Abstract
The effect of grinding on the catalytic properties of La0.8Sr0.2MnO3±λ powders prepared via a ceramic or sol–gel process was studied with respect to the carbon black combustion temperature (T C). For the ceramic process, a milling time of 5 h led to a decrease of 77°C in the T C (from 615 to 538°C) in relation with increasing BET surface area. Regarding the sol–gel process, the T C decreased from 535 to 505°C after 1 h of grinding. Nevertheless, upon further milling (10 h), the benefit of the grinding effect disappeared due to a continuous decrease in the BET surface area. Finally, grinding (when well controlled) enabled one to obtain ceramic powders showing performances as good as sol–gel materials (T C≈540°C).
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Soiron, S., Aymard, L., Rougier, A. et al. Mechanical Activation of Perovskite-Type Oxides for Catalytic Combustion. Topics in Catalysis 16, 391–395 (2001). https://doi.org/10.1023/A:1016633704286
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DOI: https://doi.org/10.1023/A:1016633704286