Energy and Transportation Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA).
Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA).
Angew Chem Int Ed Engl. 2015 Nov 2;54(45):13263-7. doi: 10.1002/anie.201506093. Epub 2015 Sep 11.
Platinum group metal (PGM) catalysts are the current standard for control of pollutants in automotive exhaust streams. Aside from their high cost, PGM catalysts struggle with CO oxidation at low temperatures (<200 °C) due to inhibition by hydrocarbons in exhaust streams. Here we present a ternary mixed oxide catalyst composed of copper oxide, cobalt oxide, and ceria (dubbed CCC) that outperforms synthesized and commercial PGM catalysts for CO oxidation in simulated exhaust streams while showing no signs of inhibition by propene. Diffuse reflectance IR (DRIFTS) and light-off data both indicate low interaction between propene and the CO oxidation active site on this catalyst, and a separation of adsorption sites is proposed as the cause of this inhibition resistance. This catalyst shows great potential as a low-cost component for low temperature exhaust streams that are expected to be a characteristic of future automotive systems.
铂族金属（PGM）催化剂是当前控制汽车尾气污染物的标准。除了成本高之外，PGM 催化剂在低温（<200°C）下的 CO 氧化也存在困难，因为尾气中的碳氢化合物会抑制其反应。本文介绍了一种由氧化铜、氧化钴和氧化铈组成的三元混合氧化物催化剂（简称 CCC），在模拟尾气中进行 CO 氧化时，其性能优于合成和商业 PGM 催化剂，而且对丙烯没有表现出抑制作用。漫反射红外（DRIFTS）和起燃数据均表明，丙烯与该催化剂上 CO 氧化活性位之间的相互作用较弱，提出了吸附位分离是这种抑制抗性的原因。这种催化剂作为未来汽车系统中预期具有的低温尾气的低成本组件具有很大的潜力。
