Sulfur in chromia |
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| Authors: | R E Lobnig H J Grabke H P Schmidt K Hennessen |
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| Affiliation: | (1) Max-Planck-Institut für Eisenforschung GmbH, 4000 Düsseldorf, Postfach 140 260, Max-Planck-Straße 1, Germany |
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| Abstract: | The solubility of sulfur in chromia has been studied in H2-H2O-H2S tagged with35S at 973 and 1173 K at low oxygen and sulfur partial pressures typical for coal gasification-systems. For monocrystalline samples, it has been shown that sulfur-containing species are only present adsorbed on the surface of the specimens and can be removed by ultrasonic cleaning in acetone. The surface coverage after 4 weeks of exposure to H2-H2O-H2S was between 2.8 and 19.3% of a monolayer. In polycrystalline chromia, sulfur was located only in pores and cracks of the sample. In dense, compact areas of the specimens the solubility of sulfur was below the detection limit of autoradiography, which was estimated to be better than 0.17 ppm. |
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| Keywords: | Sulfur chromia tracer sulfur solubility adsorption pores |
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