Hydrogen is a promising alternative to meet the world's energy demand, presenting many uses. Fuel cells are the most well-known use in automobiles. But Synthetic fuels is also an promissing alternative. Studies have shown the use of hydrogen as a fuel additive in internal combustion engines. This article aims to present a review of how hydrogen is used as a fuel source, as a replacement option for fossil fuels, reducing the environmental impact and CO2 emissions. Finally, in this review, some advantages and disadvantages will be preseted.

Emissions from the exhaust gases of a diesel engine contain a large number of nanoparticles that are harmful to human health and the environment. The use of fuel optimizers, i.e. fuel additives, potentially reduce emissions, particulate matter (PM), and improve combustion characteristics. In this study, the engine-out exhaust emissions, fuel consumption and particle size distribution emitted from a diesel engine were evaluated using a mixture of 11% biodiesel and 89% mineral diesel (named B11), containing 10 ppm of sulfur; a second blend with an optimizer (called B11x) and a third fuel of 100% mineral diesel (named B0). The engine was kept at a constant load of 15 N.m at a speed of 1700 rpm (BMEP of 0.23 MPa) coupled with a dynamometer. A mobility nanoparticle spectrometer was used, as well as a gas analyzer and a dilution system type CVS (Constant Volume Sampling), which has been used to dilute the exhaust gas to collect the PM. In general, the results of the experiment indicated that the addition of biodiesel promoted an increase in fuel consumption; in the emission of emitted particles and no variations in gaseous emissions. The additive was effective only in reducing particulate emissions under the conditions and concentrations tested.

No mundo globalizado e preocupado com aspectos de sustentabilidade nas edificações, surgem cada vez mais novos sistemas construtivos onde usualmente são pouco conhecidos quanto o seu comportamento ao fogo. No presente artigo é feita uma breve apresentação de eventos de incêndio, no cenário mundial, de edificações cujo sistema de fachadas incorpora material combustível. O intuito do artigo é apresentar os riscos, eventualmente, ocultos dos sistemas de revestimento não aderido, com relação à segurança contra incêndio, tendo em vista sua ampla utilização na região sul brasileira, sobretudo em edifícios altos.

The aim of this study was to evaluate the deposition in the respiratory tract of nanoparticles (11.5nm to 365.2nm) from the burning of diesel, biodiesel and additives. The studied fuels were pure diesel (D), binary mixture of pure diesel with 11% biodiesel (B11) and ternary mixture of pure diesel, with 11% biodiesel and with the biocatalyst Xmile (B11X). The impact of nanoparticles on health was assessed using the MPPD lung model. From the tests, the burning of the studied fuels showed concentration of number of particles in the accumulation mode (50nm to 120 nm). When comparing fuels, it was clear that B11 emits more particles and has a greater deposition capacity in the lung. B11X has been shown to be efficient in reducing pollutant emissions as well as impacting human health.

This study aimed to evaluate the deposition in the respiratory tract of nanoparticles (11.5nm to 365.2nm) from the burning of diesel, biodiesel, and additives. The studied fuels were pure diesel (D), a binary mixture of pure diesel with 11% biodiesel (B11), and a ternary mixture of pure diesel, with 11% biodiesel and with the biocatalyst Xmile (B11X). The impact of nanoparticles on health was assessed using the MPPD lung model. From the tests, the burning of the studied fuels showed a concentration of some particles in the accumulation mode (50nm to 120 nm). When comparing fuels, it was clear that B11 emits more particles and has a greater deposition capacity in the lung. B11X is efficient in reducing pollutant emissions as well as impacting human health.