Title: Hydrodesulfurization--4. Effects of the feed components on Co-Mo/Al/sub 2/O/sub 3/ catalyst activation
Abstract: A Girder G35 catalyst was reduced, sulfided at 400/sup 0/C by various treatments, and tested for the hydrodesulfurization of 0.3% benzothiophene in n-dodecane. The steady-state conversion at 250/sup 0/C was 75% if the reduced catalyst was pretreated with 6% H/sub 2/S in hydrogen; it was 58% if n-dodecane was added to the H/sub 2/S/H/sub 2/ feed; it was 50% if the catalyst was first treated with n-dodecane in hydrogen and then with H/sub 2/S in hydrogen; it was 45% if the two steps of the previous treatment were reversed; it was 36% on the untreated reduced catalyst; it was 33% if the catalyst was pretreated only with n-dodecane in hydrogen; it was 43% if the catalyst was treated with thiophene in hydrogen; and it was 28% if the pretreatment was done with hydrogen/thiophene/dodecane. These results and analyses of the events during the pretreating and initial transient reaction stages indicated that both n-dodecane and benzothiophene poison a part of the surface sites by coke lay-down, but that on the presulfided catalyst, benzothiophene protected the catalyst from deactivating by competing with solvent adsorption and by preventing desulfiding of the catalyst.
Publication Year: 1980
Publication Date: 1980-09-01
Language: en
Type: article
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