Mohan S. Rana

Abstract: Hydrotreating of model molecules over high specific surface area (SSA) Co(Ni)Mo/TiO 2 –SiO 2 mixed oxide supported catalysts has been investigated in a micro-catalytic reactor at 400 °C and atmospheric pressure. Activity studies are carried out for thiophene hydrodesulfurization (HDS) and 1-cyclohexene hydrogenation (HYD). The effect of support composition, molybdenum content (2–14 wt.% Mo) and promoters contents (1–5 wt.% Co or Ni) is examined. Supported catalysts are characterized by BET specific surface area, X-ray diffraction (XRD), pore volume, zero point charge (ZPC) and low temperature oxygen chemisorptions (LTOC). Sulfided catalysts showed wide range of activity variation with support composition which relishes that molybdenum sulfided active phases strongly depend on the nature and composition of support. LTOC and catalytic activity results showed similar trend with the effect of molybdenum variation indicating that the number of anion vacancies varies with variation of MoS 2 phases. The highest activities were observed at 8 wt.% Mo loading and after that activity decreases with decreasing the anionic vacancies. The characterization results of XRD, ZPC and LTOC are well agreed about the Mo monolayer formation. Incorporation of TiO 2 with SiO 2 alters the nature of weak interaction of active phases with SiO 2 support, and overcome it through poor dispersion on the support surface. Therefore, TiO 2 counterpart plays a role to provide high intrinsic activity and generate favorable morphology of MoS 2 phases and metal support interaction.

TL;DR: In this article, the HDS activity of NiMo sulfided catalysts supported on Al-, Ti-, and Zr-modified SBA-15 was measured using the thiophene and cracking of cumene as model reactions.

TL;DR: In this paper, the effect of sulfur and nitrogen contents on the activity of CoMo/Al2O3 hydrotreating catalyst was investigated using model reactants such as dibenzothiophene (DBT) for HDS, 2,6-dimethylaniline (DMA) for HDN, and 1-methylnapthalene (1-MN) for hydrodearomatization (HDA).

TL;DR: In this article, the authors investigated the recovery of Mo, V, and Ni metals from the industrial spent hydroprocessing catalyst, and the possibility of recycling of total spent catalyst was studied using various steps such as deoiling, drying, grinding, sieving, and decoking.

TL;DR: In this paper, an effect of zeolite with alumina as a support for heavy oil hydroprocessing is presented. But, the results indicate that the combination of ultra-stable zeolites and alumina is able to produce bi-modal type of pores in the catalyst which may contribute to a better combination of hydrodesulfurization (HDS), hydrodemetallization (HDM), and the selective cracking of asphaltene over the acidic catalysts.