催化作用
水煤气变换反应
镍
非阻塞I/O
吸附
惰性
金属
化学工程
氧化物
材料科学
过渡金属
惰性气体
氧化镍
无机化学
化学
物理化学
冶金
有机化学
复合材料
工程类
作者
Ning Liu,Bili Chen,Kunlong Liu,Ruixuan Qin,Jingjuan Wang,Yazhou Zhang,Qinghua Zhang,Lin Gu,Pengxin Liu,Kecheng Cao,Pu Yan,Gang Fu,Nanfeng Zheng
标识
DOI:10.1021/acscatal.3c00388
摘要
Silica is commonly considered an inert support, and limited research has been concentrated on its role in constructing active metal–(hydr)oxide interfaces. Herein, we found that modifying the surface of nickel with silica will significantly promote its catalytic performance toward the water–gas shift reaction (WGSR), and the well-fabricated Ninp@PS(H450) exhibits a WGSR rate of up to 725 ± 7 μmolCO gcat–1 s–1 at 350 °C, which is at the highest level compared with previously reported Ni-based catalysts. Combining the experiment and theory, we demonstrated that Niδ+–O–SiOx interfaces divide the Ni surface into small domains consisting of contiguous Ni atoms. With the aid of an ensemble effect, the adsorption energies of CO, OH, and H can be tuned into appropriate ranges. Moreover, the Niδ+–O–SiOx interfaces also inhibit the formation of a dense NiO (or Ni(OH)2) layer, thus endowing the catalyst with high stability. This study offers valuable insights into the catalytic mechanism linking Ni and silica, which can aid in the development of high-performance Ni-based catalysts.
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