Improvement in the hydrodesulfurization of dibenzothiophene over supported NiMoW catalysts
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Improvement in the hydrodesulfurization of dibenzothiophene over supported NiMoW catalysts Anayeli Yazmín Gallegos‑Hernández1 · Merced Martínez‑Rosales2 · José L. Rico3 · M. Avalos‑Borja1 Received: 24 September 2020 / Accepted: 19 November 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Various supported NiMoW sulfided catalysts were synthetized and tested in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The influence of cetyl trimethyl ammonium bromide (CTAB) on the properties of titania, silica and Si–Ti mixed oxide, prepared by sol–gel and used as supports, was evaluated. The active metals were then sequentially co-impregnated on the carrier. For all catalysts, the Ni/[Ni(MoW)] and Mo/W atomic ratios were kept constant and equal to 0.5 and 1, respectively. In addition, the total metal content was 18 wt% for each sample. All catalysts were characterized by BET, TEM, XRD and UV–Vis. The use of CTAB as a surfactant influences the textural properties of the supports. Among the studied samples, the best catalyst was NiMoW/Si–Ti, which showed a DBT conversion of 94% after 5 h of reaction at 320 °C and 5.3 MPa. For comparison, a commercial NiMo/Al2O3 catalyst was used as a reference. Keywords Hydrodesulfurization of dibenzothiophene · Supported NiMoW catalysts
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s1114 4-020-01909-2) contains supplementary material, which is available to authorized users. * M. Avalos‑Borja [email protected] 1
Instituto Potosino de Investigación Científica y Tecnológica A. C., División de Materiales Avanzados, Camino a la Presa San José 2055, Lomas 4ª sección, 78216 San Luis Potosí, S.L.P., Mexico
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Departamento de Química, División de Ciencias Naturales y Exactas, Campus Guanajuato, Universidad de Guanajuato Unidad Noria Alta, 36050 Guanajuato, Gto, Mexico
3
Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, 58060 Morelia, Michoacán, Mexico
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Reaction Kinetics, Mechanisms and Catalysis
Introduction Nowadays, deep HDS is the most important industrial process used to satisfy the environmental requirements related to the sulfur content in petroleum-derived fuels. Commonly, bimetallic metal sulfide catalysts based on Mo or W promoted with Ni or Co and supported on alumina are used in the industry [1]. Up to now, there have been many attempts to synthesize new HDS catalysts with an increased activity and selectivity for the elimination of refractory S-containing molecules. Different approaches have been tried to reach this objective, among them, the development of new catalytic supports (metal oxides) [2, 3], tuning for active phase composition [4], use of chelating agents during catalyst synthesis [5, 6], and sulfidation change or reaction conditions. Recently, some promising experimental results have been published in relation to the synthesis and characterization of supported trimetallic catalysts for deep HDS [7, 8]. I
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