Biodiesel CO2 emissions: A comparison with the main fuels in the Brazilian market

Coronado, Christian R.; Carvalho, João Andrade de; Silveira, José Luz

doi:10.1016/j.fuproc.2008.09.006

Cited by 115 publications

(36 citation statements)

References 8 publications

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“…Nevertheless, emissions of NO x may vary by ±10% depending on the engine's combustion characteristics [5]. No sulfur dioxide emissions occur because there is sulfur in biodiesel due to its vegetable origin [6].…”

Section: Introductionmentioning

confidence: 99%

Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production

2012

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Oils with high content of free fatty acid (FFA) can be treated by acid esterification where an alcohol reacts with the given oil in the presence of acid catalyst. The investigated parameters include methanol to oil ratio, temperature and amount of catalyst. The optimum conditions for acid esterification which could reduce FFA content in the feedstock to less than 1.88% (acid value 3.76 mg KOH/g waste cooking oil) were 50 °C, 20% methanol to oil ratio (by volume) and 0.4 vol.% H 2 SO 4 after 5 h. However, oil with an acid value of more than 1 mg KOH/g oil cannot meet the alkaline catalyzed transesterification conditions. Under the conditions of NaOH concentration 0.5 N, excess alkali 15%, 60 °C, 40 min, the FFA removal rate for deacidification reached 77.11% (acid value 0.86 mg KOH/g esterified oil). The acid value of deacidification product was reduced below 0.86 mg KOH/g esterified oil, thus meeting the base-catalyzed trans-esterification conditions.

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Section: Introductionmentioning

confidence: 99%

Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production

2012

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“…The decrease in emissions of unburned hydrocarbons by the addition of biodiesel to the diesel results from the complete combustion of the fuel, during which CO 2 and water are mainly formed, as opposed to what occurs during diesel combustion (Coronado et al 2009). …”

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confidence: 99%

“…This occurs because biodiesel is a vegetable-derived fuel and it is free of sulfur (Coronado et al 2009). …”

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confidence: 99%

Estimated atmospheric emissions from biodiesel and characterization of pollutants in the metropolitan area of Porto Alegre-RS

Teixeira

Mattiuzi

Feltes

et al. 2012

An. Acad. Bras. Ciênc.

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The purpose of the present study was to estimate emissions of some pollutants (CO, NO X , HC, SO X , and PM) in diesel fleet due to the addition of biodiesel in different blends, as well as to assess atmospheric pollutant concentrations in the metropolitan area of Porto Alegre (MAPA). The methodology was based on inventories from mobile sources based on US EPA's technical report. Regarding air quality the following parameters were determined: PM 10 , PM 2.5 , CO, NO X , O 3 , SO 2 , HC and PAHs. The results showed a decrease for emissions PM, CO, and HC, and a slight increase for NO X . The characterization of atmospheric pollutants in the metropolitan area of Porto Alegre showed that they are influenced by mobile sources, particularly diesel vehicles. The diagnosis of ratios analysis that was applied to facilitate the identification of sources of PAHs, indicated an influence of diesel oil.

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“…Figure 6 shows an increase in NO X emissions when biodiesel was added. This might be explained due to the high oxygen levels in biodiesel molecules and to improved combustion conditions: temperature and pressure in the combustion chamber are higher, boosting the formation of larger amounts of nitrogen oxides in engines running on biodiesel, by combining oxygen with the nitrogen present in the air (Coronado et al, 2009). Figure 7 shows the decrease in carbon monoxide emissions with the increase in biodiesel percent in the blend.…”

Section: Air Quality 321 Sampler Automaticsmentioning

confidence: 99%

Estimated Atmospheric Emissions from Mobile Sources and Assessment of Air Quality in The Urban Area

Teixeira¹,

Mattiuzi²,

Wiegand³

et al. 2011

Air Quality Monitoring, Assessment and Management

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Biodiesel CO2 emissions: A comparison with the main fuels in the Brazilian market

Cited by 115 publications

References 8 publications

Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production

Esterification and Deacidification of a Waste Cooking Oil (TAN 68.81 mg KOH/g) for Biodiesel Production

Estimated atmospheric emissions from biodiesel and characterization of pollutants in the metropolitan area of Porto Alegre-RS

Estimated Atmospheric Emissions from Mobile Sources and Assessment of Air Quality in The Urban Area

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