Operando Electron Microscopy Study of Cobalt-based Fischer-Tropsch Nanocatalysts

被引:8
|
作者
Dembele, Kassioge [1 ,2 ]
Bahri, Mounib [1 ]
Hirlimann, Charles [1 ]
Moldovan, Simona [1 ]
Berliet, Adrien [2 ]
Maury, Sylvie [2 ]
Gay, Anne-Sophie [2 ]
Ersen, Ovidiu [1 ,3 ]
机构
[1] Univ Strasbourg, UMR 7504 CNRS, Inst Phys & Chim Mat Strasbourg IPCMS, 23 Rue Loess,BP 43, F-67034 Strasbourg 2, France
[2] IFP Energies Nouvelles, Rond Point Echangeur Solaize, F-69360 Solaize, France
[3] Inst Univ France IUF, 1 Rue Descartes, F-75231 Paris, France
关键词
in  situ TEM; cobalt-based catalysts; reduction; syngas conversion; Fischer-Tropsch synthesis; operando study; PARTICLE-SIZE; CO; REDUCTION; SUPPORT; CATALYSTS; BEHAVIOR; NANOPARTICLES; HYDROCARBONS; DISPERSION;
D O I
10.1002/cctc.202001074
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Thanks to their stability and selectivity for long-chains hydrocarbons, supported Co nanoparticles are the most commonly used catalysts in the Fischer-Tropsch synthesis reaction. We report here on the use of in situ transmission electron microscopy (TEM) to address the real-time evolution of cobalt-based catalysts during their reduction under relevant industrial activation condition (10(5) Pa, 430 degrees C), and their operation in syngas (H-2/CO=2, 10(5) Pa, 220 degrees C). To do so, we chose Co3O4-Pt nanoparticles supported on silica or alumina that can be directly compared to some industrial catalysts. By analysing the real space information contained in the TEM images, we have monitored the fragmentation of cobalt aggregates, the disappearance of cavities within the particles, their shape changes, the particle diffusion and coalescence processes, as well as the effect of the support (silica or alumina) on the behaviour of the Co phase. An easier reduction of cobalt catalysts supported on silica as compared to the same catalyst supported on alumina was also observed. During the catalyst operation under syngas, we have noticed the stability of the general shape of the particles. Simultaneously, using a residual gas analyser connected to the TEM holder, the main gas products of the Fischer-Tropsch reaction were systematically analysed. Our findings underline the benefit of the operando TEM to study the dynamical evolution of catalysts, at the nanoparticle level, under operation conditions.
引用
收藏
页码:1920 / 1930
页数:11
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