Abstract

Marzieh Hamidzadeh^1,2, Mitra Ghassemzadeh^1*,Aliakbar Tarlani¹ and Saeed Sahebdel Far¹

DOI : http://dx.doi.org/10.13005/ojc/320155

Selective catalytic reduction of nitrogenoxide with ammonia in the presence of excessive oxygen was investigated on transition metal oxides’catalysts(V, Cr, Mn, Fe)supported on HZSM-5. Meanwhile,catalyst V/ZSM-5 and Fe/ZSM-5 have shown the most activity and the conversion percentage of nitrogen oxidestonitrogenis more than 97% at temperatures above300°C, in these two catalysts. All synthesized catalysts possessed a good stability. Analytical characterization of synthesized catalysts were conducted by different methods of temperature programmed reduction, absorption and desorption of nitrogen, temperature programmed desorption of ammonia, X-ray diffraction and diffuse reflectance UV-vis spectroscopy. The less the apparentactivation energy is, the more their activity will be. Thus, the Cr/ZSM-5 and V/ZSM-5 catalysts showed the lowest and highest performance in this process, respectively.

catalyst; Selective catalytic reduction; manganese; vanadium; iron; zeolite

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