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Inhibiting effect of H2S on the DBT HDS activity of Ru-based catalysts—effect of the Cs addition
- Source :
-
Journal of Catalysis . Jun2004, Vol. 224 Issue 2, p243-251. 9p. - Publication Year :
- 2004
-
Abstract
- The effect of the Cs addition on the H2S inhibition and subsequently on the DBT HDS activity over Ru-based catalysts was investigated. In good agreement with a previous study, the HDS activity over a Ru catalyst containing cesium was much higher than that over the same Ru catalyst without cesium. On the other hand, the HDS activity of the Ru&z.sbnd;Cs catalyst was more inhibited by H2S than that of the Ru catalyst at 260 °C. Thus, kinetic parameters were calculated using a Langmuir–Hinshelwood model to determine the mechanism of the H2S inhibition over Ru and Ru&z.sbnd;Cs catalysts. We found that the heats of adsorption of DBT and H2S on the Ru&z.sbnd;Cs catalyst were higher than on the Ru catalyst, indicating that the sulfur-containing species adsorb more strongly on the catalyst containing cesium. Subsequently, the role of cesium in the Ru&z.sbnd;Cs catalyst on the DBT HDS activity was investigated by using 35S-tracer experiments. The results suggested that while the Ru&z.sbnd;Cs catalyst was more inhibited by H2S, the Ru&z.sbnd;S bonds were more stable on this catalyst than on the Ru catalyst. This Ru&z.sbnd;S bond stabilization was responsible for the stabilization of the active phase, which allowed creation of a greater amount of sulfur atoms potentially labile. Thus, that explained the better HDS activity over the Ru&z.sbnd;Cs catalyst than over the Ru catalyst, despite a greater H2S inhibition on the former. [Copyright &y& Elsevier]
- Subjects :
- *ALKALI metals
*CESIUM
*CATALYSIS
*ALUMINUM oxide
Subjects
Details
- Language :
- English
- ISSN :
- 00219517
- Volume :
- 224
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 13060608
- Full Text :
- https://doi.org/10.1016/j.jcat.2004.02.031