Design and synthesis of model and practical palladium catalysts using atomic layer deposition
Design and synthesis of model and practical palladium catalysts using atomic layer deposition
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DOI：
10.1039/c6cy00682e
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发表时间：
2016-01-01
影响因子：
5
通讯作者：
Lei, Yu
中科院分区：
文献类型：
--
作者：
Lu, Zheng;Kizilkaya, Orhan;Lei, Yu
我们研究了原子层沉积法（ALD）一批合成模型和实际钯催化剂。在粘流条件下采用ALD法同时合成了两种模型催化剂和一种粉末基纳米催化剂。此外，Pd/TiO 2（110）模型催化剂通过相同的ALD工艺，但在超真空条件下制备。由于自限制的表面反应，定义ALD，所有的Pd催化剂的局部结构基本上是相同的，通过一套显微镜和光谱表征技术证实。通过应用表面科学探针和先进的同步加速器技术，并通过战略性地选择最适合每个表征的催化剂基底，实现了对Pd基催化剂的全面了解。X射线吸收光谱和X射线共振光电子能谱都表明，钯与TiO 2载体的相互作用很弱。ALD促进的一批合成方法可以潜在地弥合模型催化剂和实际催化剂之间的“合成差距”。
We investigated the "one-batch" synthesis of model and practical palladium catalysts using atomic layer deposition (ALD). Two types of model catalysts and one type of powder-based nanocatalyst were synthesized simultaneously by ALD under viscous flow conditions. In addition, Pd/TiO2(110) model catalysts were prepared by the identical ALD process but under ultrahigh vacuum conditions. Because of the self-limiting surface reaction that defines ALD, the local structure of all the Pd catalysts were essentially the same as confirmed by a suite of microscopic and spectroscopic characterization techniques. A comprehensive understanding of the Pd-based catalysts was achieved by applying both surface science probes and advanced synchrotron techniques, and by strategically selecting the catalyst substrate best suited for each characterization. Both X-ray absorption spectroscopy and X-ray resonant photoelectron spectroscopy suggested that Pd only weakly interacted with the TiO2 support. The one-batch synthesis approach facilitated by ALD can potentially bridge the "synthesis gap" between model catalysts and practical catalysts.