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Keywords:

  • carbon;
  • cerium;
  • nickel;
  • oxidation;
  • supported catalysts

Abstract

Perovskite NaCeTi2O6 (NCT)-supported Ni catalysts were prepared and examined for the steam reforming of methane (SRM) with a low H2O/CH4 ratio (1:1), and their structures were characterized by means of powder XRD, energy dispersive X-ray spectroscopy high resolution TEM, temperature-programmed desorption of CO2, temperature-programmed reduction with H2, Ni K-edge/Ce LIII-edge X-ray absorption near edge structure spectroscopy and extended X-ray absorption fine structure . A 4 wt % Ni/NCT catalyst exhibited higher activity than 4 wt % Ni/TiO2, Ni/(CeO2+TiO2), and Ni/Ce2O3 catalysts for SRM reactions at 973 K, and better resistance to carbon deposition was observed on 4 wt % Ni/NCT compared to 4 wt % Ni/CeO2. It is suggested that the characteristic performance of the Ni/NCT catalysts for the SRM reactions are related to the basic character and oxygen conducting behavior of NCT to control the balance of CH4 decomposition and carbon gasification with steam on the surfaces of the Ni/NCT catalysts.