Iron Oxide over Silica-Doped Alumina Catalyst for Catalytic Steam Reforming of Toluene as a Surrogate Tar Biomass Species

摘要

An iron oxide over silica-doped alumina catalyst was successfully synthesized using one-pot, solvent-deficient method. The prepared Fe2O3/SiO2 Al2O3 catalyst was characterized using TGA/DTG, XRD, N-2 adsorption isotherm, NH3-TPD, and SEM. The TGA/DTG and XRD results show that the presence of Si enhances the stability of gamma-Al2O3 support at high temperatures. The prepared Fe2O3/SiO2 Al2O3 catalyst was obtained by calcination at 950 degrees C, with a high BET specific surface area (49 m(2)/g). The NH3-TPD showed that Fe addition can significantly increase catalyst acidity. SEM images confirmed the textural properties of the catalysts in term of surface morphology. The catalytic activity of Fe2O3/SiO2 Al2O3 catalysts was examined in a CREC fluidized riser simulator using toluene as model compound for biomass tar. Experiments with this catalyst yielded high toluene conversions. Composition of gases produced (H-2, CO, CO2, and CH4) were dose to chemical equilibrium at 25 s and 600 degrees C. These results indicate that the F2O3/SiO2 Al2O3 catalyst is a promising fluidizable catalyst for tar reduction. This novel supported metal oxide catalyst has a great potential for industrial use since it is a relatively cheap, less toxic, and long-lasting operation.