Effect of Hydrothermal Synthesis Temperature of NiCe/MgAl on Catalytic Activity at Oxy-Steam Reforming of Biogas

Doğan Özcan M., Akın A. N.

NCC-8 National Catalysis Congress, Ankara, Türkiye, 9 - 12 Eylül 2021, ss.114

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: Ankara
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.114
  • Kocaeli Üniversitesi Adresli: Evet

Özet

Biogas, an attractive renewable energy source, is mainly derived by anaerobic fermentation of organic wastes from different resources. Also, biogas is mainly composed of CH4 and CO2 that can be reformed on a suitable catalyst to syngas for downstream Fischer–Tropsch synthesis for producing chemicals such as methanol. Among different reforming reactions, oxy-steam reforming (OSR) reduces sintering and carbon deposition on the catalyst and high energy consumption with the inclusion of O2 and H2O in the process [1]. From the catalytic point of view, high surface area, coke deposition resistance, thermal stability, and economical catalysts are needed for OSR. Therefore, Nickel-based catalysts have attracted extensive attention in OSR due to their high activity and low cost compared to noble metals [2].

In this work, NiCe/MgAl, wt.%10 Ni and wt.%2.5 Ce (Ni10Ce2.5/MgAl), was prepared and tested in oxy-steam reforming of model biogas to syngas. Firstly, MgAl hydrotalcite-like support with Mg:Al molar ratio of 3 was synthesized by hydrothermal method at different temperatures (100 °C - 150 °C - 170 °C - 200 °C). In addition, active metal loadings of Ni and Ce were performed by sequential impregnation technique. All the catalysts were tested in a downflow fixed-bed quartz reactor system at varying reaction temperatures of 600 °C, 700 °C and 800 °C under atmospheric pressure. The feed gas molar ratios of CH4/CO2/O2/H2O = 1/0.67/0.1/0.3 were selected throughout all runs. Effects of hydrothermal synthesis temperature of MgAl hydrotalcite-like support were discussed based on product distribution. All fresh and spent catalysts were characterized by XRD, BET, ICP-OES and XPS analyses.

References

[1] X. Zhao, H. T. Ngo, D. M. Walker, D. Weber, D. Maiti, U. Cimenler, A. D. Petrov, B. Joseph, J. N. Kuhn, Chemical Engineering Communications, 205 (2018) 1129-1142.

[2] A. V. P. Lino, Y. N. C. Calderon, V. R. Mastelaro, E. M. Assaf, J. M. Assaf, Applied Surface Science, 481 (2019) 747-760.