New effective catalysts based on mesoporous nanofibrous carbon for selective oxidation of hydrogen sulfide

The systems based on granular mesoporous nanofibrous carbonaceous (NFC) materials synthesized by decomposition of hydrocarbons over nickel-containing catalysts are promising catalysts for selective oxidation of hydrogen sulfide. Sample series of nanofibrous carbon with three main types of their fibe...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2009-01, Vol.85 (3-4), p.180-191
Main Authors: Shinkarev, V.V., Glushenkov, A.M., Kuvshinov, D.G., Kuvshinov, G.G.
Format: Article
Language:English
Subjects:
Carbon nanofiber
Carbon nanotube
Catalysis
Catalysts
Decomposition
Fibers
Hydrogen sulfide
Hydrogen sulfide selective oxidation
Metals
Nanostructure
nanotechnology
Oxidation
Oxygen
Oxygen excess
Q1
Sulfur
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Summary:The systems based on granular mesoporous nanofibrous carbonaceous (NFC) materials synthesized by decomposition of hydrocarbons over nickel-containing catalysts are promising catalysts for selective oxidation of hydrogen sulfide. Sample series of nanofibrous carbon with three main types of their fiber structures and different contents of metal catalysts inherited from the catalysts for their synthesis were studied in this reaction. The correlation between NFC structure and its activity and selectivity in hydrogen sulfide oxidation was determined. The metal inherited from the initial catalysts for the synthesis of NFC influences the activity and selectivity of the resulting carbon catalysts. A particular influence is observed in the case of the catalyst withdrawn from the synthesis reactor at the stage of stationary operation of the metal catalyst (low specific carbon yields per unit weight of the catalyst). The presence of the metal phase results in an increase in the carbon catalyst activity and in a decrease in the selectivity to sulfur. NFC samples with the highest activity and selectivity are nanotubes and those with graphite planes perpendicular to the axis of the fibers. Carbon nanotubes have high selectivity, while samples obtained on copper–nickel catalysts also possess high activity. The promising NFC catalysts provide high conversion and selectivity (almost independent of the molar oxygen/hydrogen sulfide ratio) when a large excess of oxygen is contained in the reaction mixture.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2008.07.011