A Supported Nickel Catalyst Stabilized by a Surface Digging Effect for Efficient Methane Oxidation. (18th November 2019)

• Record Type: Journal Article
• Authors: Zhou, Huang; Liu, Tianyang; Zhao, Xuyan; Zhao, Yafei; Lv, Hongwei; Fang, Shi; Wang, Xiaoqian; Zhou, Fangyao; Xu, Qian; Xu, Jie; Xiong, Can; Xue, Zhenggang; Wang, Kai; Cheong, Weng‐Chon; Xi, Wei; Gu, Lin; Yao, Tao; Wei, Shiqiang; Hong, Xun; Luo, Jun; Li, Yafei; Wu, Yuen
• Is Part Of: Angewandte Chemie. Volume 131:Number 51(2019)
• Page Start: 18559
• Page End: 18564
• Publication Date: 2019-11-18
• Subjects: Eingrabungseffekt -- Metalldefektzentren -- Methanoxidation -- Nickel -- Thermodynamische Stabilität; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201912785
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A surface digging effect of supported Ni NPs on an amorphous N‐doped carbon is described, during which the surface‐loaded Ni NPs would etch and sink into the underneath carbon support to prevent sintering. This process is driven by the strong coordination interaction between the surface Ni atoms and N‐rich defects. In the aim of activation of C−H bonds for methane oxidation, those sinking Ni NPs could be further transformed into thermodynamically stable and active metal‐defect sites within the as‐generated surface holes by simply elevating the temperature. In situ transmission electron microscopy images reveal the sunk Ni NPs dig themselves adaptive surface holes, which would largely prevent the migration of Ni NPs without weakening their accessibility. The reported two‐step strategy opens up a new route to manufacture sintering‐resistant supported metal catalysts without degrading their catalytic efficiency. Abstract : Flucht nach innen : Nickel‐Nanopartikel (Ni‐NPs) auf der Oberfläche von amorphem, N‐dotiertem Kohlenstoff graben sich quasi in diesen ein, indem sie den Träger ätzen und in ihn einsinken, um Sintern zu vermeiden. Die einsinkenden Ni‐NPs lassen sich durch einfache Temperaturerhöhung in thermodynamisch stabile, aktive Metalldefektzentren zur Aktivierung von C‐H‐Bindungen für die Methanoxidation überführen. PDA=Polydopamin.