CO2 laser photoacoustic detection of ethylene emitted by diesel engines used in urban public transports

Teodoro, C G; Schramm, D.U.; Sthel, Marcelo Silva; Lima, Guilherme Rodrigues; Rocha, Mila Vieira da; Tavares, Juliana; Vargas, H.

doi:10.1016/j.infrared.2009.10.009

Cited by 22 publications

(13 citation statements)

References 15 publications

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“…The results of this research corroborate with data obtained in researches carried out in Campos dos Goytacazes by Geórgia et al [8], Geórgia et al [21]; and Carla et al [27]. Therefore, this makes it possible to assess that the gaseous emissions from combustion in automotive vehicles still show a pattern of possible polluting gases in the ppmv range, which depending on the type of vehicle and year influence the variations in emissions.…”

Section: Gaseous Emissions (Detection Of Co No and No2)supporting

confidence: 89%

Emission of Air Pollution in the Transport Sector: Case Study of the City of Campos dos Goytacazes, Brazil

Lima¹,

Sthel²

2020

ENG

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Section: Gaseous Emissions (Detection Of Co No and No2)supporting

confidence: 89%

Emission of Air Pollution in the Transport Sector: Case Study of the City of Campos dos Goytacazes, Brazil

Lima¹,

Sthel²

2020

ENG

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“…For this, TEMPEST Electrochemical Analyzer to detect carbon monoxide (CO), the nitrogen oxides NO x (NO+ NO 2 ) in the range of ppmv and the infrared analyzer (URAS), to detect carbon dioxide (CO 2 ). We also carried out the calibration of a photoacoustic spectrometer coupled to a CO 2 laser, which allows us to perform the detection of ethylene (VOCs) in the range of ppbv [23,[47][48][49].…”

Section: Ethanol and Biodiesel: Gaseous Emissionsmentioning

confidence: 99%

Evaluation of Gaseous Emission in the Use of Biofuels in Brazil

Sthel¹,

Rocha²,

Tavares³

et al. 2013

Biofuels - Economy, Environment and Sustainability

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to about -%, dependinμ on λuture oil and carbon prices, improvements in veνicle eλλiciency and tνe success oλ tecνnoloμy in tνe use oλ cellulosic biomass [ , ].Policies aimed at solvinμ issues sucν as traλλic conμestion, air quality and enerμy security are closely associated witν emission reductions in tνe transportation sector.Currently, tνe transport matrix in Brazil is predominantly by road, witν intensive use oλ λossil λuel sources diesel and μasoline . Tνus, tνe μovernment created two proμrams tνat encouraμe tνe use oλ bioλuels in tνe transport sector tνe Biodiesel National Proμram and tνe Etνanol National Proμram. Currently, all diesel λuel sold in Brazil νas % oλ biodiesel B , wνereas tνe μasoline used in tνe veνicles νas % oλ etνanol. Recently, witν tνe increased use oλ λlex-λuel veνicles, wνicν may be λueled witν μasoline and etνanol in varyinμ percentaμes, tνe use oλ bioλuels becomes more prominent.Brazil νas a μreat ability to produce bioenerμy, once it is a tropical country insolation , witν extensive arable lands, reμular rainλall, water resources and ricν biodiversity, enablinμ tνe success oλ etνanol and biodiesel proμrams.Tνe use oλ bioλuels νas μenerated controversy in tνe scientiλic, tecνnical and policy areas around tνe world [ -], particularly in reμard to emissions oλ carbon dioxide, oil prices, λuel and λood security, destruction oλ λorests, soil erosion, impacts on water resources, enerμy balance and enerμy security.In relation to tνe μreenνouse eλλect, not only tνe carbon dioxide emissions λrom burninμ λuels must be considered, but tνe νole production cνain. It is necessary to consider tνe use oλ nitroμen λertilizers, tνe land use and nitrous oxide emissions [ -]. In tνe case oλ etνanol, we must consider tνe emissions μenerated by aμricultural macνines, suμarcane transportation, etνanol transportation to consumption centers, μeneration oλ carbon dioxide durinμ tνe λermentation oλ etνanol and tνe enerμy source tνat powers tνe etνanol industry. Similar concern sνould be considered in tνe production cycle oλ biodiesel, produced predominantly λrom soybean in Brazil. All tνese criteria need to be evaluated in tνe sustainability studies oλ bioλuels production cνain.Tνis cνapter presents some environmental aspects oλ Brazilian studies bioλuels biodiesel and etνanol evaluatinμ pollutant emissions λrom μasoline and etνanol veνicles exνaust and also λrom bencν enμines powered by biodiesel and diesel. Furtνermore, we evaluated tνe emissions oλ μreenνouse μases in suμarcane soils.For tνis study, we used tecνniques tνat ensure νiμν selectivity to identiλy tνe μaseous species in a mixture oλ μases, νiμν sensitivity λor detectinμ low concentrations oλ μases, μood temporal resolution and tνe possibility oλ online measurements. Tνe pνotoacoustic tecνnique νas all tνe cνaracteristics to be used in tνese measurements.Pνotoacoustic spectroscopy is used λor tνe detection oλ several μases in tνe concentration ranμe oλ parts per billion by volume ppbv and sub-ppbv [ -]. Tνis metνodoloμy is based on tνe μeneratio...

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“…For this reason, this chemical species is a precursor for the generation of the tropospheric ozone , which is present in photochemical smog and directly affects human health. Besides, ozone is a powerful greenhouse gas, whose formation is greatly potentiated by the incidence of sun radiation and the presence of nitrogen oxides (NO x ) (Yu & Kung, 1999;McCulloch et al, 2005;Teodoro et al, 2010). According to the Intergovernmental Panel of Climatic Changes (IPCC), ozone has a positive radiative forcing of about 0.35 W/m 2 , being, therefore, an important source of global warming.…”

Section: Co 2 Laser Experimental Setupmentioning

confidence: 99%