Correlation cataluminescence (CTL) property with reactivity of hydrothermally synthesized La < inf> 0.8 Sr < inf> 0.2 MnO < inf> 3 cubes and CTL as a rapid mode of screening catalyst

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La 0.8Sr 0.2MnO 3 cubes and nanoparticles were prepared by hydrothermal and citrate methods, respectively. Their cataluminescence (CTL) properties and catalytic reaction activities for CO were mainly investigated. The samples were characterized by XRD, SEM, TEM, LRS, BET, CO-TPD, O 2-TPD, and H 2-TPR, etc. It was found that both crystal structure and surface area of the catalyst play the important roles in CO oxidation. Before being calcined at high temperatures, La 0.8Sr 0.2MnO 3 nanoparticles showed the higher CTL intensity and catalytic activity for CO oxidation than the cubes, in which the effect of BET area of the catalyst on the catalytic properties is obvious; after being calcined at high temperatures, nevertheless, the cubes showed a higher CTL intensity and catalytic activity than the particles, in which the crystal structure played a significant role in CO oxidation. Most importantly, the CTL intensity of the catalyst was well correlated with the catalytic reaction activity (CO conversion or apparent reaction rate). A CTL mode could be used as a rapid method for screening catalyst activity. © 2009 American Chemical Society.

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Journal of Physical Chemistry C