Catalisadores Cu/Al2O3 promovidos com Co e Zn aplicados à gaseificação de etanol em meio contendo água em condições supercríticas
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2018-07-19
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Universidade Federal de Goiás
Resumo
The great environmental concern, coupled with the risk of depletion of non-renewable raw
material, has driven the search for new sustainable technologies with major concern to the
reduction of pollutant emissions. Hydrogen, a chemical of enormous importance to industrial
plants, stands out as a clean and renewable energy source. This chemical is commonly
produced from non-renewable sources, such as natural gas reforming. Due to specific reaction
conditions, the supercritical water gasification of wet biomass is a promising way for the
production of hydrogen and others high added value fuel gases. Ethanol is an attractive
material because it is renewable, has low toxicity compared to other resources and has high
hydrogen content in its molecule. In order to become this technology viable, a decisive point
is the development of a catalyst aiming at cost reductions and high selectivity to the products
of interest. In this work, ethanol gasification was carried out in supercritical water with
heterogeneous catalysts. The tests were performed on an Inconel Alloy 625 tubular reactor
under the following operating conditions: temperatures of 400, 450, 500, 550, 600 and 650
ºC, pressure of 250 bar, 5 g loading of heterogeneous catalyst, reactor feed: ethanol/water
molar ratio of 1:10 and mass flow rate of 5 g/min. The catalysts were synthesized by wet
impregnation method using aqueous solutions of Cu, Co and Zn nitrates as precursors for the
active phase and spherical pellets of Al 2 O 3 as catalytic support. The catalysts and the catalytic
support were characterized by Thermogravimetry and Differential Thermal Analysis (TG/DTA),
X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), textural analysis by
Adsorption/Desorption Isotherms of N 2 at 77 K and X-Ray Diffraction (XRD). The gasification
results indicated that H 2 production was mainly due to ethanol dehydrogenation. The catalysts
showed higher conversions than observed for catalytic support only. The CuAl catalyst showed
higher H 2 selectivity as well as higher H 2 molar flow at 650 °C. The CoZnAl catalyst showed a
high tendency for C 2 H 4 formation at any reaction temperature, especially at 650 °C.
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MOURÃO, Lucas Clementino. Catalisadores Cu/Al2O3 promovidos com Co e Zn aplicados à gaseificação de etanol em meio contendo água em condições supercríticas. 2018. 111 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2018.