Copper–Cobalt–Cerium Ternary Oxide as an Additive to a Conventional Platinum‐Group‐Metal Catalyst for Automotive Exhaust Catalysis,ChemCatChem

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Copper–Cobalt–Cerium Ternary Oxide as an Additive to a Conventional Platinum‐Group‐Metal Catalyst for Automotive Exhaust Catalysis
ChemCatChem ( IF 3.8 ) Pub Date : 2018-02-09 , DOI: 10.1002/cctc.201701706
Andrew J. Binder ₁ , Todd J. Toops ₁ , James E. Parks ₁

Affiliation

Recently, we reported on a ternary mixed‐oxide catalyst that showed low‐temperature CO oxidation activity under lean exhaust conditions without inhibition by hydrocarbons such as propene. However, the hydrocarbon oxidation activity of this Cu–Co–Ce (CCC) catalyst cannot be considered as a stand‐alone solution to low‐temperature automotive exhaust catalysis. To achieve both low‐temperature oxidation of pollutants and a reduction in the total platinum‐group‐metal (PGM) content, we examined a 50 % physical mixture of traditional Pt/Al₂O₃ and our CCC catalyst in two simulated exhaust protocols. Using this physical mixture, we were able to obtain equivalent or better hydrocarbon activity than the baseline Pt/Al₂O₃ catalyst with half the total PGM content as well as increased sulfur tolerance for the CCC component of the mixture. Diffuse reflectance infrared Fourier transform spectroscopy data confirmed that despite exposure of sulfur‐sensitive CCC to SO₂, Cu⁺‐carbonyl binding sites could still be seen if the catalyst was mixed with Pt/Al₂O₃.

中文翻译：

铜-钴-铈三元氧化物作为传统铂族金属催化剂用于汽车尾气催化的添加剂

最近，我们报道了一种三元混合氧化物催化剂，该催化剂在稀薄排气条件下表现出低温CO氧化活性，而不受诸如丙烯之类的碳氢化合物的抑制。但是，这种Cu-Co-Ce（CCC）催化剂的碳氢化合物氧化活性不能视为低温汽车尾气催化的独立解决方案。为了实现污染物的低温氧化和减少铂族金属总量（PGM），我们在两个模拟排气方案中检查了传统Pt / Al ₂ O ₃和CCC催化剂的50％物理混合物。使用这种物理混合物，我们可以获得比基线Pt / Al ₂ O ₃等效或更好的碳氢化合物活性。催化剂的总PGM含量为一半，并且对混合物的CCC成分具有更高的耐硫性。漫反射红外傅里叶变换光谱数据证实，尽管硫敏感的CCC暴露于SO ₂，但如果将催化剂与Pt / Al ₂ O ₃混合，仍可以看到Cu ⁺ -羰基结合位点。

更新日期：2018-02-09

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