A Comparative Study of M/ZSM-5 (M = Pd, Ag, Cu, Ni) Catalysts in the Selective Reduction of Nitrogen (II) Oxide by Ammonia

Authors

  • Marzieh Hamidzadeh  Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran
  • Mitra Ghassemzadeh  Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran
  • Aliakbar Tarlani  Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran
  • Saeed Sahebdel Far  Catalyst Research Group, Petrochemical Research and Technology Company, National Petrochemical Company, Tehran, Iran

Keywords:

ZSM-5; Selective catalytic reduction; Nitrogen oxides; cation effect

Abstract

The improvement of H-ZSM-5 catalyst for NO removal from stack of nitric acid unit was studied in this research. Selective catalytic reduction of NO was investigated on Pd, Ag, Cu and Ni impregnated on ZSM-5 in the presence of excess of oxygen. The new prepared catalysts were characterized by XRD, FTIR, H2-TPR and N2 adsorption-desorption methods. Successively, NOconversion increased with the reaction temperature transmission through a maximum, and then decreased at higher temperatures, because of the combustion of the ammonia on Pd/ ZSM-5and Cu/ ZSM-5 catalysts. The apparent activation energies in NO removal reaction have been determined for the prepared catalysts and it changes from 23 to 48 kJ/mol. In synthesis catalysts, partial dealumination were confirmed by XRD results. The results exhibited that the Cu/ZSM-5 and Pd/ZSM-5 catalysts had acceptable activity between 200 to 400 °C and under 250°C, respectively. It is found that the NOx removal efficiency does not obey from the same pattern by rising temperature in all of these catalysts.

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International Journal of Scientific Research in Science and Technology

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Published

2015-10-25

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Volume 1, Issue 4, September-October-2015

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Research Articles

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How to Cite

[1]
Marzieh Hamidzadeh, Mitra Ghassemzadeh, Aliakbar Tarlani, Saeed Sahebdel Far, " A Comparative Study of M/ZSM-5 (M = Pd, Ag, Cu, Ni) Catalysts in the Selective Reduction of Nitrogen (II) Oxide by Ammonia, International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011, Volume 1, Issue 4, pp.06-11, September-October-2015.