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This paper presents a one-step method that significantly simplifies the biomass carbonization preparation with Fe 0  as active catalyst. The catalyst activity was compared to that of the catalyst prepared by a two-step method using a fixed-bed reactor for NO removal. The effects of temperature on catalyst preparation and that of SO 2  on catalyst activity were also studied. The active species and surface structures of the catalysts were determined using X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis-mass spectrometry (TGA-MS), and CO temperature-programmed reduction (CO-TPR), respectively. Fe 0  and Fe 3 C were the active catalytic species during NO removal. The catalysts prepared by the one-step method had a higher NO removal ability than that of the catalyst prepared by the two-step method. This was attributed to the small particle sizes of Fe 0  and Fe 3 C as well as their high selectivity and anti-sintering characteristics. The catalyst prepared at 800°C exhibited the highest catalytic activity because of the special morphology. Catalyst deactivation was caused by oxidation of low-valence iron to Fe 3 O 4  by NO, which was accompanied by agglomeration and sintering. Low SO 2  concentrations affected the catalyst activity during NO removal.

Preparation and Evaluation of Iron-Based Catalysts from Corncob for NO Reduction