Strontium-Doped Perovskites Rival Platinum Catalysts for Treating NOx in Simulated Diesel Exhaust
Strontium-Doped Perovskites Rival Platinum Catalysts for Treating NOx in Simulated Diesel Exhaust
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DOI：
10.1126/science.1184087
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发表时间：
2010-03-26
期刊：
影响因子：
56.9
通讯作者：
Li, Wei
中科院分区：
文献类型：
--
作者：
Kim, Chang Hwan;Qi, Gongshin;Li, Wei
目前的贫氮氧化物（NOx）后处理催化剂成本高，热耐久性差，是阻碍高效柴油发动机广泛采用的两大主要障碍。我们展示了在柴油氧化（DOC）和贫氮氧化物捕集器（LNT）催化剂中使用掺锶钙钛矿氧化物作为高效铂替代品。在目前的柴油后处理系统中，NO氧化反应是需要大量使用铂的关键步骤，而涂覆在整体衬底上的镧基钙钛矿催化剂表现出优异的活性。在实际条件下，La1-xSrxCoO3催化剂的NO-to-NO2转化率高于商业铂基DOC催化剂。同样，la0.9 sr0.1 mno3基LNT催化剂的NOx还原性能与商用铂基催化剂相当。研究结果表明，这是一种相当低成本的柴油废气处理系统。
The high cost and poor thermal durability of current lean nitrogen oxides (NOx) aftertreatment catalysts are two of the major barriers to widespread adoption of highly fuel-efficient diesel engines. We demonstrated the use of strontium-doped perovskite oxides as efficient platinum substitutes in diesel oxidation (DOC) and lean NOx trap (LNT) catalysts. The lanthanum-based perovskite catalysts coated on monolith substrates showed excellent activities for the NO oxidation reaction, a critical step that demands heavy usage of platinum in a current diesel aftertreatment system. Under realistic conditions, La1-xSrxCoO3 catalysts achieved higher NO-to-NO2 conversions than a commercial platinum-based DOC catalyst. Similarly, a La0.9Sr0.1MnO3-based LNT catalyst achieved NOx reduction performance comparable to that of a commercial platinum-based counterpart. The results show promise for a considerably lower-cost diesel exhaust treatment system.