Effect of Ru on LaCoO₃ perovskite-derived catalyst properties tested in oxidative reforming of diesel

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• 作者：R.M. Navarro ; M.C. Alvarez-Galvan ; J.A. Villoria ; I.D. Gonz&#xe1 ; lez-Jim&#xe9 ; nez ; F. Rosa ; J.L.G. Fierro
• 关键词：LaCoO₃ perovskite ; Ru ; Oxidative reforming ; Diesel ; Hydrogen production
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2007
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：11 May 2007
• 卷：73
• 期：3-4
• 页码：247-258
• 文件大小：1132 K

摘要

The oxidative reforming of diesel over Co/La₂O₃ and Ru–Co/La₂O₃ catalysts derived from LaCoO₃ perovskite precursors was studied. Physicochemical characterization by XPS, TPR and XRD revealed that the incorporation of Ru to LaCoO₃ produces changes in LaCoO₃ evidenced by a smaller size of the LaCoO₃ particles and cobalt segregation on the LaCoO₃ surface. The modifications in the structure of LaCoO₃ induced by the addition of Ru directly affect the dispersion and morphology of Co particles developed under the reaction. The active phases derived from pretreatment of perovskites evolve differently with time on stream, being observed that the presence of a greater proportion of perovskite phase in the Ru/LaCoO₃ sample produces an increase in catalyst stability. TPD-MS analysis also indicates that bulk oxygen release from the Ru–Co/La₂O₃ sample could improve its catalytic behaviour. The characterization of used samples reveals that improvements in the cobalt surface concentration and Co–La₂O₃ interactions contribute to the better catalytic stability of the Ru–Co/La₂O₃-derived catalyst.