Technology development for cobalt F-T catalysts. Final quarterly technical progress report No. 11, April 1, 1995--June 30, 1995

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Preliminary results on the effect of reaction temperature on the performance of Co catalysts during F-T synthesis obtained during the last quarter confirmed that Co catalysts were very sensitive to temperature and deactivated significantly at temperatures above 240{degree}C both in the fixed bed and the slurry bubble column reactors. Following this preliminary investigation, a series of tests were carried out during this period in order to elucidate the nature of this deactivation process as well as determine possible means of preventing it. In order to elucidate the nature of this deactivation process, the catalysts which had undergone significant deactivation after ... continued below

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178 p.

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Singleton, A.H. October 25, 1995.

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Preliminary results on the effect of reaction temperature on the performance of Co catalysts during F-T synthesis obtained during the last quarter confirmed that Co catalysts were very sensitive to temperature and deactivated significantly at temperatures above 240{degree}C both in the fixed bed and the slurry bubble column reactors. Following this preliminary investigation, a series of tests were carried out during this period in order to elucidate the nature of this deactivation process as well as determine possible means of preventing it. In order to elucidate the nature of this deactivation process, the catalysts which had undergone significant deactivation after high temperature (280{degree}C) reaction in either the fixed bed reactor or the slurry bubble column reactor were regenerated and retested in the fixed bed reactor. In both cases the catalysts recovered completely their initial activity. In addition, reactions at very high H{sub 2}CO ratios and high temperatures showed very little deactivation, suggesting that the deactivation of the Co catalysts during F-T synthesis at high temperatures was mainly due carbon formation via the Boudouard reaction. Due to the unreactive nature of this carbon, it could only be removed by calcination. A second series of experiments was carried out to investigate the effect of certain promoters (Zr, La, Cr, and Re) as well as the effect of another support such as silica on the deactivation characteristics of Co catalysts during F-T synthesis at high temperature. The results suggest that the deactivation process and rate for most of these catalysts are similar to those of the alumina-supported catalysts tested previously (Co.005 and Co-053), and that none of the promoters helps to slow down the rate of carbon formation at high temperatures above 240{degree}C.

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178 p.

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OSTI as DE96009009

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  • Other Information: PBD: 25 Oct 1995

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  • Other: DE96009009
  • Report No.: DOE/PC/92108--T13
  • Grant Number: AC22-92PC92108
  • DOI: 10.2172/224956 | External Link
  • Office of Scientific & Technical Information Report Number: 224956
  • Archival Resource Key: ark:/67531/metadc672415

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  • October 25, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Feb. 1, 2016, 2:36 p.m.

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Singleton, A.H. Technology development for cobalt F-T catalysts. Final quarterly technical progress report No. 11, April 1, 1995--June 30, 1995, report, October 25, 1995; United States. (digital.library.unt.edu/ark:/67531/metadc672415/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.