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A two step Microwave-assisted coke resistant mesoporous Ni-Co catalyst for methane steam reforming

Etminan, A ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.fuel.2021.122411
  3. Publisher: Elsevier Ltd , 2022
  4. Abstract:
  5. Methane steam reforming (MSR) is an assuring reaction using steam to produce H2 as clean energy over a nicκel-based catalyst. We synthesized mesoporous monometallic NiMgAl2O4 and bimetallic NiCoMgAl2O4 catalysts in a two-step combustion method using a mix of fuels and powder metallurgy. BET-BJH, XRD, TGA, TPR, FESEM, and EDX-mapping characterized surface area, porosity, morphology, crystalline structure, and metal-support interaction behavior. The products exhibited strong interaction of well-structured MgAl2O4 spinel with NiO, in both specimens. The MSR evaluation tests at 750 °C under atmospheric pressure, CH4:H2O feed ratio of 1:1.2 showed the bimetallic catalyst has the highest conversion of 99.30% with low carbon deposition(0.09% weight loss), after 15 h. Both catalysts demonstrated a miniature nickel particle sintering. TG analysis revealed 0.0059 and 0.0035 mg lamentous carbon deposited on 3.4820 mg NiMgAl2O4 and 3.4820 mg NiCoMgAl2O4, respectively. Also, no XRD diffraction peaks related to the lamentous carbon were observed. Moreover the carbon balance showed the higher recovery of carbon (close to 1) for Co-promoted catalyst. Highly dispersed active Ni species might be responsible for high catalyst activity and resistant to coking in the MSR reaction. © 2021
  6. Keywords:
  7. Atmospheric pressure ; Binary alloys ; Carbon ; Catalyst activity ; Combustion synthesis ; Magnesium compounds ; Methane ; Nickel oxide ; Powder metallurgy ; Sintering ; Steam ; Steam reforming ; X ray diffraction ; Co-promoted catalyst ; Mesoporous ; Methane steam reforming ; Mgal2O4 spinel ; Microwave-assisted ; Ni-Co catalysts ; Nial2O4 spinel ; Promoted catalysts ; XRD ; ]+ catalyst ; Morphology
  8. Source: Fuel ; Volume 317 , 2022 ; 00162361 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0016236121022833