Influence of the nature of the lanthanide element of Ln₂CuO₄ precursors on the catalytic activity obtained after activation in the CO + NO reaction

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• 作者：Peter ; Stefan D. ; Garbowski ; É ; douard ; Perrichon ; Vincent ; Primet ; Michel
• 关键词：La₂CuO₄ ; Lanthanide cuprate ; Praseodymium ; Neodymium ; CO + NO reaction ; La₂CuO₄ ; Cuprate de lanthanide ; Prasé ; odyme ; Né ; odyme ; Ré ; action CO + NO
• 刊名：Comptes Rendus Chimie
• 出版年：2004
• 期刊代码：119_16310748
• 类别：ch
• 出版时间：January, 2004
• 卷：7
• 期：1
• 页码：57-61
• 文件大小：173 K

摘要

Three lanthanide cuprates Ln₂CuO₄ (Ln = La, Pr and Nd) have been studied in the CO + NO reaction. Under reaction conditions, a reduction of the cuprate was observed, with formation of metallic copper, which constitutes the active species in the reaction. After stabilisation, the resulting activity is lower when La in La₂CuO₄ is replaced by Pr or Nd. This decrease in activity has been related to a different reducibility of the cuprates, as shown by TPR under H₂. When La is substituted by Pr or Nd, a higher temperature of formation of the copper active sites should induce the growth of bigger copper particles, which could be at the origin of the observed difference in activity. To cite this article: S.D. Peter et al., C. R. Chimie 7 (2004).