Abstract
Barium hexaaluminates partially substituted by copper have been synthesized by a sol–gel method. Formation of the parent BaAl12O19 and the mixed BaCuAl11O18.5 catalysts occurred during calcination at 1200°C. XRD showed a good crystallinity of the structure and expansion of the unit cell parameter due to the presence of larger mathrmCu2 + ions in place of Al 3+ in tetrahedral sites. The presence of copper strongly enhances the catalytic activity in methane combustion, which should be due to the Cu2+ species evidenced by FTIR of adsorbed CO and by TPR. The introduction of a second copper ion in the structure was not possible, however, as revealed by the formation of copper (II) aluminate in addition to the Cu-substituted hexaaluminate phase.
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Artizzu, P., Guilhaume, N., Garbowski, E. et al. Catalytic combustion of methane on copper-substituted barium hexaaluminates. Catalysis Letters 51, 69–75 (1998). https://doi.org/10.1023/A:1019032917062
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DOI: https://doi.org/10.1023/A:1019032917062