1. Iron and Copper Nanoparticles Inside and Outside Carbon Nanotubes: Nanoconfinement, Migration, Interaction and Catalytic Performance in Fischer-Tropsch Synthesis
- Author
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Ahmed Addad, Jingping Hong, Yuliia Kosto, Břetislav Šmíd, Gang Ji, Ana Katiuce Fellenberg, Andrei Y. Khodakov, Pardis Simon, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, Unité Matériaux et Transformations - UMR 8207 (UMET), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centrale Lille Institut (CLIL), Kyung Hee University (KHU), Charles University [Prague] (CU), Université de Lille, CNRS, INRA, ENSCL, Unité Matériaux et Transformations - UMR 8207 [UMET], Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181, Unité Matériaux et Transformations (UMET) - UMR 8207, Central South University [Changsha], Charles University [Prague] [CU], Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)
- Subjects
NAP-XPS ,chemistry.chemical_element ,02 engineering and technology ,Carbon nanotube ,010402 general chemistry ,7. Clean energy ,01 natural sciences ,Catalysis ,Fischer-Tropsch ,law.invention ,chemistry.chemical_compound ,law ,[CHIM]Chemical Sciences ,Physical and Theoretical Chemistry ,Bimetallic strip ,nanoconfinement ,iron carbide ,Fischer–Tropsch process ,promotion ,syngas ,021001 nanoscience & nanotechnology ,Copper ,mobility ,0104 chemical sciences ,chemistry ,Chemical engineering ,copper ,0210 nano-technology ,Carbon ,Syngas ,Carbon monoxide - Abstract
International audience; Carbon materials have attracted increasing attention as supports for metal catalysts. Ironcontaining carbon nanotubes often promoted with copper have found application in Fischer-Tropsch synthesis, which provides an alternative way for conversion of renewable feedstocks to chemicals and fuels. In carbon nanotubes, the active phase can be nanoconfined inside the channels or localized on the outer surface. In most of previous work, the distribution of metal nanoparticles inside or outside carbon nanotubes is considered to be immobile during the catalyst activation or catalytic reaction. In this paper, we uncovered remarkable mobility of both iron and copper species in the bimetallic catalysts between inner carbon nanotube channels and outer surface, which occurs in carbon monoxide and syngas, while almost no migration of iron species proceeds in the monometallic catalysts. This mobility is enhanced by noticeable fragility and defects in carbon nanotubes, which appear on their impregnation with the acid solutions of metal precursors and precursor decomposition. Remarkable mobility of iron and copper species in bimetallic catalysts affects the genesis of iron active sites, and enhances interaction of iron with the promoter. In the bimetallic iron-copper catalysts, the major increase in the activity was attributed to higher reaction turnover frequency over iron surface sites located in a close proximity with copper.
- Published
- 2021
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