Effect of preadsorbed sulfur compounds on chemisorption of CO and CO2 on iron catalysts

Bayer, James; Stein, K. C.; Hofer, L. J. E.; Anderson, R. B.

doi:10.1016/0021-9517(64)90122-8

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…The value of ε was determined by considering the paraffin formation reaction as a representative one, especially for cobalt catalysts. The average value of ε was calculated to be ε = −0.67 (10) for carbon numbers (n) from 1 to 40. For a negative value of ε, eq 9 can be integrated to obtain exit conversions X CO,out for a fixedbed reactor:…”

Section: Catalyst Preparation Commercial Technical-gradementioning

confidence: 99%

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Poisoning of a Silica-Supported Cobalt Catalyst due to Presence of Sulfur Impurities in Syngas during Fischer–Tropsch Synthesis: Effects of Chelating Agent

Bambal

Guggilla

Kugler

et al. 2014

Ind. Eng. Chem. Res.

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The effects of sulfur impurities on the performance of cobalt-based Fischer–Tropsch catalysts are evaluated under industrially relevant operating conditions of temperature, pressure, and impurity levels. Chelating agents (CAs) were used to modify the SiO2 support, and the performances of the CA-modified catalysts are compared with conventional Co/SiO2 catalysts. For both the Co/SiO2 and CA-modified catalysts, the presence of sulfur in the inlet syngas results in a notable drop in the CO conversion, an undesired shift in the hydrocarbon selectivity toward short-chain hydrocarbons, more olefins in the products, and lower product yields. In the post-poisoning stage, i.e., after termination of sulfur introduction in the inlet syngas, the CA-modified catalysts recover activity and selectivity (to some extent at least), whereas such trends are not observed for the base-case, i.e., unmodified Co/SiO2 catalyst. The improved performance of the CA-modified catalysts in the presence of sulfur is attributed to higher densities of active sites.

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Section: Catalyst Preparation Commercial Technical-gradementioning

confidence: 99%

“…Many previous studies ,,− have elucidated the effect of sulfur on commercially used Fe-based ,,− and Co-based ,, catalysts for Fischer–Tropsch synthesis (FTS). Madon and Shaw have presented a detailed review of earlier work on the effect of sulfur on FT catalysts.…”

Section: Introductionmentioning

confidence: 99%

Poisoning of a Silica-Supported Cobalt Catalyst due to Presence of Sulfur Impurities in Syngas during Fischer–Tropsch Synthesis: Effects of Chelating Agent

Bambal

Guggilla

Kugler

et al. 2014

Ind. Eng. Chem. Res.

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“…The sulfur poisoning of a precipitated Fe catalyst has been reported elsewhere 71,73 . The addition of a large amount of MnO in Fe-catalysts was observed to improve the H 2 S tolerance (ca.…”

Section: Response Of Promoted Ft Catalysts To Sulfur Impuritiesmentioning

confidence: 91%

Study of the Effect of Surface Modification and Sulfur Impurities in Syngas on the Fischer-Tropsch Performance of Cobalt Catalysts

Bambal¹

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The effect of surface modification of the silica support on the Fischer-Tropsch (FT) activity and the selectivity of cobalt catalyst were studied. The catalysts were characterized by N 2physisorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature programmed reduction (TPR) and hydrogen chemisorption. FT was carried out in a fixed-bed reactor at 230 °C, 20 bar and 9000 sccm/h/g cat , using syngas with H 2 /CO = 2.0. Surface modification with chelating agents (CAs), i.e., nitrilotriacetic acid (NTA) and ethylenediaminetetracetic acid (EDTA), results in a smaller crystallite size of cobalt oxides after the calcination. In addition, the CA-modified catalysts contain well-dispersed cobalt oxides and higher number of catalytic sites on the surface. The CO conversions and the hydrocarbon yields, i.e., gC/Kg cat /h, are notably higher for the CA-modified catalysts at different operating temperatures. The structure-activity relationships based on the findings confirm the advantage of CA modification of the support during catalyst synthesis. In the next step, catalysts were subjected to poisoning by 10 and 50 ppm sulfur in the syngas. At both the concentrations, the sulfur is noted to adsorb irreversibly on the surface and to cause permanent loss in the activity. In the presence of sulfur, the performance of both CA-modified catalysts is better compared to that of the base catalyst. The sulfur poison affects the hydrogenation and the chainpropagation ability of the catalysts, and shifts the product selectivity towards short-chain hydrocarbons with a higher percentages of olefins. Highly dispersed CA-modified catalysts have a longer life in the presence of sulfur poison. iii ACKNOWLEDGEMENTS I would like to gratefully acknowledge the Department of Chemical Engineering, West Virginia University for providing me this fantastic opportunity to pursue PhD in the department. I would like express my sincere gratitude and appreciation to the enthusiastic supervision of Dr. Dady Dadyburjor during this doctoral research work. With his enthusiasm, his inspiration, and his great efforts to explain things clearly and simply, he helped to make this work, a great experience for me. Throughout my research, he provided encouragement, sound advice, good teaching, good company, and lots of sensible ideas. The work would be impossible without the always involved Dr. Edwin Kugler. My sincere thanks Dr. Todd Gardner for giving the opportunity through this project to work at NETL. I would also like to acknowledge Dr. John Zondlo and Dr. John Penn, for their willingness to serve as a member of my examining committee. Beyond the educational and technical guidance, my deepest thanks must go to my mother Sandhya Bambal and father Suresh Bambal who made everything in my life possible. Their love, belief, and guidance will never go unappreciated. I am forever indebted to my brother Manish Bambal and sister-in-law Trupti Bambal for their understanding, endless patience and encouragement when it was most required throughout...

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Electron probe studies of an iron ammonia synthesis catalyst

Chen

Anderson

1972

Journal of Colloid and Interface Science

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Effect of preadsorbed sulfur compounds on chemisorption of CO and CO2 on iron catalysts

Cited by 11 publications

References 6 publications

Poisoning of a Silica-Supported Cobalt Catalyst due to Presence of Sulfur Impurities in Syngas during Fischer–Tropsch Synthesis: Effects of Chelating Agent

Poisoning of a Silica-Supported Cobalt Catalyst due to Presence of Sulfur Impurities in Syngas during Fischer–Tropsch Synthesis: Effects of Chelating Agent

Study of the Effect of Surface Modification and Sulfur Impurities in Syngas on the Fischer-Tropsch Performance of Cobalt Catalysts

Electron probe studies of an iron ammonia synthesis catalyst

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