life (e.g., as bicarbonate buffer), has been well characterized in solution and in the solid state, but for a long time, it has eluded its spectral characterization in the gas phase owing to a lack o...

Kloth, J.K.; Zeifang, F.; Weber, M-A., 2015: Clinical or radiological diagnosis of impingement. Shoulder impingement syndrome is a clinically common entity involving trapping of tendons or bursa with typical clinical findings. Important radiological procedures are ultrasound, magnetic resonance imaging (MRI) and MR arthrography. Projection r...

Ignoffo, CM.; Gregory, B., 1972: Effects of Bacillus thuringiensis ss-exotoxin on larval maturation, adult longegity, fecundity, and egg viability in several species of Lepidoptera. Environmental Ent, 13: 269-272

Moshirfar, A.; Jenis, L.G.; Spector, L.R.; Burke, P.J.; Losina, E.; Katz, J.N.; Rand, F.F.; Tromanhauser, S.G.; Banco, R.J., 2006: Computed tomography evaluation of superior-segment facet-joint violation after pedicle instrumentation of the lumbar spine with a midline surgical approach. Study Design. Retrospective study.Objectives. To determine the frequency of pedicle screw violation of superior nonfused facet joints adjacent to the most cephalad pedicle screws after a midline approach for lumbar fusion.Summary of Background Dat...

Gu, Z.; Wang, J.; Ke, X.; Liu, Y.; Liu, X.; Gong, X.; Li, A., 2010: Phylogenetic position of the freshwater fish trypanosome, Trypanosoma ophiocephali (Kinetoplastida) inferred from the complete small subunit ribosomal RNA gene sequence. The complete small subunit rRNA (SSrRNA) gene sequence (2,142 nucleotides) of the freshwater fish trypanosome Trypanosoma ophiocephali Chen (1964) was determined. The phylogenetic analysis deduced using neighbor-joining, maximum parsimony, and Bay...

Carr, R.E.; Lehrer, P.M., 1994: Reply to Ley's "dyspneic-fear theory explains hyperventilatory panic attacks". In a critique of the study by Carr, Lehrer and Hochron (1992), Ley (Behaviour Research and Therapy, 32, 109-111, 1994) attributes the lack of confirmation for his dyspneic-fear theory among panic disorder patients to a basic flaw of that study: Ss...

Domingo A.; Sarria A.J.; Evans R.M.; Klymkowsky M.W., 1992: Studying intermediate filaments. Carraway, K L And C A C Carraway (Ed ) Practical Approach Series: The Cytoskeleton Xviii+268p Irl Press at Oxford University Press: Oxford, England, Uk; New York, New York, Usa Illus 223-255

Chiumello, D.; Cavaliere, F.; D.C.smo, G.; Galante, D.; Pietrini, D., 2011: A year in review in Minerva Anestesiologica, 2010. Minerva Anestesiologica 77(2): 243-256

Jung, M., 1975: Ein neuer Fundort von Synharmonia lyncea (01.). Entomologische Nachren: 158