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Preparation and Evaluation of Mesoporous Nanostructured Nickel Catalysts for Syngas Production by Combined Reforming of Methane

Jalali, Ramin | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50483 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Baghalha, Morteza; Rezaei, Mehran
  7. Abstract:
  8. In this study, the effect of nano-structure mesoporous supports on the performance of the nickel catalysts in the combined reforming process was investigated. In the first part, magnesium aluminate spinel was prepared using a sol-gel method and employed as a catalyst support for the preparation of nickel catalysts with various nickel contents. The samples were characterized using BET, XRD, TPR, TPO, CO chemisorption and SEM techniques. The results showed that increasing the nickel content up to 7.5 wt.% improved the catalytic activity, but further increase in nickel content decreased the activity due to the decrease in the nickel dispersion. The catalysts except of the sample with 2.5 wt.% Ni exhibited high stability in combined reforming. The results of the TPO and SEM analyses confirmed that the carbon was not deposited on the surface of the spent catalysts under the reaction conditions used for the combined reforming. In addition, the effect of the support modifiers (cobalt, copper, iron, nickel and zinc) was studied in order to improve the catalytic activity and stability. The obtained results showed that the higher the surface area, the higher the activity, and then the support with higher thermal stability possessed higher stability in this reaction. The catalyst supported on the support modified with nickel possessed the highest surface area and nickel dispersion and consequently showed the lowest degree of carbon deposition on the catalyst surface
  9. Keywords:
  10. Nickel ; Synthesis Gas ; Methane Conversion ; Mesoporous Materials ; Nickel Catalyst ; Nanostructure ; Mesoporous Structure ; Complex Reforming

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