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NOx

About: NOx is a research topic. Over the lifetime, 26367 publications have been published within this topic receiving 496555 citations.


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Journal ArticleDOI
TL;DR: It is suggested that SO2, and by inference acidic aerosol, may play a role in increasing the yield of SOC from the photooxidation products of biogenic hydrocarbons or by the direct uptake ofBiogenic Hydrocarbons onto acidic aerosols.
Abstract: A laboratory study was carried out to investigate the secondary organic carbon (SOC) yields of α-pinene and isoprene in the presence of SO2, which produces acidic aerosol in the system. Experiments were based on irradiating each hydrocarbon (HC) with NOx in a 14.5 m3 smog chamber operated in the dynamic mode. The experimental design consisted of several multi-part experiments for each HC. In the first part of each experiment, an HC/NOx irradiation was conducted in the absence of SO2 and was followed by irradiations with the addition of SO2 in subsequent parts. Filter-based analyses for organic carbon were made using a thermal-optical approach either with an off-line instrument or in situ with an automated instrument. For isoprene in the absence of SO2, the SOC yield was approximately 0.001, a value consistent with earlier work from this laboratory. With the addition of up to 200 ppb SO2, the yield increased by a factor of 7. For α-pinene in the absence of SO2, the SOC yield of the irradiated mixture was f...

158 citations

Journal ArticleDOI
04 Jun 2004-Science
TL;DR: Ship-borne ozone (O3) measurements over the Atlantic Ocean during the period from 1977 to 2002 show that O3 trends in the northern mid-latitudes are small, while remarkably large O3 Trends occur at low latitudes and in the Southern Hemisphere, where near-surface O3 has increased by up to a factor of 2.
Abstract: Ship-borne ozone (O3) measurements over the Atlantic Ocean during the period from 1977 to 2002 show that O3 trends in the northern mid-latitudes are small. In contrast, remarkably large O3 trends occur at low latitudes and in the Southern Hemisphere, where near-surface O3 has increased by up to a factor of 2. The likely cause is the substantial increase of anthropogenic emissions of nitrogen oxides (NOx) associated with energy use in Africa, which has added to NOx from biomass burning and natural sources.

157 citations

Journal ArticleDOI
TL;DR: In this article, the preparation methods and physicochemical properties of biodiesel-based fuels containing Cerium Oxide (CeO2) nanoparticles were fully introduced, and the effects of CeO2 on the atomization and micro-explosion of as-used fuels were also discussed in detail.

157 citations

Journal ArticleDOI
TL;DR: In this article, the selective catalytic reduction of nitrogen oxides has been studied in the presence of O2 over Fe/MFI catalysts with Fe/Al∼1, prepared by sublimation of FeCl3 vapor onto HMFI.

157 citations

Journal ArticleDOI
TL;DR: In this article, the performance and emission of a CI single-cylinder engine were evaluated using the CNTs with the concentrations of 30, 60, and 90ppm for each fuel blend.

157 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,699
20223,249
20211,405
20201,353
20191,367