Effect of MoS2 morphology on the HDS activity of hydrotreating catalysts |
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Authors: | M Vrinat M Breysse C Geantet J Ramirez F Massoth |
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Affiliation: | (1) Corporate Research Laboratories, Exxon Research and Engineering Company, 08801 Annandale, NJ, USA |
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Abstract: | We have applied near-edge X-ray absorption fine structure (NEXAFS) to characterize the surface and bulk properties of LixNi1–xO catalysts. In our experimental set-up, NEXAFS spectra of powder materials could be obtained by measuring the intensity of either electron-yield or fluorescence-yield. While the electron-yield method is sensitive only to the top few atomic layers, the fluorescence-yield method can detect species up to a few thousands angstroms deep into the bulk structure. The ability to distinguish surface and bulk compositions is demonstrated in studies of a number of Li0.5Ni0.5O samples, of which the surface compositions vary as a function of preparation procedures. In addition, NEXAFS investigations following the reaction of LixNi1–xO with CH4 have also been carried out and the results indicate that the initial surface reaction intermediates are Li2CO3. |
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Keywords: | NEXAFS surface composition bulk composition lithium nickel oxide |
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