Effect of H2S on oxidative steam reforming of biogas for syngas production over MgAl-supported Ni–Ce-based catalysts

Doğan Özcan M., Özcan O., Akın A.

International Journal of Hydrogen Energy, cilt.143, ss.1186-1197, 2025 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 143
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.ijhydene.2025.01.156
  • 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, Chimica, Communication Abstracts, Compendex, Environment Index, INSPEC
  • Sayfa Sayıları: ss.1186-1197
  • Anahtar Kelimeler: Biogas, H2S, Ni–Ce-based catalysts, Oxidative steam reforming, Syngas
  • Kocaeli Üniversitesi Adresli: Evet

Özet

This study investigates the effect of hydrogen sulfide (H2S) on the oxidative steam reforming (OSR) of biogas over particulate and monolithic NiCe/MgAl catalysts synthesized via the sol-gel method followed by the incipient wetness impregnation. Catalytic performance was evaluated in a flow reactor at 600 °C, 700 °C, and 800 °C under a constant space velocity of 45,000 mL gcat-1 h-1 and a CH4/CO2/O2/H2O molar feed ratio of 1/0.67/0.1/0.3, under H2S concentrations of 0, 12, and 50 ppm. Characterization was conducted using N2 physisorption, XRD, SEM, TGA, XPS and ICP-OES. Monolithic NiCe/MgAl (NCMA) exhibited reduced carbon deposition across all temperatures, whereas particulate NCMA achieved the highest CH4 (94%) and CO2 (80%) conversions at 800 °C. With 12 ppm H2S, particulate NCMA showed only a 10% decrease in CH4 conversion after 270 min. At 50 ppm H2S, both catalysts experienced significant deactivation, with CH4 conversion declining by approximately 50% after 270 min.