Hydrogenation of naphthalene on noble-metal-containing mesoporous MCM-41 aluminosilicates

✍ Scribed by S Albertazzi; R Ganzerla; C Gobbi; M Lenarda; M Mandreoli; E Salatelli; P Savini; L Storaro; A Vaccari

• Book ID: 104422330
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 285 KB
• Volume: 200
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/s1381-1169(03)00025-6

✦ Synopsis

Aromatic saturation of oil fractions is a key process in the refining industry due to increasing demand for cleanest distillates with superior performances. In this study, the behavior of different catalysts containing 1 wt.% of noble-metal inside a mesoporous MCM-41 (Si:Al = 20) framework was investigated in the hydrogenation of naphthalene, as preliminary step to investigate bimetallic catalysts. While at atmospheric pressure only Rh and Pd showed a low hydrogenation activity, in the tests performed at 6.0 MPa the catalytic activity grew, exhibiting the following order: Pt > Rh Pd ≫ Ru ≈ Ir. However, all the catalysts required a large H 2 excess, to avoid a decrease in hydrogenation and ring-opening activity, and gave rise to the best performance for a contact time of 6.8 s, favouring at lower values the partial hydrogenation to tetralin and at higher values cracking reactions. Finally, all the catalysts showed low thio-tolerance, with significant deactivation already feeding 100 ppm wt. of dibenzothiophene (DBT), with a partial reversibility only for the Pt-containing catalyst (CAT 3).