Kinetic study on the selective catalytic reduction of NO with NH<sub>3</sub> over iron-cerium mixed oxide

XIONG Zhi-bo; GUO Dong-xu; LU Chun-mei; ZHANG Xin-li

Volume 41 Issue 04

Apr. 2013

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Article Navigation > Journal of Fuel Chemistry and Technology > 2013 > 41(04): 506-512

XIONG Zhi-bo, GUO Dong-xu, LU Chun-mei, ZHANG Xin-li. Kinetic study on the selective catalytic reduction of NO with NH3 over iron-cerium mixed oxide[J]. Journal of Fuel Chemistry and Technology, 2013, 41(04): 506-512.

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XIONG Zhi-bo, GUO Dong-xu, LU Chun-mei, ZHANG Xin-li. Kinetic study on the selective catalytic reduction of NO with NH₃ over iron-cerium mixed oxide[J]. Journal of Fuel Chemistry and Technology, 2013, 41(04): 506-512.

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Kinetic study on the selective catalytic reduction of NO with NH₃ over iron-cerium mixed oxide

1.
School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2.
National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, Shandong University, Jinan 250061, China

Received Date: 2012-11-08
Rev Recd Date: 2013-01-05
Publish Date: 2013-04-30

Abstract

Abstract

Iron-cerium mixed metal oxide (Fe_0.95Ce_0.05O_z) was prepared through co-precipitation method and used as the catalyst in the selective catalytic reduction of NO with NH₃ (NH₃-SCR); the effects of initial concentration of NO, molar ratio of NH₃/NO and O₂ concentration on its NH₃-SCR activity were investigated in an integral reactor at steady-state and the kinetics were considered in a differential reactor. The results indicated that the amount of NO converted over per unit catalyst increases with the initial concentration of NO; with the increase of NH₃/NO mol ratio, NO conversion is firstly increased sharply and then gradually reaches a stable value; O₂ in the flue gas also plays an important role in the NH₃-SCR reaction. The NH₃-SCR reaction over Fe_0.95Ce_0.05O_z exhibits first-order with respect to NO, zero-order to NH₃, and nearly 0.5-order to O₂ at 175~275 ℃; the apparent activation energy is 42.6 kJ/mol.
- iron-cerium mixed oxide catalyst,
- selective catalytic reduction of NO (SCR),
- NO,
- kinetics

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References(16)

References

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