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Cientistas dos EUA criam biocombustível de frutas

O açúcar encontrado em frutas como maçãs e laranjas pode ser convertido em um novo tipo de combustível com emissão reduzida de dióxido de carbono para os carros, de acordo com cientistas americanos.

O combustível, feito a partir de frutose, tem várias vantagens sobre o etanol, segundo artigo dos pesquisadores na revista Nature.

Cientistas da Universidade de Wisconsin-Madison dizem que a frutose pode ser convertida em um combustível chamado dimetilfurano, que pode armazenar 40% mais energia do que o etanol, não evapora tão facilmente e é menos volátil.

Os cientistas dizem que a frutose pode ser obtida diretamente de frutas e plantas ou obtido a partir da glicose. Mas, segundo os cientistas, ainda seriam necessárias mais pesquisas para verificar o impacto ambiental deste novo combustível.

Biodiesel

Um outro relatório sobre biocombustíveis feito na Grã-Bretanha disse que já existe tecnologia para criar biodiesel não apenas de azeite de dendê, mas também de uma gama de materiais, inclusive madeira, ervas e sacos plásticos.

Especialistas dizem que dentro de seis anos até 30% da demanda por diesel no país pode vir dessa fonte.

Jeremy Tomkinson, do National Non-Food Crops Centre da Grã-Bretanha (Centro Nacional para Colheitas Não-Alimentícias da Grã-Bretanha, em tradução livre), disse que esta próxima geração de biocombustíveis pode atender a outras necessidades, além de movimentar veículos.

“Imagine se componentes químicos industriais ou o combustível de aviões também vierem dessas fontes…Há um grande potencial”, disse ele.

O maior problema neste processo é o custo.

Estima-se que novas instalações para a produção deste tipo de combustível custem até dez vezes mais do que as atuais refinarias de biodiesel.

Tanto na União Européia quanto nos Estados Unidos, políticos defendem o uso de biocombustíveis para reduzir emissões de dióxido de carbono e a dependência da importação de petróleo.

Mas críticos dizem que os atuais biocombustíveis – tanto diesel feito de azeite de dendê quanto etanol feito de milho e cana-de-açúcar – encorajam os agricultores a optarem por estas culturas para produzir combustíveis.

O processo já estaria levando a um aumento no custo dos alimentos, alegam.

Fonte: BBC Brasil
Por: Matt McGranth




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