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Three-dimensionally ordered macroporous CeO_2/Al_2O_3-supported Au nanoparticle catalysts: Effects of CeO_2 nanolayers on catalytic activity in soot oxidation

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Chinese Journal of Catalysis 2017年第9期38卷 1629-1641页

作者： Baofang Jin Yuechang Wei Zhen Zhao Jian Liu Yazhao Li Renjie Li Aijun Duan Guiyuan Jiang State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China Institute of Catalysis for Energy and Environment Shenyang Normal University Shenyang 110034 Liaoning China

A series of catalysts consisting of three‐dimensionally ordered macroporous(3DOM)x‐CeO2/Al2O3‐supported Au nanoparticles(x=2,10,20,and40wt%)were successfully synthesized using a reduction‐deposition *** catalysts were characterized using scanning electron microscopy,the Brunauer‐Emmett‐Teller method,X‐ray diffraction,transmission electron microscopy,ultraviolet‐visible spectroscopy,and temperature‐programmed reduction by *** nanoparticles of mean particle size5nm were well dispersed and supported on the inner walls of uniform ***3DOM structure improved the contact efficiency between soot and the *** Al‐Ce‐O solid solution was formed in the multilayer support,i.e.,x‐CeO2/Al2O3,by the incorporation of Al3+ions into the CeO2lattice,which resulted in the creation of extrinsic oxygen *** interactions between the metal(Au)and the support(Ce)increased the amount of active oxygen species,and this promoted soot *** catalytic performance in soot combustion was evaluated using a temperature‐programmed oxidation *** presence of CeO2nanolayers in the3DOM Au/x‐CeO2/Al2O3catalysts clearly improved the catalytic activities in soot *** the prepared catalysts,3DOM Au/20%CeO2/Al2O3showed high catalytic activity and stability in diesel soot oxidation.

关键词： Three‐dimensionally ordered macroporous material Gold nanoparticle Multilayer support CeO2 nanolayer Soot combustion

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Three-dimensional ordered macroporous perovskite-type La_(1-x)K_xNiO_3 catalysts with enhanced catalytic activity for soot combustion: the Effect of K-substitution

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Chinese Journal of Catalysis 2019年第5期40卷 722-732页

作者： Xuelei Mei Jing Xiong Yuechang Wei Chujun Wang Qiangqiang Wu Zhen Zhao Jian Liu State Key Laboratory of Heavy Oil Processing College of ScienceChina University of Petroleum-BeijingBeijing 102249China

Three-dimensional ordered macroporous (3DOM) La1?xKxNiO3 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, La0.95K0.05NiO3 exhibited the highest activity in soot combustion (with its T50 and CO2 S values being 338 °C 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 La1?xKxNiO3 nanocatalysts with 3DOM structure without noble metals have potential for practical applications in the catalytic combustion of diesel soot particles.

关键词： Three-dimensional ordered macroporous material LaNiO3 Potassium Perovskite Soot combustion

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