In-Situ Reduction of Promoted Cobalt Oxide Supported on Alumina by Environmental Transmission Electron Microscopy | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

1739855

Reference Type

Journal Article

Title

In-Situ Reduction of Promoted Cobalt Oxide Supported on Alumina by Environmental Transmission Electron Microscopy

Author(s)

Dehghan, R; Hansen, TW; Wagner, JB; Holmen, A; Rytter, E; Borg, O; Walmsley, JC

Year

2011

Is Peer Reviewed?

Yes

Journal

Catalysis Letters
ISSN: 1011-372X
EISSN: 1572-879X

Volume

141

Issue

Page Numbers

754-761

DOI

10.1007/s10562-011-0600-8

Web of Science Id

WOS:000290815800002

Abstract

Reduction of 12wt.%Co/0.5wt.%Re/alpha-Al(2)O(3) Fischer-Tropsch catalyst has been studied in-situ in an environmental transmission electron microscope. Reduction of Co(3)O(4) to metallic cobalt was observed dynamically at 360 A degrees C under 3.4 mbar H(2). Structural and morphological changes were observed by high resolution transmission electron microscopy and scanning transmission electron microscopy imaging. The cobalt particles were mainly face centred cubic while some hexagonal close packed particles were also found. Reoxidation of the sample upon cooling to room temperature, still under flowing H(2), underlines the reactivity of the nanoparticles and the importance of controlling the gas composition and specimen temperature during this type of experiment. Similar behaviour was observed for a non-promoted catalyst. Imaging and analysis of the promoted sample before and after reduction indicated a uniform distribution of the promoter.

Keywords

Environmental transmission electron microscopy; Fischer-Tropsch; In-situ; Reduction; Cobalt