The selective influence of sulfur on the performance of novel cobalt-based water-gas shift catalysts

Novel Co MnO and CoCr 2O 4 catalysts were found to be tolerant to sulfur up to levels of 220 ppm under WGS reaction conditions. However in coal-derived process gas containing between 0.25 and 0.3 mol% sulfur, and at a reaction temperature of 400°C the Co MnO catalyst deactivated rapidly and irrevers...

Full description

Saved in:
Bibliographic Details
Published in:Applied catalysis. A, General General, 1997-12, Vol.164 (1), p.69-79
Main Authors: Mellor, J.R., Copperthwaite, R.G., Coville, N.J.
Format: Article
Language:English
Subjects:
Cobalt catalyst
Spinel
Sulfur poisoning
Water-gas shift reaction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Novel Co MnO and CoCr 2O 4 catalysts were found to be tolerant to sulfur up to levels of 220 ppm under WGS reaction conditions. However in coal-derived process gas containing between 0.25 and 0.3 mol% sulfur, and at a reaction temperature of 400°C the Co MnO catalyst deactivated rapidly and irreversibly with formation of bulk Co 9S 8 and a surface manganese sulfide species. The CoCr 2O 4 catalyst partially deactivated under similar conditions, a phenomenon related to the formation of a surface sulfate species. Bulk sulfiding of the CoCr 2O 4 catalyst to CoCr 2S 4 occurred at 550°C and this catalyst gave near-equilibrium CO conversions in the WGS reaction. A pre-sulfided cobalt chromium catalyst demonstrated typical sulfur dependent mechanistic characteristics, with a maximum activity above 400°C.
ISSN:0926-860X
1873-3875
DOI:10.1016/S0926-860X(97)00158-0