659 resultados para Jesucristo-Natividad-Villancicos


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Gas-to-liquid processes are generally used to convert natural gas or other gaseous hydrocarbons into liquid fuels via an intermediate syngas stream. This includes the production of liquid fuels from biomass-derived sources such as biogas. For example, the dry reforming of methane is done by reacting CH4 and CO2, the two main components of natural biogas, into more valuable products, i.e., CO and H2. Nickel containing perovskite type catalysts can promote this reaction, yielding good conversions and selectivities; however, they are prone to coke laydown under certain operating conditions. We investigated the addition of high oxygen mobility dopants such as CeO2, ZrO2, or YSZ to reduce carbon laydown, particularly using reaction conditions that normally result in rapid coking. While doping with YSZ, YDC, GDC, and SDC did not result in any improvement, we show that a Ni perovskite catalyst (Na0.5La0.5Ni0.3Al0.7O2.5) doped with 80.9 ZrO2 15.2 CeO2 gave the lowest amount of carbon formation at 800 °C and activity was maintained over the operating time.

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Tese de mestrado, Estudos Clássicos, Universidade de Lisboa, Faculdade de Letras, 2011

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Tese de doutoramento, Estudos de Literatura e Cultura (Literatura Oral e Tradicional), Universidade de Lisboa, Faculdade de Letras, 2014

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Tesis (Maestría en Salud Pública con Especialidad en Salud en el Trabajo) UANL

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UANL

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UANL

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UANL

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UANL