Physico-chemical characterization and catalysis on mesoporous Al-HMS supported molybdenum hydrotreating catalysts

HMS and Al-HMS materials were synthesized by neutral templating pathway and Mo, CoMo, NiMo catalysts were prepared using them as the support. On Al-HMS material (Si/Al = 35) as the support, Mo concentration varied from 2 to 14 wt.%. The promotional effects were studied on 10 wt.% Mo/Al-HMS using 1-5 wt.% Co and Ni. All these catalysts were characterized by surface area, X-ray diffraction (XRD), temperature programmed reduction (TPR) and oxygen chemisorption methods. The catalytic activities for HDS, HYD and HDO were evaluated on sulfided catalysts. The oxygen chemisorption and catalytic activities as a function of Mo loading indicated that a correlation exists between these two parameters for all these reactions. A comparison with gamma-Al2O3 supported catalysts indicated that these catalysts exhibit higher activities. The results on HMS, Al-HMS supported catalysts indicated that HMS mesoporous structure has a unique ability to impart higher activities in the supported MoS2 phase through metal support interactions. (C) 2002 Elsevier Science B.V. All rights reserved.