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Microwave-Assisted Coke Resistance and Mesoporous Ni-Co Catalyst in two Steps for Methane Steam Reforming

Etminan, Azita | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54204 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhad, Khatiboleslam
  7. Abstract:
  8. Methane steam reforming (MSR) is an assuring reaction using steam to produce H2 as clean energy over a nickel-based catalyst. We synthesized monometallic NiMgAl2O4 and bimetallic NiCoMgAl2O4 catalysts in a two-step combustion method using urea, glycine, and sucrose, as fuel. BET-BJH, XRD, TGA, TPR, FESEM, and EDX-mapping characterized surface area, porosity, morphology, crystalline structure, and metal-support interaction behavior. The products exhibited well-structured, simple MgAl2O4 spinel and NiO without NiAl2O4, in both specimens. The MSR evaluation tests at 750℃ under atmospheric pressure, CH4: H2O feed ratio of 1:1.6 showed the bimetallic catalyst has the highest conversion (99.30%) with low carbon deposition (0.05%), after 15h. Both catalysts demonstrated a miniature nickel particle sintering. TG analysis revealed 0.0043 and 0.0033 mg filamentous carbon deposited on 3 mg NiMgAl2O4 and 3 mg NiCoMgAl2O4, respectively. No XRD diffraction peaks related to the filamentous carbon was observed. Light nickel particles distributed in the catalysts generated active sites for methane adsorption in the MSR reaction
  9. Keywords:
  10. Combustion Synthesis ; Powder Metallurgy ; Catalytic Activity ; Magnesium Aluminate Spinel ; Nickel Aluminate Spinel ; Catalysts Activity and Stabibility ; Carbon Deposition ; Methane Steam Reforming (MSR)

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