Sinter-resistant and high-efficient Pt/CeO2/NiAl2O4/Al2O3@SiO2 model catalysts with “composite energy traps”  

作　　者：Jingwei Li Kai Li Liwei Sun Zeshu Zhang Zhijian Wu Yibo Zhang Xiangguang Yang 

机构地区：[1]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [2]Institute of Carbon Materials Science,Shanxi Datong University,Datong 037009,China [3]Jilin Provincial Key Laboratory of Green Chemistry and Process,Changchun Institute of Applied Chemistry,Changchun 130022,China

出　　处：《Science China Chemistry》2020年第4期519-525,共7页中国科学（化学英文版）

基　　金：the National Key Research and Development Program of China(2016YFC0204301);the National Natural Science Foundation of China(21872133,21273221);Youth Innovation Promotion Association of Chinese Academy of Sciences(2018263)。

摘　　要：The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO2/NiAl2O4/Al2O3@SiO2. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of "energy traps" which can also be applied to other supported catalysts.The stability of nanosized catalysts at high temperature is still a challenging topic and is a crucial criterion to evaluate their suitability for industrial use. Currently, the strategy to improve the high-temperature stability of nano-sized catalysts is to restrict the migration of particles on the surface, which, however, lacks theoretical knowledge and directions. Herein, we reported a new approach that can effectively inhibit the migration and agglomeration of supported nanoparticles by fabrication of a model catalyst Pt/CeO2/NiAl2O4/Al2O3@SiO2. This catalyst is highly stable with the microstructure unchanged even after being aged at 1000 °C. Density functional theory calculations indicate that two types of confinement effects exist in the catalyst and their mechanisms were well explained from the viewpoint of "energy traps" which can also be applied to other supported catalysts.

关 键 词：stability of NANOSIZED catalysts the migration and AGGLOMERATION of supported nanoparticles ENERGY trap two types of CONFINEMENT effects 

分 类 号：O643.36[理学—物理化学] TB383.1[理学—化学]