Pd-integrated perovskites for TWC applications: Synthesis, microstructure and Nb>2b>O-selectivity

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• 作者：G.C. Mondragó ; n Rodrí ; guez^a ; ^{guillermo.mondragon-rodriguez@dlr.de} ; K. Kelm^a ; S. Heikens^b ; W. Gr&uuml ; 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-LaFeb>0.65b>Cob>0.35b>Ob>3b> and LaFeb>0.65b>Cob>0.3b>Pdb>0.05b>Ob>3b>) 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 Nb>2b>O concentrations were measured and compared to the Nb>2b>O formation of a commercial three way catalyst. The perovskite-based catalysts produced significantly less Nb>2b>O than the TWC - ca. 75%under lean conditions at the temperatures of maximum Nb>2b>O-formation and ca. 60%less Nb>2b>O under stoichiometric conditions. Under rich conditions the Pd-LaFeb>0.65b>Cob>0.35b>Ob>3b> catalyst produced ca. 58%less Nb>2b>O than the TWC, while no Nb>2b>O was detected at all on the Pd-integrated perovskite LaFeb>0.65b>Cob>0.3b>Pdb>0.05b>Ob>3b> under these conditions.