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TitleCatalysts for hydrocracking and refining heavy oils and tars part 3: the effect of presulphiding conditions on catalyst performance
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorTernan, M; Whaley, M J
SourceCanada Centre for Mineral and Energy Technology, Energy Research Program, Energy Research Laboratories, Report 75-110 ( R), 1975, 31 pages, Open Access logo Open Access
PublisherEnergy, Mines and Resources Canada
Mediapaper; on-line; digital
File formatpdf
Released1975 01 01; 2017 06 30
AbstractCatalysts used in commercial hydrorefining reactors are often presulphided with CS2 or some other sulphur compound prior to the introduction of the hydrocarbon feedstock. The presulphiding process converts the catalyst from its oxidized form to a sulphided form. Increased catalyst life and catalyst activity have frequently been obtained by presulphiding. Virtually all industrial experience with presulphiding has been obtained with top feed trickle bed reactors, usually with a naphtha or gas oil feedstock which is in the vapour phase under reaction conditions. In contrast studies at the Energy Research Laboratories have been performed with bottom feed liquid phase reactors and higher boiling feedstocks such as bitumens or heavy gas oils. In order to determine whether or not similar beneficial effects occur with the reaction systems used at the Energy Research Laboratories, a series of presulphiding experiments was performed. It was found that the sulphur content of the catalyst could vary from 2 to 4 wt % depending upon the presulphiding conditions used. After the catalyst had been in contact with the reaction mixture, its sulphur content approached the value required for all of the nickel and molybdenum in the catalyst to exist as Ni3 S2 and MoS 2 . The properties of the liquid hydrocarbon product and the wt % coke in the catalyst were found to be approximately the same regardless of the presulphiding conditions used. Presulphiding with the feedstock produced essentially the same results as presulphiding with other materials such as CS2 and H2S. The high sulphur content in the feedstock and the liquid phase operation of the reactor probably combined to produce the favourable results obtained when the feedstock was used for presulphiding.

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