Rare-Earth Manganites: Surface-Segregated Platinum Increases Catalytic Activity
Rare-Earth Manganites: Surface-Segregated Platinum Increases Catalytic Activity
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稀土锰酸盐：表面偏析的铂可提高催化活性
DOI：
10.1126/science.194.4262.318
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发表时间：
1976
期刊：
影响因子：
56.9
通讯作者：
S. Katz
中科院分区：
文献类型：
--
作者：
J. Croat;G. Tibbetts;S. Katz
破碎和蚀刻的镧铅锰酸盐（La0.7Pb0.3MnO3）晶体中铂的原子率仅为0.005，其催化活性显著高于游离铂晶体。这种较高的活性是由于铂在表面的近100倍偏析。发现的表面铂浓度为0.5个原子百分比，足以说明活性增强，前提是铂与氧化铝上的铂具有相同的活性。
Crushed and etched lanthanum lead manganite (La0.7Pb0.3MnO3) crystals containing as little as 0.005 atomic percent platinum have significantly higher catalytic activity than free platinum crystals. This higher activity is due to an almost 100-fold segregation of platinum on the surface. The surface platinum concentration found, 0.5 atomic percent, is sufficient to account for the enhanced activity provided that the platinum has the same activity as platinum supported on alumina.