Cai Sixiang, Zhang Dengsong, Shi Liyi, Xu Jing, Zhang Lei, Huang Lei, Li Hongrui, Zhang Jianping
Research Center of Nano Science and Technology, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Nanoscale. 2014 Jul 7;6(13):7346-53. doi: 10.1039/c4nr00475b.
In this work, we successfully in situ decorated nickel foam with porous Ni-Mn oxide nanosheets (3DH-NM/NF) as 3D hierarchical monolith de-NOx catalysts via a simple hydrothermal reaction and calcination process. The catalysts were carefully examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, elemental mapping, X-ray photoelectron spectroscopy, H2 temperature-programmed reduction and NH3 temperature-programmed desorption measurements. The results indicated that the nanosheets are composed of a Ni6Mn1O8 spinel and the metal species are uniformly dispersed in bi-metal oxides. As a result, the strong synergistic effects between the Mn and Ni species have been observed. The active oxygen species, reducible species and acidity are enhanced by the in situ formation of the nanosheets on the surface of nickel foam. These desirable features of 3DH-NM/NF catalysts bring about the excellent de-NOx performance. Moreover, the 3DH-NM/NF catalysts also present good stability and H2O resistance. Based on these favorable properties, 3DH-NM/NF could be considered as a promising candidate for the monolith de-NOx catalysts.
在本工作中，我们通过简单的水热反应和煅烧过程，成功地在泡沫镍上原位修饰了多孔Ni-Mn氧化物纳米片（3DH-NM/NF），作为三维分级整体式脱硝催化剂。通过X射线衍射、扫描电子显微镜、透射电子显微镜、元素映射、X射线光电子能谱、H2程序升温还原和NH3程序升温脱附测量等手段对催化剂进行了仔细研究。结果表明，纳米片由Ni6Mn1O8尖晶石组成，金属物种均匀分散在双金属氧化物中。因此，观察到Mn和Ni物种之间存在强烈的协同效应。泡沫镍表面原位形成的纳米片增强了活性氧物种、可还原物种和酸度。3DH-NM/NF催化剂的这些理想特性带来了优异的脱硝性能。此外，3DH-NM/NF催化剂还具有良好的稳定性和抗H2O性能。基于这些优良性能，3DH-NM/NF可被视为整体式脱硝催化剂的一个有前途的候选者。
