کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
39744 | 45834 | 2014 | 10 صفحه PDF | دانلود رایگان |
• Reducibility and nanostructure are experimentally related in commercial ceria.
• Rietveld analysis and HREM show nanoparticles induce low temperature Ce4+ reduction.
• Kinetic and theoretical models are supported by morphological characterization.
• Key parameters to select appropriate CeO2 samples for catalytic uses are unveiled.
Two commercial high BET surface areas CeO2 are characterized, as received and after calcination at different temperatures, to better understand the relationship between reducibility and micro- and nanostructure. Combination of TPR data, Rietveld analysis of XRD diagrams and HREM/HAADF-STEM suggest that the nano-particles are responsible for Ce4+ reduction in the moderate temperature range. Results obtained in this work show that previous models based on kinetic and theoretical analysis can be fully supported by morphological characterization. This study unveils the key parameters that must be known in order to select appropriate commercial ceria samples.
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Journal: Applied Catalysis A: General - Volume 479, 5 June 2014, Pages 35–44