Abstract: The precursor effects of Fe precursors on the selective catalytic reduction of NO_x by NH₃ (NH₃-SCR) over Fe/β catalyst were evaluated. Three different precursors, ferrocene, ferric nitrate, and ferric chloride, were chosen to prepare Fe/β catalyst by liquid impregnation method. The catalyst samples were characterized by X-ray diffraction, N₂ adsorption-desorption, transmission electron microscopy, H₂ temperature-programmed reduction, and NH₃ temperature-programmed desorption. The results showed that the activity of Fe/β from ferrocene was superior to the others. Under the reaction condition of GHSV 60000 h^–1, 50% conversion of NO_x was reached at 150 ^oC and full conversion was obtained at 260 ^oC. Characterization indicated that ferrocene is profitable to improve the particle size, particle distribution, and redox properties of FeO_x species, leading to the NH₃-SCR activity promotion.

Key words: &beta, zeolite, ferrocene, precursor, ammonia, selective catalytic reduction, nitric oxide