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• W1971486978 abstract "CuO−CeO2 mixed oxide catalysts with 10, 15, and 20 mol % CuO content were prepared by the hard template method using KIT-6 silica as a template. The applied synthesis method yields solids with BET surface area in excess of 147 m2/g, highly porous nanocrystalline CeO2 morphology and dispersion of CuO phase between 28 and 40%, corresponding to CuO particle size between 1.3 and 1.9 nm. Increasing the CuO content caused a decrease in dispersion of this phase and a further decrease of surface acid site abundance, determined by NH3 chemisorption/TPD method, but improved the reducibility extent of CeO2 (14.5, 16.1 and 24.5% for CuCe10, CuCe15, and CuCe20 catalyst, respectively) and oxygen mobility of prepared powders. It was discovered during ethanol steam re-forming experiments that increasing CuO content is favorable in terms of ethanol conversion but also causes quicker catalyst deactivation, primarily as a result of sintering and loss of CuO dispersion. Reaction temperatures in excess of 550 °C strongly promoted ethanol dehydratation reaction, leading to a rise in methane production and extensive coking of the catalyst surface. Coking was slower in the case of CuO−CeO2 catalysts with a higher CuO content as a result of lower acid site abundance and more pronounced oxygen mobility. Temperatures in excess of 450 °C are required for any noticeable CO2 and CH4 conversion in methane dry re-forming reaction over CuO−CeO2 materials. The examined materials displayed steady performance during stability tests at a reaction temperature of 650 °C, with catalysts containing 15 and 20 mol % CuO exhibiting the highest activity. Additionally, very low amounts of carbon were deposited on spent catalyst samples." @default.
• W1971486978 created "2016-06-24" @default.
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• W1971486978 date "2009-11-02" @default.
• W1971486978 modified "2023-09-27" @default.
• W1971486978 title "Utilization of High Specific Surface Area CuO−CeO₂ Catalysts for High Temperature Processes of Hydrogen Production: Steam Re-forming of Ethanol and Methane Dry Re-forming" @default.
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• W1971486978 doi "https://doi.org/10.1021/jp907345u" @default.
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