fulltext.study @t Gmail

Nature and reactivity of the surface species observed over a supported cobalt catalyst under CO/H2 mixtures

Paper ID Volume ID Publish Year Pages File Format Full-Text
53832 46986 2015 6 PDF Available
Title
Nature and reactivity of the surface species observed over a supported cobalt catalyst under CO/H2 mixtures
Abstract

•A supported cobalt catalyst was investigated by operando FT-IR under CO/H2.•Cobalt-bound carbonyls were adsorbed on a surface exhibiting a metallic character.•Surface formates surprisingly exhibited a two-fold reactivity.

The nature and reactivity of the surface species present at the surface of a Co-supported sample were investigated by in situ and operando DRIFTS. The operando DRIFTS data collected over a 15% Co/Siralox® showed that the state of the surface was typically carbon-poor under our operating conditions, i.e. the nature of the surface was metallic rather than carbidic. A significant modification of the cobalt surface was observed with time on stream. An accumulation of waxes was also noted at the catalyst surface, despite the fact that the reaction was performed at ambient pressure. Chemical transient experiments carried out by removing CO from the feed indicated that the various types of CO(ads) present (e.g. linear and bridged) displayed an apparent uniform reactivity. In contrast, two types of formates reactivity were observed, while the IR spectra of these formate species were undistinguishable. The faster reacting formates, possibly adsorbed at the interface of Co and the support or directly on an oxidic phase of cobalt, could potentially be an intermediate in the formation of the methanol side-product observed under our reaction conditions.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (111 K)Download as PowerPoint slide

Keywords
Syngas; Cobalt; Fischer–Tropsch synthesis; Methanol; Formate; DRIFTS
First Page Preview
Nature and reactivity of the surface species observed over a supported cobalt catalyst under CO/H2 mixtures
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 242, Part A, 15 March 2015, Pages 178–183
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