1. Activity and surface properties of NiMo/SiO2–Al2O3 catalysts for hydroprocessing of heavy oils
- Author
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Françoise Maugé, Jorge Ramírez, Jorge Ancheyta, Mohan S. Rana, Laurence Mariey, Arnaud Travert, Carolina Leyva, Laboratoire catalyse et spectrochimie (LCS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Université de Caen Normandie (UNICAEN), Normandie Université (NU), Departamento de Ingenieria Quimica, Facultad de Quimica (UNICAT), UNAM, and Roland, Pascal
- Subjects
Sulfide ,Inorganic chemistry ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Catalysis ,Adsorption ,Physisorption ,Hydrotreating ,[CHIM] Chemical Sciences ,[CHIM]Chemical Sciences ,chemistry.chemical_classification ,Chemistry ,Process Chemistry and Technology ,Coke ,Heavy oil ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,FT-IR ,Hydrodenitrogenation ,CO adsorption ,Mixed oxide ,0210 nano-technology ,Hydrodesulfurization ,NiMo/SiO2-Al2O3 catalysts - Abstract
International audience; NiMo/SiO2-Al2O3 mixed oxide supported catalysts were investigated for hydroprocessing of heavy crude oil at moderate reaction conditions. Hydrodesulfurization (HDS), hydrodemetalization (HDM), hydrodeasphaltenization (HDAs) and hydrodenitrogenation (HDN) reactions were studied as function of time-on-stream (TOS). The results indicated that HDS of crude oil corresponds to the number of active metal sites (sulfide phases) present in the catalyst, HDN is enhanced when the catalyst presents a combination of well dispersed sulfide phases and weak to moderate acidity. HDM presented a complex behavior indicating that it is affected significantly not only by the dispersion of the sulfide phase but also by the porosity and acidity of the catalyst. As expected, for HDAs both acidity and textural properties are important. The stability of the catalyst with time-on-stream was affected by coke and metals deposition. The supports and fresh catalysts were characterized by nitrogen physisorption, SEM-EDX, and FT-IR of CO and pyridine adsorption. The results confirm that NiMo/SiO2-Al2O3 catalysts are a good option for the hydrotreatment of heavy oils and that the method used here for support preparation can tune the formation of meso- or macro-porosity and the type and strength of the catalyst acid sites. (C) 2012 Elsevier B.V. All rights reserved.
- Published
- 2012