Pesquisa aponta etanol como melhor combustível
Álcool produz menos monóxido de carbonoA partir de pesquisas que fez e de outros trabalhos publicados, o professor Sergio Machado Corrêa, do Departamento de Química Ambiental da Uerj, não tem dúvidas: o etanol (álcool) é o combustível menos poluente. Relatório do inventário nacional de emissões atmosféricas de 2011, feito pelo Ministério do Meio Ambiente, mostra que, na média, veículos automotores movidos à gasolina comum produzem menos monóxido de carbono (CO) e óxido de nitrogênio (NOx) do que os que usam etanol hidratado. Em hidrocarbonetos (NMHC) e aldeídos (RCHO), a vantagem é da gasolina.- O CO e o NOx são mais tóxicos dos que os outros dois gases. Além disso, o etanol é renovável. Para obtê-lo, é preciso plantar cana de açúcar, que retira gás carbônico da atmosfera. É um ciclo fechado. O álcool é menos poluente até que o gás natural veicular, sendo que a qualidade do kit melhorou desde que foi implantado no fim dos anos 1990. O álcool polui tanto quanto o gás, só que...
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