Setembro 2025 vol. 12 num. 1 - XXXII Simpósio Internacional de Engenharia

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Especiação de hidrocarbonetos nas emissões de veículos flex-fuel representativos da fase Proconve L7 com gasolina E22 e etanol hidratado

Speciated hydrocarbons in exhaust emissions of Proconve L7 flex fuel vehicles using E22 gasohol and hydrous ethanol

CARVALHO, Rogério Nascimento de ; RIBEIRO, Douglas Guerreiro ; SOUZA, João Maximino de ; MELO, Tadeu Cavalcante Cordeiro de ; VICENTINI, Pedro Caffaro ;

Trabalho completo:

Este estudo aborda a especiação de hidrocarbonetos nas emissões gasosas de veículos flex-fuel da fase Proconve L7 usando gasolina padrão E22 e etanol hidratado, que é necessária para a obtenção dos coeficientes de Máxima Reatividade Incremental (MIR) aplicados no cálculo das emissões de NMOG (gases orgânicos não metano). Os NMOG combinados com o NOx (óxidos de nitrogênio) e na presença de luz solar, são os principais precursores de ozônio na troposfera e passaram a ser regulados no Brasil a partir da 2022 com a fase L7 do Proconve. A especiação dos hidrocarbonetos, na faixa dos compostos C2 a C12, foi realizada em sistema de cromatografia gasosa acoplado a um espectômetro de massas e calibrado com gás padrão recomendado pela CARB, com amostras dos gases de escape coletadas em esferas metálicas inertes. Foram avaliados veículos de injeção indireta (PFI) e direta (GDI) de combustível, com os canisters saturados com butano, no ciclo de condução urbana (NBR-6601). Os resultados foram similares aos de trabalhos anteriores da Petrobras com veículos Proconve L4 a L6, contendo compostos típicos da combustão de gasolina nos testes com E22 e teores de compostos C2 (eteno, etano e etino) em torno de 98% com etanol, não havendo evidências de contaminação das amostras.

Trabalho completo:

This paper addresses the speciation of hydrocarbons from the exhaust emissions of Proconve L7 flex fuel vehicles using standard E22 gasohol and hydrous ethanol, which is necessary to obtain the Maximum Incremental Reactivity (MIR) coefficients applied in the NMOG (non-methane organic gases) emissions calculation. NMOG combined with NOx (nitrogen oxides) in the presence of sunlight are the main precursors of ozone in the troposphere and are regulated in Brazil from the Proconve L7 phase since 2022. Hydrocarbons speciation, in the range of C2 to C12, were performed in a gas chromatograph coupled to a mass spectrometer detector and a flame ionization detector (FID), using inert metallic spheres for sampling and a standard reference gas mixture for calibration. Proconve L7 flex-fuel vehicles with port-fuel (PFI) and direct fuel injection systems (GDI) were evaluated with the canisters saturated with butane, following the NBR 6601 standard urban driving cycle. Results were consistent with previous studies of Petrobras with Proconve L4 to L6 vehicles, presenting typical hydrocarbons species of gasohol combustion in the tests with E22 and for the hydrous ethanol tests around 98% of C2 compounds (ethene, ethane and acetylene) with no evidence of samples contamination.

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DOI: 10.5151/simea2025-PAP70

Referências bibliográficas
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Como citar:

CARVALHO, Rogério Nascimento de; RIBEIRO, Douglas Guerreiro; SOUZA, João Maximino de; MELO, Tadeu Cavalcante Cordeiro de; VICENTINI, Pedro Caffaro; "Especiação de hidrocarbonetos nas emissões de veículos flex-fuel representativos da fase Proconve L7 com gasolina E22 e etanol hidratado", p. 349-355 . In: Anais do XXXII Simpósio Internacional de Engenharia. São Paulo: Blucher, 2025.
ISSN 2357-7592, DOI 10.5151/simea2025-PAP70

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