Alumina-magnesia-supported Ni for hydrogen production via the dry reforming of methane: a cost-effective catalyst system

Abdulaziz A. M. Abahussain, Ahmed S. Al-Fatesh*, Naitik Patel, Salwa B. Alreshaidan, Nouf A. Bamatraf, Ahmed A. Ibrahim, Ahmed Y. Elnour, Jehad K. Abu-Dahrieh*, Ahmed E. Abasaeed, Anis H. Fakeeha, Rawesh Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
50 Downloads (Pure)

Abstract

5Ni/MgO and 5Ni/γAl2O3 are pronounced in the line of cheap catalyst systems for the dry reforming of methane. However, the lower reducibility of 5Ni/MgO and the significant coke deposition over 5Ni/γAl2O3 limit their applicability as potential DRM catalysts. The mixing capacity of MgO and Al2O3 may overcome these limitations without increasing the catalyst cost. Herein, a 5Ni/xMg(100 − x)Al (x = 0, 20, 30, 60, 70, and 100 wt. %) catalyst system is prepared, investigated, and characterized with X-ray diffraction, surface area and porosity measurements, H2-temperature programmed reduction, UV-Vis-IR spectroscopy, Raman spectroscopy, thermogravimetry, and transmission electron microscopy. Upon the addition of 20 wt. % MgO into the Al2O3 support, 5Ni/20Mg80Al is expanded and carries both stable Ni sites (derived through the reduction of NiAl2O4) and a variety of CO2-interacting species. CH4 decomposition at Ni sites and the potential oxidation of carbon deposits by CO2-interacting species over 5Ni/20Mg80Al results in a higher 61% H2-yield (against ~55% H2-yield over 5Ni/γAl2O3) with an excellent carbon-resistant property. In the major magnesia support system, the 5Ni/60Mg40Al catalyst carries stable Ni sites derived from MgNiO2 and “strongly interacted NiO-species”. The H2-yield over the 5Ni/60Mg40Al catalyst moves to 71%, even against a high coke deposition, indicating fine tuning between the carbon formation and diffusion rates. Ni dispersed over magnesia-alumina with weight ratios of 7/3 and 3/7 exhibit good resistance to coke. Weight ratios of 2/8 and 7/3 contain an adequate amount of reducible and CO2-interactive species responsible for producing over 60% of H2-yield. Weight ratio 6/4 has a proper coke diffusion mechanism in addition to achieving a maximum of 71% H2-yield.


Original languageEnglish
Article number2984
Number of pages16
JournalNanomaterials
Volume13
Issue number23
Early online date21 Nov 2023
DOIs
Publication statusPublished - Dec 2023

Keywords

  • General Materials Science
  • General Chemical Engineering
  • cheap catalyst
  • MgO
  • Ni catalyst
  • MgNiO2
  • Al2O3
  • DRM

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