Influence of Frame Connectivity of SBA-15 and KIT-6 Supported NiMo Catalysts for Hydrotreating of Gas Oil
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Influence of Frame Connectivity of SBA-15 and KIT-6 Supported NiMo Catalysts for Hydrotreating of Gas Oil Kapil Soni • K. C. Mouli • A. K. Dalai J. Adjaye
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Received: 18 November 2009 / Accepted: 20 February 2010 / Published online: 9 March 2010 Ó Springer Science+Business Media, LLC 2010
Abstract The feasibility of mesoporous silica as support to NiMo catalysts for hydrotreating of gas oil derived from Athabasca bitumen was tested in a trickle bed reactor at industrial conditions. High quality two dimensional (2D) hexagonal SBA-15 and three dimensional (3D) cubic KIT6 supports were prepared by sol–gel method. The supports and catalysts were characterized by different characterization techniques such as N2 physisorption, X-ray diffraction (XRD), Temperature programmed reduction (TPR), and DRIFT spectroscopy. The XRD and N2 adsorption–desorption analysis shows the stability of structure after metal loadings. Presence of high NiMoS centres which is responsible for higher hydrotreating activities in KIT-6 supported catalysts is demonstrated by DRIFT spectroscopic analysis. HDN and HDS activities of NiMo catalysts supported on SBA-15 and KIT-6 were studied using coker light gas oil at temperature, pressure and LHSV of 370 °C, 8.8 MPa and 2.0 h-1, respectively. KIT-6 supported catalysts shows much higher hydrodesulfurization (HDS) and Hydrodenitrogenation(HDN) activities compared to SBA-15 counterpart due to the fact that 3D-interconnected mesopores caused better dispersion of active species and faster diffusion of reactants and products.
K. Soni K. C. Mouli A. K. Dalai (&) Laboratories of Catalysis and Chemical Reaction Engineering, Department of Chemical Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada e-mail: [email protected] J. Adjaye Syncrude Edmonton Research Centre, Edmonton, AB T6N 1H4, Canada
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Keywords SBA-15 KIT-6 NiMo catalyst DRIFT of adsorbed CO Hydrotreating Coker light gas oil NiMoS phase
1 Introduction Hydrotreating of petroleum fractions has become a key process in the modern petroleum refining industry due to increasing environmental concern [1]. Typically industrial catalysts are CoMo and NiMo supported on alumina but these catalysts are facing strong challenges due to stringent environmental constraints (a target of about 15 ppm in diesel fuel by 2010). In order to improve the activity of hydrotreating catalysts, many approaches such as preparation method, support modification and altering the active component have been followed. Among these approaches, support modification is an important one [2, 3]. Wide variety of materials such as zeolites [4, 5], Oxides such as SiO2 [6], TiO2 [7, 8], ZrO2 [9–12], Carbon [13] and mesoporous materials like mesoporous alumina [14], hexagonal mesoporous silica [15], MCM-41 [16–18], SBA-15 [19, 20], KIT-6 [21], FSM-16 [22], mesoporous carbon [23] have been studied as supports for hydrotreating catalysts. Among these mesoporous molecular sieves MCM-41 and HMS (Hexagonal mesoporous silica) have attracted much attention d
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