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首页> 外文期刊>Catalysis science & technology >Nanoparticles-in-concavities as efficient nanocatalysts for carbon dioxide reforming of methane to hydrogen and syngas
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Nanoparticles-in-concavities as efficient nanocatalysts for carbon dioxide reforming of methane to hydrogen and syngas

机译：Nanoparticles-in-concavities一样有效nanocatalysts二氧化碳重整的甲烷氢气和合成气

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The synergy between ceria and loaded metal nanocrystals (NCs) greatly promotes the catalytic properties for many reactions. Nevertheless, the clear relevance of structures to properties in catalytic systems is hard to establish in that the catalysts studied either featured unstable microstructures or were too heterogeneous. Herein, we show both the facile tool of NC assembly to derive stable and efficient catalytic materials, in which the metal NCs are tailored in terms of their spatial positioning on the nanometer scale (i.e., entrapped in the internal concave ceria surface or deposited on the external convex ceria surface), and how to probe their structure-function relationship. The performance for producing renewable energy sources from hazardous greenhouse gases on a NCs-in-concavities structure is distinct from that on a NCs-on-convexities configuration, elucidating a pivotal impact by the spatial positioning. The current investigation suggests that there exists a clear relationship between the surface adsorbate bonding strength/type and the catalytic properties in reforming CO2/CH4 to hydrogen energy and syngas. Control over the bonding strength/type and activation mechanism of the adsorbates on the catalyst surfaces through changing the support surface curvature orientation is indicated to be a potential strategy for modulating the reaction activity. The insights focus on grasping the surface chemistry of the ceria surface curvature in optimizing the catalysts and can be enlightening for rationally exploring other state-of-the-art heterogeneous nanomaterials.
机译：二氧化铈和加载金属之间的协同作用纳米晶体(nc)大大促进了催化属性对许多反应。清晰的结构属性的相关性催化系统难以建立催化剂研究要么出现不稳定微观结构或太异类了。在此,我们显示数控的简单工具大会获得稳定、高效的催化材料,金属nc量身定做他们的空间定位纳米尺度(即裹入内部凹二氧化铈表面或沉积外部表面凸二氧化铈),以及如何调查他们的结构关系。生产可再生能源的性能从有害的温室气体来源NCs-in-concavities结构是不同的在NCs-on-convexities配置,阐明一个关键影响的空间定位。这之间存在着明确的关系表面吸附物粘接强度/类型和改革CO2 /甲烷的催化性能氢能源和合成气。粘接强度/类型和激活的机制催化剂表面上的吸附物改变表面曲率的支持定位是一个潜在的指示调制策略的反应活动。重点掌握表面的见解二氧化铈的化学表面曲率优化催化剂,可以启发理性地探索其他先进的异构的纳米材料。

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