Adsorption mechanism of Boscan porphyrins on MoO3' Co3O4and CoMoAl2O3

✍ Scribed by Alfredo Morales; Roberto Galiasso

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 616 KB
• Volume: 61
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(82)90286-1

✦ Synopsis

The adsorption of Boscan porphyrins on Co-Mo/Al,O, and molybdenum and cobalt oxides was studied with the aim of establishing the mechanism of vanadium elimination during the hydrodemetallization (HDM) of heavy oils. The results show a change in the e.p.r. signal of VO *+ and in the u.v.-visible bands of the porphyrins adsorbed on the catalyst. This change is not observed on the support alone. Under the hydrotreating conditions used, only the Co-~~/Al~O~catalysts show a high demetailization activity. As the support alone does not show HDM activity, the cobalt and molybdenum species on the surface, are the demetallization agents.