Abstract
The effects of potassium on the catalytic behavior in CO hydrogenation over K-promoted Fe/carbon catalysts having low K/Fe ratios were investigated. Even though the doses of potassium were low the promotional effects were pronounced, especially on the olefin-to-paraffin ratio, and theC 3 toC 4 olefin selectivities of the K-promoted catalysts were as high as 51 to 66 mol%. Over the catalysts having no or low potassium content the olefin-to-paraffin ratio and the ratio of the CO2 formation rate to the rate of CO conversion to hydrocarbons remained roughly the same regardless of temperature, while over the K-promoted catalysts having higher potassium content they increased with temperature. Formation of significant amounts of filamentous carbon was observed in the K-promoted catalysts; however, the carbon deposition did not appear to affect the inherent activity and selectivity of the K-promoted catalysts.
Article PDF
Similar content being viewed by others
Explore related subjects
Discover the latest articles, news and stories from top researchers in related subjects.Avoid common mistakes on your manuscript.
References
Ameise, J. A., Schwartz, L. H. and Butt, J. B., “Iron Alloy Fischer-Tropsch Catalysts. III. Conversion Dependence of Selectivity and Water-Gas Shift”,J. Catal,72, 95 (1981).
Anderson, R. B., “Catalysis”, Vol.4, p.119, Emmett, P. H., ed.. Reinhold, New York, 1956.
Anderson, R. B., “The Fischer-Tropsch Synthesis”, Chaps. 3, 4 and 5, Academic Press, Orlando, 1984.
Bartholomew, C. H., “Carbon Deposition in Steam Reforming and Methanation”,Cat. Rev.-Sci. Eng.,24, 67 (1982).
Boudart, M., Delbouille, A., Dumesic, J. A., Khammouma, S. and TopsΦe, H., “Surface, Catalytic and Magnetic Properties of Small Iron Particles. Part I. Preparation and Characterization of Samples”,J. Catal.,37, 486 (1975).
Chen, A. A., Vannice, M. A. and Phillips, J., “Effect of Support Pretreatments on Carbon-Supported Fe Particles”,J. Phys, Chem.,91, 6257 (1987).
Chen, A. A., Phillips, J., Venter, J. J. and Vannice, M. A., “The Genesis of C-Supported Fe-Mn and K-Fe-Mn Catalysts from Stoichiometric Metal Carbonyl Clusters. II. Characterization by Mössbauer Spectroscopy and STEM/EDS”,J. Catal.,118, 443 (1989).
Dry, M. E., “The Fischer-Tropsch Synthesis”, in “Catalysis: Science and Technology”, Vol. 1, Chap. 4, Anderson, J.R and Boudart, M., eds.. Springer, Berlin, 1981.
Emmett, P. H. and Brunauer, S., “Accumulation of Alkali Promoters on Surfaces of Iron Synthetic Ammonia Catalysts”,J. Amer. Chem. Soc.,59 310 (1937).
Jung, H. J., Walker, P. L., Jr. and Vannice, M. A., “CO Hydrogenation over Well-Dispersed Carbon-Supported Catalysts”,J. Catal.,75, 416 (1982).
Kaminsky, M., Yoon, K. J., Geoffroy, G. L. and Vannce, M. A., *Carbon-Supported Fe-Ru Catalysts Prepared from Stoichiometric Mixed-Metal Carbonyl Clusters”,J. Catal. 91, 338 (1985).
Martín-Martínez, J. M. and Vannice, M. A., “Carbon-supported Iron Catalysts: Influence of Support Porosity and Preparation Techniques on Crystallite Size and Catalytic Behavior”,Ind. Eng. Chem. Res.,30, 2263 (1991).
McVicker, G. B. and Vannice, M. A., “The Preparation, Characterization, and Use of Supported Potassium-Group VIII Metal Complexes as Catalysts for CO Hydrogenation”,J.Catal.,63, 25 (1980).
Ott, G. L., Fleisch, T. and Delgass, W. N., “Carbon Deposition and Activity Changes over Fe-Ru Alloys during Fischer-Tropsch Synthesis”,J. Catal.,65, 253 (1980).
Phillips, J., Clausen, B. and Dumesic, J. A., “Iron Pentacarbonyl Decomposition over Grafoil. Production of Small Metallic Iron Particles”,J. Phys. Chem.,84, 1814 (1980).
Raupp, G. B. and Delgass, W. N., “Mössbauer Investigation of Supported Fe Catalysts. III. In Situ Kinetics and Spectroscopy during Fischer-Tropsch Synthesis”,J. Catal.,58, 361 (1979).
Rostrup-Neilson, J. and Trimm, D. L., “Mechanisms of Carbon Formation on Nickel-Containing Catalysts”.J. Catal.,48, 155 (1977).
Sachtler, W. M. H., Shriver, D. F., Hollenberg, W. B. and Lang, A. F., “Promoter Action in Fischer-Tropsch Catalysis”,J. Catal. 92, 429 (1985).
Satterfield, C. N. “Heterogeneous Catalysis in Practice”, p.142, McGraw-Hill, New York, 1980.
Storch, H. H., Golumbic, H. and Anderson, R. B., “The Fischer-Tropsch and Related Syntheses”, p. 234. Wiley, New York, 1951.
Stork, W. H. J. and Pott, G. T., “Studies of Compound Formation on Alkali/γ-Aluminum Oxide Catalyst Systems Using Chromium, Iron and Manganese Luminiscence”,J. Phys. Chem.,78, 2496 (1974).
Vannice, M. A., “The Catalytic Synthesis of Hydrocarbons from H2/CO Mixtures over the Group VIII Metals”,J. Catal.,37, 449 (1975).
Vannice, M. A., “The Catalytic Synthesis of Hydrocarbons from Carbon Monoxide and Hydrogen”,Cat. Rev.-Sci. Eng.,14, 153 (1976).
Vannice, M. A., “The Catalytic Synthesis of Hydrocarbons from H2/CO Mixtures over the Group VIII Metals. V. The Catalytic Behavior of Silica-Supported Metals”,J. Catal.,50, 228 (1977).
Vannice, M. A., “Titania-Supported Metals as CO Hydrogenation Catalysts”,J. Catal.,74, 199 (1982).
Venter, J., Kaminsky, M., Geoffroy, G. L. and Vannice, M. A., “Carbon-Supported Fe-Mn and K-Mn-Fe Clusters for the Synthesis of C2-C4 Olefins from CO andH 2, J. Catal.,103, 450 (1987).
Venter, J. J., Chen, A. and Vannice, M. A., “The Genesis of C-Supported Fe-Mn and K-Fe-Mn Catalysts from Stoichiometric Metal Carbonyl Clusters. I. Characterization by DRIFTS”,J. Catal.,117, 170 (1989a).
Venter, J. J., Chen, A. A., Phillips, J. and Vannice, M. A., “The Genesis of C-Supported Fe-Mn and K-Fe-Mn Catalysts from Stoichiometric Metal Carbonyl Clusters. III. Characterization by Chemisorption, Calorimetry and Kinetic Analysis”,J. Catal.,119, 451 (1989b).
Weisz, P. B., “Diffusivity of Porous Particles. I. Measurements and Significance for Internal Reaction Velocities”,Z. Phys. Chem.,11, 1 (1957).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Yoon, K.J., Kim, E.J. CO hydrogenation over potassium-promoted Fe/carbon catalysts. Korean J. Chem. Eng. 12, 221–227 (1995). https://doi.org/10.1007/BF02705650
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02705650