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A highly efficient potassium-treated Au–Cu/Al2O3 catalyst for the preferential oxidation of carbon monoxide

机译：一种高效的钾处理的Au-Cu / Al 2 O 3催化剂，用于优先氧化一氧化碳

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At the operating temperature (80–120 °C) of a proton exchange membrane fuel cell (PEMFC), high-efficiency elimination of CO while minimizing the H _(2) consumption processes is highly desired but still remains a challenge. In the present manuscript, one novel potassium-treated Au–Cu/Al _(2) O _(3) catalyst was synthesized via a two step deposition–precipitation (DP) method with excellent catalytic performance for preferential oxidation of CO (CO-PROX) in a H _(2) -rich stream. This catalyst exhibits 100% CO conversion over a wide temperature window of 60–110 °C and ≥50% selectivity of CO _(2) under the PEMFC operating temperature. Furthermore, the as-prepared potassium-treated Au–Cu/Al _(2) O _(3) catalysts were also characterized by N _(2) adsorption analysis, scanning transmission electron microscopy (STEM)-energy dispersive X-ray spectroscopy (EDX), and in situ diffuse reflectance infrared Fourier transform spectroscopy ( in situ DRIFTS), and the reasons for enhanced catalytic activity of the potassium-treated sample were elucidated. The introduction of copper could strengthen the CO adsorption on the Au–Cu/Al _(2) O _(3) catalyst and potassium treatment could significantly increase the stability of active Cu ~(+) species that contribute to enhanced catalytic performance.
机译：在质子交换膜燃料电池（PEMFC）的工作温度（80-120°C），非常需要的高效消除CO的速度，同时最小化H _（2）消耗过程，但仍然仍然是一个挑战。在本发明的原稿中，通过两步沉淀沉淀（DP）方法合成一种新型钾处理的Au-Cu / Al _（2）O o〜（3）催化剂，其具有优先氧化CO的优先氧化（CO-）的催化性能prox）在h _（2） - rich流中。该催化剂在PEMFC工作温度下在60-110℃和≥50％选择性的宽温度窗口上表现出100％CO转化率。此外，通过N _（2）吸附分析，扫描透射电子显微镜（Stem）分散X射线光谱，其特征在于，所制备的钾处理的Au-Cu / Al _（2）O _（3）催化剂的特征在于，扫描透射电子显微镜（干）分散X射线光谱（EDX），并且原位漫反射率红外傅里叶变换光谱（原位漂移），阐明了增强钾处理样品的催化活性的原因。铜的引入可以加强Au-Cu / Al _（2）O o _（3）催化剂和钾处理的Co吸附可以显着提高有助于增强催化性能的活性Cu〜（+）物种的稳定性。

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