Deep Hydrodesulfurization of Dibenzothiophenes Over NiW Sulfide Catalysts Supported on Sol–Gel Titania–Alumina

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• 作者：J. A. Tavizón-Pozos ; V. A. Suárez-Toriello ; J. A. de los Reyes…
• 关键词：Hydrodesulfurization ; NiW ; Dibenzothiophene ; 4 ; 6 ; Dimethyldibenzothiophene ; Al2O3–TiO2 mixed oxide ; Support–metal interaction
• 刊名：Topics in Catalysis
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：59
• 期：2-4
• 页码：241-251
• 全文大小：1,206 KB
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• 作者单位：J. A. Tavizón-Pozos (1)
  V. A. Suárez-Toriello (1)
  J. A. de los Reyes (1)
  A. Guevara-Lara (2)
  B. Pawelec (3)
  J. L. G. Fierro (3)
  M. Vrinat (4)
  C. Geantet (4)
  
  1. Área de Ingeniería Química, Universidad A. Metropolitana-Iztapalapa, Av. FFCC R. Atlixco 186, 09340, Mexico, Distrito Federal, Mexico
  2. Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Hidalgo, Ciudad Universitaria, 42184, Pachuca, Mexico
  3. Instituto de Catálisis y Petroleoquímica, CSIC, C/Marie Curie 2, Cantoblanco, 28049, Madrid, Spain
  4. Institut de Recherches sur la Catalyse et l’Environnement de Lyon, UMR 5256 CNRS-Université Lyon 1, 2 Av. Einstein, 69626, Villeurbanne Cedex, France
  
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028

文摘

This work showed that the use of Al₂O₃–TiO₂ as carriers has a positive effect on the activity of supported NiW catalysts in the hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene carried out in a batch reactor at 320 °C and total H₂ pressure of 5.5 MPa. Two Al₂O₃–TiO₂ mixed oxides with Al/Ti atomic ratios of 10 and 2 were synthesized by sol–gel method together with the pure Al₂O₃ synthesized as reference support. For NiW/Al₂O₃–TiO₂ and NiW/Al₂O₃ catalysts, a metal load of 17 and 5.5 wt% of W and Ni were considered respectively. It was found that both Al₂O₃–TiO₂-supported catalysts exhibited higher activity than alumina-supported one. The catalyst with a largest TiO₂ content (NiW/AT2) demonstrated to be 23 % more active with respect to NiW/Al₂O₃. Solids were characterized by temperature-programmed reduction (TPR), high resolution transmission electronic microscopy and X-ray photoelectronic spectroscopy (XPS) techniques. A decrease in support–metal interaction (from TPR) was observed when Ti content increased, which could lead to a higher amount of NiWS phase (from XPS). Besides, a slight increase in the slabs length in WS₂ was observed for titania-containing catalyst with respect to NiW/Al₂O₃, indicating that the dispersion can still be optimized. The atomic ratio Al/Ti = 2 of the NiW/Al₂O₃–TiO₂ catalyst proved to be a potential substitute for current catalysts for sulfur reduction in ultra-clean diesel. Keywords Hydrodesulfurization NiW Dibenzothiophene 4,6-Dimethyldibenzothiophene Al₂O₃–TiO₂ mixed oxide Support–metal interaction