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Bimetallic AuPd@CeO2 Nanoparticles Supported on Potassium Titanate Nanobelts: A Highly Efficient Catalyst for the Reduction of NO with CO
Catalysis Letters ( IF 2.3 ) Pub Date : 2021-01-08 , DOI: 10.1007/s10562-020-03502-7
Xianwei Wang , Nobutaka Maeda , Daniel M. Meier , Alfons Baiker

A nanocomposite consisting of bimetallic AuPd nanoparticles, which were modified with CeO2 (AuPd@CeO2), and deposited on potassium titanate nanobelts (KTN) as support, is shown to exhibit outstanding catalytic performance in the selective catalytic reduction of NO with CO. Transmission electron microscopy and energy dispersive X-Ray elemental mapping indicated that the AuPd nanoparticles surrounded by CeO2 were well-mixed forming an alloy. The potassium titanate support consisted of 1–3 µm long and 8–14 nm wide nanobelts. The AuPd@CeO2/KTN catalyst showed full NO conversion at 100 % selectivity to N2 at a gas-hourly space velocity (GHSV) of 15,000 h−1 and 200 °C. The outstanding performance of the AuPd@CeO2/KNT catalyst is attributed to favorable synergies between its components. Corresponding monometallic Au catalysts supported on KTN (Au@CeO2/KNT), as well as bimetallic AuPd supported on TiO2 (AuPd@CeO2/TiO2), showed inferior catalytic performance, indicating the absence of a beneficial synergy between the different components. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with modulation excitation spectroscopy (MES) proved that alloying of Au with Pd enhances the ability to adsorb CO and NO on the surface in an on-top configuration and that the deposition of the bimetallic AuPd nanoparticles on KTN facilitates the crucial formation of isocyanate (-NCO) species, resulting in high conversion and selectivity.

中文翻译:

负载在钛酸钾纳米带上的双金属 AuPd@CeO2 纳米颗粒:一种用 CO 还原 NO 的高效催化剂

由双金属 AuPd 纳米粒子组成的纳米复合材料,用 CeO2 (AuPd@CeO2) 改性并沉积在钛酸钾纳米带 (KTN) 上作为载体,在用 CO 选择性催化还原 NO 方面表现出出色的催化性能。显微镜和能量色散 X 射线元素映射表明,被 CeO2 包围的 AuPd 纳米粒子混合良好,形成了合金。钛酸钾载体由 1-3 µm 长和 8-14 nm 宽的纳米带组成。AuPd@CeO2/KTN 催化剂在 15,000 h-1 和 200 °C 的气时空速 (GHSV) 下,以 100% 的选择性对 N2 进行了完全的 NO 转化。AuPd@CeO2/KNT 催化剂的优异性能归功于其组分之间的良好协同作用。相应的负载在 KTN 上的单金属 Au 催化剂(Au@CeO2/KNT)以及负载在 TiO2 上的双金属 AuPd(AuPd@CeO2/TiO2)表现出较差的催化性能,表明不同组分之间缺乏有益的协同作用。原位漫反射红外傅里叶变换光谱 (DRIFTS) 结合调制激发光谱 (MES) 证明,Au 与 Pd 的合金化增强了在顶部配置中吸附 CO 和 NO 的能力,并且双金属的沉积KTN 上的 AuPd 纳米粒子促进了异氰酸酯 (-NCO) 物质的关键形成,从而实现了高转化率和选择性。表明不同成分之间缺乏有益的协同作用。原位漫反射红外傅里叶变换光谱 (DRIFTS) 结合调制激发光谱 (MES) 证明,Au 与 Pd 的合金化增强了在顶部配置中吸附 CO 和 NO 的能力,并且双金属的沉积KTN 上的 AuPd 纳米粒子促进了异氰酸酯 (-NCO) 物质的关键形成,从而实现了高转化率和选择性。表明不同成分之间缺乏有益的协同作用。原位漫反射红外傅里叶变换光谱 (DRIFTS) 结合调制激发光谱 (MES) 证明,Au 与 Pd 的合金化增强了在顶部配置中吸附 CO 和 NO 的能力,并且双金属的沉积KTN 上的 AuPd 纳米粒子促进了异氰酸酯 (-NCO) 物质的关键形成,从而实现了高转化率和选择性。
更新日期:2021-01-08
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