Selectivity in Hds, Hdn, Hdo and Hydrocracking Contribution of Remote-control and Other New Concepts
(1995) 5th Workshop on Hydrotreating Catalysis — Location: UNIV SCI & TECHNOL LILLE, VILLENEUVE DASCQ (France) (5.April.1995)
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- Abstract
- This paper reviews some recent results in the field of hydrotreatment by sulfide catalysts. It comes in complement to a former review on the subject (1), by focusing more on new insights into the structure of the conventional CoMo (or NiMo) catalysts and the way they catalyze the various reactions involved. A first part constitutes an attempt to make an inventory of the types of catalytic sites : hydrogenation sites, sites active for the hydrogenolysis of carbon-heteroatom bonds, acidic sites either on the sulfide phase (probably -SH groups) or situated on the support. A second part discusses the influence of the morphology of the MoS2 crystallites, in particular the possibility that different catalytic functions be located on the rims and on the lateral edges. The variation in selectivity of the hydrotreatment catalysts as a function of the reaction conditions and their relative stability when the catalysts ages point to factors which are independent of initial morphology. The role of spillover hydrogen will be illustrated by new examples of our laboratory concerning hydrodenitrogenation, on the one hand, and the dramatic increase of acidity of silica alumina (by a factor of more than 10) under the influence of spillover hydrogen emitted by a sulfided CoMo/SiO2 catalyst, on the other hand. In the latter experiment, the hydrocracking of diphenyl methane served as a test reaction and the role of spillover was substantiated by H-D exchange experiments. In a last part, some prospects offered by the new advances will be outlined with a special emphasis on the controlled interconversion of sites due to remote control by spillover hydrogen. The new concepts can very likely be extended to many areas of hydrotreatment.
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Delmon, B. (1995). Selectivity in Hds, Hdn, Hdo and Hydrocracking Contribution of Remote-control and Other New Concepts. Societes Chimiques Belges. Bulletin, 104(4-5), 173-187. https://doi.org/10.1002/bscb.19951040402 (Original work published 1995)