Pd-integrated perovskites for TWC applications: Synthesis, microstructure and N₂O-selectivity

详细信息	查看全文 | 推荐本文 |

• 作者：G.C. Mondragó ; n Rodrí ; guez^a ; ^{guillermo.mondragon-rodriguez@dlr.de} ; K. Kelm^a ; S. Heikens^b ; W. Grü ; nert^b ; B. Saruhan^a
• 关键词：Pd-integrated perovskite ; TWC ; N2O-formation
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：30 April, 2012
• 卷：184
• 期：1
• 页码：184-191
• 文件大小：1287 K

摘要

Two versions of Pd-doped perovskite based catalysts (Pd impregnated onto or integrated into perovskite: Pd-LaFe_0.65Co_0.35O₃ and LaFe_0.65Co_0.3Pd_0.05O₃) were synthesized by applying a modified citrate route and analyzed by XRD, TEM and XPS. The catalytic properties of the perovskites were measured for NO reduction reactions occurring in three way catalysis, including lean, stoichiometric and rich conditions. The N₂O concentrations were measured and compared to the N₂O formation of a commercial three way catalyst. The perovskite-based catalysts produced significantly less N₂O than the TWC - ca. 75%under lean conditions at the temperatures of maximum N₂O-formation and ca. 60%less N₂O under stoichiometric conditions. Under rich conditions the Pd-LaFe_0.65Co_0.35O₃ catalyst produced ca. 58%less N₂O than the TWC, while no N₂O was detected at all on the Pd-integrated perovskite LaFe_0.65Co_0.3Pd_0.05O₃ under these conditions.