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Steam reforming of methane over Ni-substituted Sr hexaaluminates

100%
Bukhtiyarova M., Ivanova A., Slavinskaya E., Kuznetsov P., Plyasova L., Stonkus O., Rogov V., Kaichev V., Noskov A.
Catalysis for Sustainable Energy
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2012
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vol. 1
11-21
EN
Ni-substituted Sr-aluminates Sr1-xNixAl11.2+xNi0.8-xO19-δ (x = 0; 0.2; 0.4; 0.8) obtained by a precipitation method and calcined at 1200°C have been characterized by different physicochemical techniques and their catalytic properties have been tested in steam reformation of methane. It has been shown that substitution of Al3+ and/or Sr2+ by Ni2+ in the aluminate structure results in changes of phase composition, specific surface area, and reducibility of samples. It has been established that the samples are not completely reduced in the temperature range of 30-900°C. The Sr1-xNixAl11.2+xNi0.8-xO19-δ (x = 0; 0.2; 0.4) catalysts are active and stable in the steam reforming of methane at 700oC: residual amount of methane is (1.1±1.0) vol.%, while the Sr1-xNixAl11.2+xNi0.8-xO19-δ (x = 0.8) sample is rapidly deactivated by coking.
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Production of hydrogen from steam reforming of glycerol using nickel catalysts supported on Al2O3, CeO2and ZrO2

88%
Manfro R. L., Ribeiro N. F. P., Souza M. M. V. M.
Catalysis for Sustainable Energy
|
2012
|
vol. 1
60-70
EN
Nickel catalysts supported on Al2O3, CeO2 and ZrO2 were prepared by wet impregnation method and evaluated in steam reforming of glycerol. The catalysts were characterized by chemical composition, textural analysis, crystalline structure and reducibility. The structural characterization of the catalysts revealed a good dispersion of Ni particles using the Al2O3 support, needing higher reduction temperature. The reactions were performed at 500°C with 10 vol.% glycerol solution in a continuous flow reactor. All catalysts showed conversions close to 100%. The selectivity to gas products and formation of liquid by-products were found to be dependent on the type of support. The H2 selectivity showed the following trend: ZrO2 > Al2O3 ≈ CeO2. The catalyst supported on CeO2 showed low activity for water-gas shift reaction, with the highest CO selectivity. All catalysts presented a low formation of CH4. In the liquid phase some by-products were identified (hydroxyacetone, acetic acid, lactic acid, acetaldehyde, acrolein and ethanol) and secondary reaction routes were proposed. Coke formation was higher on Ni/Al2O3 catalyst, but no deactivation was observed during 8 h of reaction.
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