The effect of sulfur on supported cobalt Fischer–Tropsch catalysts

• Published in: Catalysis today Vol. 49; no. 1; pp. 33 - 40
• Main Authors: Curtis, V., Nicolaides, C.P., Coville, N.J., Hildebrandt, D., Glasser, D.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 1999; Elsevier Science
• Subjects: Catalysis; Catalysts: preparations and properties; Chemistry; Exact sciences and technology; Fischer–Tropsch; General and physical chemistry; IR spectra of adsorbed CO; SiO 2; Supported catalysts; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; TiO 2; TPR; Supported catalysts; Fischer–Tropsch; IR spectra of adsorbed CO; TPR; SiO 2; Co; TiO 2; Infrared spectrometry; Adsorption; Fischer Tropsch catalyst; Carbon monoxide; Experimental study; Titanium oxide; Cobalt; Silica; Supported catalyst
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/S0920-5861(98)00405-2

TiO
2- and SiO
2-supported, 10% by mass cobalt Fischer–Tropsch (F–T) catalysts, loaded with low concentrations of sulfur (100–2000
ppm) from different sources ((NH
4)
2S, (NH
4)
2SO
4, and (NH
4)
2SO
3), have been synthesized and characterized using DRIFTS and TPR. CO adsorption and F–T reaction, monitored by DRIFTS, revealed that small amounts of sulfur (100
ppm) increased the strength of most types of metal–CO interactions and enhanced F–T catalyst activity, as reflected by more intense metal–CH
x
infrared intensities relative to the unsulfided catalyst. Sulfur concentrations between 200 and 2000
ppm gave infrared spectra with decreased intensity of the absorbance peaks due to adsorbed hydrocarbons. It was found that the presence of sulfur resulted in a slight increase in the reduction temperature of the titania-supported catalysts. Sulfur on the surface of the silica supported catalysts decreased the intensity of the TPR peak related to a reducible silicate.