NDLI: The oxidizing pretreatment-mediated autoreduction behaviour of cobalt nanoparticles supported on ordered mesoporous carbon for Fischer

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Catalysis Science & Technology Vol - 4 Issue - 2

Catalysis Science & Technology Vol -3

Catalysis Science & Technology Vol -2

Catalysis Science & Technology Vol -1

The oxidizing pretreatment-mediated autoreduction behaviour of cobalt nanoparticles supported on ordered mesoporous carbon for Fischer–Tropsch synthesis

Content Provider	Royal Society of Chemistry (RSC)
Author	Hou, Bo Jia, Litao Sun, Yuhan Li, Debao Wang, Jungang Yang, Yifei
Copyright Year	2014
Abstract	Ordered mesoporous carbons (OMCs) were employed to support cobalt species for insight into the autoreduction behaviour of cobalt oxide on carbon substrates and their catalytic performance during the Fischer–Tropsch synthesis (FTS). The as-synthesized samples were subjected to the characterization of N2-physisorption, XPS, in situ XRD, TPR, TG-MS, HAADF-STEM and H2-chemisorption. The results show that the oxidizing pretreatment of OMC substantially improves the dispersion of cobalt species. Consequently, more uniform cobalt particles are observed on the pretreated supports in comparison with their counterparts on pristine OMCs, which enables the autoreduction of cobalt oxide on the carbon supports to occur at a lower temperature owing to the weak metal–support interaction. As compared to the hydrogen-reduced samples, the morphology of cobalt particles suffers from a significant change after the autoreduction and a mechanism with respect to the anti-oriented diffusion of oxygen atoms is proposed to account for the formation of ellipsoidal or quasi-ellipsoidal particles. During the evaluation of FTS, the autoreduced catalysts exhibit higher activity than the hydrogen-reduced ones owing to more cobalt atoms being exposed on the surface. Dictated by the decreasing cobalt particles, the cobalt-specific activity of pretreated samples is ca. 2.2 times higher than its analog on the pristine OMCs under optimum conditions without any influence on the TOF or at the expense of the C5+ hydrocarbon selectivity.
Starting Page	717
Ending Page	728
Page Count	12
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	3
Journal	Catalysis Science & Technology
DOI	10.1039/c3cy00729d
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Cobalt oxide Chemisorption Oxygen OMC Hydrocarbon Fischer Fischer\u2013Tropsch process Cobalt Carbon Physisorption London dispersion force X-ray crystallography Mesoporous material TPR Diffusion
Content Type	Text
Resource Type	Article
Subject	Catalysis

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