Citation: Xuelei Mei, Jing Xiong, Yuechang Wei, Chujun Wang, Qiangqiang Wu, Zhen Zhao, Jian Liu. Three-dimensional ordered macroporous perovskite-type La_1-xK_xNiO₃ catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution[J]. Chinese Journal of Catalysis, ;2019, 40(5): 722-732. doi: 10.1016/S1872-2067(18)63269-9 shu

Three-dimensional ordered macroporous perovskite-type La_1-xK_xNiO₃ catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution

State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing 102249, China

Received Date: 23 October 2018
Revised Date: 21 November 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21673142), National Engineering Laboratory for Mobile Source Emission Control Technology (NELMS2017A05), PetroChina Innovation Foundation (2018D-5007-0505), and Science Foundation of China University of Petroleum, Beijing (242017QNXZ02, 2462018BJC005).

Three-dimensional ordered macroporous (3DOM) La_1-xK_xNiO₃ perovskite-type catalysts were successfully prepared by a colloidal crystal template method and characterized by scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray scattering elemental mapping, X-ray diffraction, Raman and X-ray photoelectron spectroscopy, and temperature-programmed reduction of H₂. Further, their catalytic activity in soot combustion was determined by temperature-programmed oxidation reaction. K substitution into the LaNiO₃ lattice led to remarkably improved catalytic activity of this catalyst in soot combustion. Amongst various catalysts, La_0.95K_0.05NiO₃ exhibited the highest activity in soot combustion (with its T₅₀ and S_CO₂ values being 338℃ and 98.2%, respectively), which is comparable to the catalytic activities of Pt-based catalysts under the condition of poor contact between the soot and the catalyst. K-substitution improves the valence state of Ni and increases the number of oxygen vacancies, thereby leading to increased density of surface-active oxygen species. The active oxygen species play a vital role in catalyzing the elimination of soot. The perovskite-type La_1-xK_xNiO₃ nanocatalysts with 3DOM structure without noble metals have potential for practical applications in the catalytic combustion of diesel soot particles.
- Three-dimensional ordered,
- macroporous material,
- LaNiO₃ Potassium,
- Perovskite,
- Soot combustion
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Three-dimensional ordered macroporous perovskite-type La1-xKxNiO3 catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution

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通讯作者: 陈斌, bchen63@163.com

Three-dimensional ordered macroporous perovskite-type La_1-xK_xNiO₃ catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution