Complex structural dynamics of nanocatalysts revealed in Operando conditions by correlated imaging and spectroscopy probes.
Complex structural dynamics of nanocatalysts revealed in Operando conditions by correlated imaging and spectroscopy probes.
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DOI：
10.1038/ncomms8583
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发表时间：
2015-06-29
影响因子：
16.6
通讯作者：
Frenkel, A. I.
中科院分区：
文献类型：
--
作者：
Li, Y.;Zakharov, D.;Zhao, S.;Tappero, R.;Jung, U.;Elsen, A.;Baumann, Ph.;Nuzzo, R. G.;Stach, E. A.;Frenkel, A. I.
了解多相催化剂在化学反应过程中如何改变尺寸、形状和结构，受到缺乏在工作状态下（即在操作条件下）研究催化系集的方法的限制。在这里，通过同步加速器x射线吸收光谱和扫描透射电子显微镜在操作条件下的相关使用，我们定量地描述了在催化反应-乙烯加氢过程中表现出的负载Pt催化剂的复杂结构动力学。这项工作开发了一种与两种探针兼容的微制造催化反应器。结果表明，在不同的反应条件下，铂簇系综的动态转变跨越了广泛的尺寸范围。该方法可推广到使用各种x射线和电子基实验探针的复杂系统的定量操作研究。研究反应过程中的催化剂（operando条件）可以对催化剂所经历的变化提供重要的见解。在这里，作者使用operando方法将x射线光谱和基于电子的成像技术相关联，以测量乙烯催化加氢过程中Pt纳米颗粒的动态变化。
Understanding how heterogeneous catalysts change size, shape and structure during chemical reactions is limited by the paucity of methods for studying catalytic ensembles in working state, that is, in operando conditions. Here by a correlated use of synchrotron X-ray absorption spectroscopy and scanning transmission electron microscopy in operando conditions, we quantitatively describe the complex structural dynamics of supported Pt catalysts exhibited during an exemplary catalytic reaction—ethylene hydrogenation. This work exploits a microfabricated catalytic reactor compatible with both probes. The results demonstrate dynamic transformations of the ensemble of Pt clusters that spans a broad size range throughout changing reaction conditions. This method is generalizable to quantitative operando studies of complex systems using a wide variety of X-ray and electron-based experimental probes. Studying a catalyst during reaction (operando conditions) can give significant insights into the changes a catalyst undergoes. Here, the authors use an operando approach to correlate X-ray spectroscopy and electron based imaging techniques to measure the dynamic changes in Pt nanoparticles during the catalytic hydrogenation of ethylene.
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影响因子：
15
作者：
Li, Long;Wang, Lin-Lin;Yang, Judith C.
通讯作者：
Yang, Judith C.
影响因子：
41.2
作者：
Vendelbo, S. B.;Elkjaer, C. F.;Helveg, S.
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Helveg, S.
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作者：
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作者：
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