Direct synthesis, characterization and catalytic performance of bimetallic Fe–Mo-SBA-15 materials in selective catalytic reduction of NO with NH 3

Abstract

A series of bimetallic Fe–Mo-SBA-15 materials were synthesized through direct synthetic strategy and comprehensively characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), N 2 sorption, inductively coupled plasma (ICP), thermogravimetry and differential thermal analysis (TG–DTA), Fourier-transform infrared spectroscopy (FT-IR), UV–vis spectroscopy (UV–vis), temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS), in situ NH 3-adsorbed FT-IR (NH 3-IR) and temperature-programmed desorption of NH 3 (NH 3-TPD). The results indicated that: (1) all the samples exhibited typical hexagonal arrangement of mesoporous structure; (2) the incorporation of Fe could efficiently promote the incorporation/dispersion behavior of Mo in SBA-15; (3) the addition of Mo species could enhance the structural ordering of mesoporous materials. Moreover, the prepared materials were evaluated in the selective catalytic reduction (SCR) of NO with NH 3. The results showed that the materials containing Fe and Mo exhibited higher catalytic activity than monometallic modified SBA-15 due to the increased intensity and quantity of surface acidity with the addition of Mo species.