ProduÃÃo de gÃs de sÃntese por tri-reforma do metano em reator de leito fixo

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The ever increasing availability of natural gas (NG), and the abundant carbonic gas production, via fermentation of most prepared from sugar cane products (sugar cane juice, and molasses), thermoelectric generators, and refineries have enhanced the research interest of these commodities. The indirect NG conversion processes to synthesis gas (CO and H2), the intermediate for hydrocarbons, fuel, and oxygenated compounds production. The tri-reforming of methane (TRM) is a synergetic combination of dry reforming of methane (DRM), partial oxidation of methane (POM), and the steam reforming of methane (SRM). The combination of dry and steam reforming can solve two important problems; produce syngas in the desired H2/CO proportions, and evaluate the carbon production which is an important problem in dry reforming. This work evaluated the results obtained of the natural gas conversion via tri-reforming of methane employing a nickel catalyst supported on -alumina (Ni/-Al2O3). The operational evaluations were performed in a temperature range of 650 to 850ÂC under atmospheric pressure. The oxygen in the feed increased the yields of hydrogen and carbon monoxide production. Maximum conversions for CH4, 96.44%, and for CO2, 45.41%, and maximum selectivities for H2, 92.55% and CO, 8.61% were obtained. The yields of H2, and CO were 4.4, and 0.25% respectively, due to the water-gas shift reaction (RWGS), which was minimized with the temperature increase to 950ÂC when the yields increased to 37,00 and 5,00% for H2 e CO. For the catalyst characterization the following techniques were employed: atomic absorption, X-ray, thermal analysis, infra-red with Fourier transform (FTIR), area via Brunauer, Emmet and Teller (BET), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) carbon elementary analysis before and after the reactions, in order to analyze the catalyst stability and its catalytic capacity. A kinetic mechanism was also proposed and experimentally validated

ASSUNTO(S)

nickel catalyst synthesis gas engenharia quimica gÃs de sÃntese tri-reforma do metano tri-reforming of methane catalisador de nÃquel

ACESSO AO ARTIGO

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