The role of aluminum in the formation of Ni–Al–Co-containing porous ceramic converters with high activity in dry and steam reforming of methane and ethanol |
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Authors: | AS Fedotov DO Antonov OV Bukhtenko VI Uvarov VV Kriventsov MV Tsodikov |
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Affiliation: | 1. A.V. Topchiev Institute of Petrochemical Synthesis, RAS, Leninsky Prosp. 29, Moscow 119991, Russia;2. Institute of Structural Macrokinetics and Materials Science, RAS, Chernogolovka, Moscow Oblast 142432, Russia;3. Boreskov Institute of Catalysis, SB RAS, Novosibirsk 630090, Russia |
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Abstract: | The role of aluminum in the formation of Ni–Al–Co-containing porous ceramic membrane-catalytic converters (MCC) obtained by SHS method, which are high-active in dry and steam reforming of methane, ethanol and fusel alcohols into synthesis gas, was discovered. It was shown that the aluminum introduced into the charge through mechanical alloying leads to a significant increase in the catalytic activity of the converter in the studied processes, as compared to aluminum introduced by mechanical mixing. In this case, the addition of 5% aluminum to the initial nickel charge allows achieving of maximum productivity for syngas against other studied concentrations of Al. The Al content increase above the optimum leads to a significant formation of the catalytically inactive phase of Ni3Al intermetallide. TEM and X-ray diffraction methods show that due to oxidation-reduction phase transformations involving aluminum there occurs the formation of metal oxides on the basis of γ-Al2O3 with the structure of spinel having nanosized Ni–Co alloy particles formed on its surface during the reductive activation stage. |
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Keywords: | Dry and steam reforming of methane ethanol and fusel alcohols Syngas and hydrogen production Porous ceramic membrane-catalytic converter Self-propagating high-temperature synthesis (SHS) Structure of catalyst Ni(Al)–Co alloy |
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