Influence of silica promotion on NiCe/MgAlSi catalysts for the oxy-steam reforming of biogas to syngas

ÖZCAN M., AKIN A. N.

International Journal of Hydrogen Energy, cilt.48, sa.60, ss.22988-23001, 2023 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 48 Sayı: 60
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1016/j.ijhydene.2023.02.089
  • Dergi Adı: International Journal of Hydrogen Energy
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Artic & Antarctic Regions, Chemical Abstracts Core, Communication Abstracts, Environment Index, INSPEC
  • Sayfa Sayıları: ss.22988-23001
  • Anahtar Kelimeler: Magnesium aluminum silicate, Oxy-steam reforming of biogas, Silica promotion, Sol-gel, Syngas
  • Kocaeli Üniversitesi Adresli: Evet

Özet

This work has exploited the effects of silica on magnesium aluminum silicate supported NiCe based catalysts (NiCe/MgAlSi) prepared using sol-gel method followed by incipient wetness impregnation for syngas production through oxy-steam reforming (OSR) of biogas. Measurements investigating the effects of increasing Si/Al molar ratio (0–5) on activity and carbon deposition were performed in a once-through flow reactor at atmospheric pressure and temperatures of 600, 700, and 800 °C with a fixed GHSV of 45,000 ml gcat−1 h−1 and molar feed ratio of CH4/CO2/O2/H2O = 1/0.67/0.1/0.3. The catalysts were characterized by N2-physisorption, XRD, SEM, HRTEM, TGA, Raman, and ICP-OES. In the results, the addition of silica has been found to increase Ni crystallite sizes and decrease carbon deposition. Thus, NiCe/MgAlSi with Si/Al = 5 is promising, exhibiting high conversions of CH4 (91.7%), CO2 (80.4%), and H2/CO ratio of 1.6 without carbon deposition and good stability for 120 h at 800 °C.