Advanced sulfur control concepts in hot-gas desulfurization technology. Quarterly report 14, July--October 1997

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Experimental work during the quarter was limited to a series of CeO{sub 2} reduction tests using an atmospheric pressure electrobalance reactor. Both Rhonc-Poulenc and Molycorp CeO{sub 2} were tested over a temperature range of 600 to 1000{degrees}C in various reducing gas compositions. Experimental results are in reasonable agreement with equilibrium calculations of the oxygen partial pressure from CHEMQ coupled with earlier experimental results from Bevan and Kordis. Weight loss corresponding to the reduction of CeO{sub 2} to CeO{sub 1.86} was observed at 1000{degrees} in an atmosphere of 40% H{sub 2}, 3.5% CO{sub 2}, balance He. Helium was used as the ... continued below

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20 p.

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Harrison, D.P. October 1, 1997.

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Experimental work during the quarter was limited to a series of CeO{sub 2} reduction tests using an atmospheric pressure electrobalance reactor. Both Rhonc-Poulenc and Molycorp CeO{sub 2} were tested over a temperature range of 600 to 1000{degrees}C in various reducing gas compositions. Experimental results are in reasonable agreement with equilibrium calculations of the oxygen partial pressure from CHEMQ coupled with earlier experimental results from Bevan and Kordis. Weight loss corresponding to the reduction of CeO{sub 2} to CeO{sub 1.86} was observed at 1000{degrees} in an atmosphere of 40% H{sub 2}, 3.5% CO{sub 2}, balance He. Helium was used as the carrier gas instead of nitrogen to reduce aerodynamic noise, and the H{sub 2} and CO{sub 2} concentrations were chosen since this mixture results in oxygen partial pressure similar to those expected in Shell gas. The experimental value of CeO{sub 1.86} compares quite favorably to the predicted value of CeO{sub 1.83}. One unexpected results was a weight loss of about 9% from Rhone-Poulenc CeO{sub 2} in an inert atmosphere at 600{degrees}C. BET surface area measurements of nine samples were performed consisting of as-received CeO{sub 2} (both Rhone Poulenc and Molycorp), as-received Al{sub 2}O{sub 3}, both CeO{sub 2} samples with Al{sub 2}O{sub 3} as initially charged to the reactor, and both CeO{sub 2}-Al{sub 2}O{sub 3} mixtures after multicycle sulfidation-regeneration tests. The BET surface area of the Rhone-Poulenc CeO{sub 2} was about 20 times larger than the surface area of Molycorp CeO{sub 2} which explains differences in sulfidation performance reported earlier. Finally a more complete search of the literature for thermodynamic data for cerium compounds was carried out. It appears that the free energy of formation of CeO{sub 2} as a function of temperature is well defined.

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20 p.

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OSTI as DE98052872

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  • Other Information: PBD: Oct 1997

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  • Other: DE98052872
  • Report No.: DOE/MC/30012--14
  • Grant Number: AC21-94MC30012
  • DOI: 10.2172/597630 | External Link
  • Office of Scientific & Technical Information Report Number: 597630
  • Archival Resource Key: ark:/67531/metadc689744

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 10, 2015, 6:50 p.m.

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Harrison, D.P. Advanced sulfur control concepts in hot-gas desulfurization technology. Quarterly report 14, July--October 1997, report, October 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc689744/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.