Activation of off site presulfided CobaltMolybdenum catalysts

✍ Scribed by P. Dufresne; N. Brahma; F. Labruyère; M. Lacroix; M. Breysse

• Book ID: 103934319
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 288 KB
• Volume: 29
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(95)00280-4

✦ Synopsis

An oxidic Co-M® catalyst presulfided by the SULFICAT ® process has been studied by XPS. Results indicate that the strong interaction of the alkylpolysulfide with the solid provokes a partial reduction of both the sulfur and molybdenum ions. Treated under hydrogen, the adsorbed species decompose at temperatures as low as 160-220°C converting the initial M® 6+ species into sulfided M® 4+. The sulfidation state of the active phase increases with the hydrogen pressure. Comparison with the conventional sulfiding procedure indicates that the SULFICAT ® process results in a higher dispersion of the sulfided active phase.