fulltext.study @t Gmail

How does activation affect the cobalt crystallographic structure? An in situ XRD and magnetic study

Paper ID Volume ID Publish Year Pages File Format Full-Text
54614 47017 2013 6 PDF Available
Title
How does activation affect the cobalt crystallographic structure? An in situ XRD and magnetic study
Abstract

•Different activation procedures have been applied to support Co catalysts.•Cobalt phase evolution has been followed by in situ XRD and magnetic measurements.•Reduction degree and crystallographic orientation depend on particle size & support.•Carbidisation–decarbidisation leads to mainly hexagonal closed packed cobalt.

Fischer–Tropsch synthesis uses cobalt catalysts to convert syngas into linear hydrocarbons. Activation is the key step generating and impacting the active phase and more precisely the crystallographic structure of the metallic cobalt particles. This study investigates the selective crystallographic orientation of cobalt-supported catalysts and its impact on the degree of reduction. Three catalysts supported on alumina and silica with various particle sizes were prepared and characterized by ex situ techniques. They underwent two kinds of reduction processes carried out under different atmospheres. A carbidisation–decarbidisation cycle was also performed on reduced catalysts. The evolution of the active phase under reactive conditions was followed by in situ X-Ray Diffraction and magnetic measurements. The different reduction processes gave rise to the formation of metallic cobalt with mainly a face-centered cubic structure. The degree of reduction was also affected by the type of reduction process. Carbidisation–decarbidisation had no global impact on the reduction extent and allowed the formation of mainly hexagonal closed packed metallic cobalt.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (120 K)Download as PowerPoint slide

Keywords
Co catalysts; Fischer–Tropsch; Carbidisation; Face-centered cubic; Hexagonal closed packed; Degree of reduction
First Page Preview
How does activation affect the cobalt crystallographic structure? An in situ XRD and magnetic study
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 215, 15 October 2013, Pages 18–23
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us