A comprehensive investigation of influences of NO and O2 on N2O-SCR by CH4 over Fe-USY zeolite

Shen, Qun; Li, Landong; He, Chi; Tian, Hua; Hao, Zhengping; Xu, Zhi Ping

doi:10.1016/j.apcatb.2009.05.034

Cited by 16 publications

(15 citation statements)

References 34 publications

(51 reference statements)

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“…16 In the presence of O 2 , no decrease in N 2 O conversion was observed, as shown in Figure 1A. Instead, there was a slight improvement in N 2 O conversion under these conditions.…”

Section: Physical Characterization Of the Fe−mor Zeolitementioning

confidence: 48%

Investigation of Selective Catalytic Reduction of N₂O by NH₃ over an Fe–Mordenite Catalyst: Reaction Mechanism and O₂ Effect

Zhang

Shen

et al. 2012

ACS Catal.

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We systematically investigated the reaction mechanism and effect of O 2 on N 2 O reduction by NH 3 over an Fe−Mordenite (MOR) catalyst. O 2 has no inhibitory effect on N 2 O reduction, and NH 3 selective catalytic reduction (SCR) of N 2 O is superior to NH 3 oxidation by O 2 . We found that the mechanism of NH 3 SCR of N 2 O involves the redox cycle of Fe(III)−OH sites, with Fe(III)−OH reduction by NH 3 as the first and ratedetermining step. Then N 2 O is activated at the reduced Fe(II)−OH sites into NO/N or N 2 /O, reoxidizing the Fe(II)−OH into Fe(III)−OH sites. Next, the NO formed in situ reacts with adsorbed NH 2 to form NH 2 NO, which further decomposes to N 2 and water. In addition, some NO may join with O to form NO 2 , which reacts with NH 4 + to produce NH 4 NO 2 and further decomposes to N 2 and water. It is possible that under the steady state, N−NO breaking accounts for two-thirds of N 2 O splitting. The formation of NO intermediates plays a crucial role in this reaction. The structural arrangement of MOR zeolites and the high content of Fe ions provides two proximal Fe ions, that is, Fe(III)···Fe(III) pairs, as the active sites for this N−NO breaking, resulting in the high activity of Fe−MOR.

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“…16 In the presence of O 2 , no decrease in N 2 O conversion was observed, as shown in Figure 1A. Instead, there was a slight improvement in N 2 O conversion under these conditions.…”

Section: Physical Characterization Of the Fe−mor Zeolitementioning

confidence: 48%

Investigation of Selective Catalytic Reduction of N₂O by NH₃ over an Fe–Mordenite Catalyst: Reaction Mechanism and O₂ Effect

Zhang

Shen

et al. 2012

ACS Catal.

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“…Although various zeolite catalysts have high performance for CH 4 -SCR of NO x [1][2][3][4][5][6], they are hydrothermally unstable; their frameworks are destroyed by exposure to high temperature steam [7]. Therefore, the development of active oxide-type catalysts with higher hydrothermal stability is necessary because the water content in the exhaust gases from stationary combustion plants is high.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various strategies for removing NO x from exhaust gases, selective catalytic reduction (SCR) using CH 4 as a reductant is especially attractive in thermal power plants, because CH 4 is the main component of natural gas, which is used as fuel in thermal power plants. Moreover, unreacted CH 4 can be easily removed by catalytic combustion after the SCR procedure.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of the Activities of γ-Ga2O3–Al2O3 Catalysts for Methane-SCR of NO by Treatment with NH3

et al. 2011

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The precursor particles for c-Ga 2 O 3 -Al 2 O 3 solid solutions were prepared by the coprecipitation method from aqueous solutions of Ga(NO 3 ) 3 and Al(NO 3 ) 3 with (NH 4 ) 2 CO 3 as a precipitant. The c-Ga 2 O 3 -Al 2 O 3 solid solutions were obtained by calcination of the precursor at 700°C. In this paper, the performance of the catalysts treated with NH 3 was investigated for the selective catalytic reduction (SCR) of NO with methane as a reducing agent, and it was found that c-Ga 2 O 3 -Al 2 O 3 catalysts treated with NH 3 and subsequently annealed in air showed higher activities than the c-Ga 2 O 3 -Al 2 O 3 catalysts without NH 3 treatment. NH 3 treatment of the catalyst caused partial rearrangement of Ga 3? and Al 3? ions and increased the population of tetrahedral Ga 3? ions in the defective spinel structure.

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“…Choosing the temperature range of 22-550 °C, with the effect of Fe-USY zeolite catalyst, and using selective catalytic reduction (SCR) method, Shen and co-workers [15] 4 system was much higher than that in other systems.…”

Section: Open Accessmentioning

confidence: 99%

Experimental Research on Heterogeneous N2O Decomposition with Ash and Biomass Gasification Gas

Zhang

Yang

et al. 2011

Energies

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Abstract:In this paper, the promoting effects of ash and biomass gas reburning on N 2 O decomposition were investigated based on a fluidized bed reactor, with the assessment of the influence of O 2 on N 2 O decomposition with circulating ashes. Experimental results show that different metal oxides contained in ash play distinct roles in the process of N 2 O decomposition with biomass gas reburning. Compared with other components in ash, CaO is proven to be very active and has the greatest promoting impact on N 2 O decomposition. It is also found that O 2 , even in small amounts, can weaken the promoting effect of ash on N 2 O decomposition by using biomass gas reburning.

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A comprehensive investigation of influences of NO and O2 on N2O-SCR by CH4 over Fe-USY zeolite

Cited by 16 publications

References 34 publications

Investigation of Selective Catalytic Reduction of N₂O by NH₃ over an Fe–Mordenite Catalyst: Reaction Mechanism and O₂ Effect

Investigation of Selective Catalytic Reduction of N₂O by NH₃ over an Fe–Mordenite Catalyst: Reaction Mechanism and O₂ Effect

Enhancement of the Activities of γ-Ga2O3–Al2O3 Catalysts for Methane-SCR of NO by Treatment with NH3

Experimental Research on Heterogeneous N2O Decomposition with Ash and Biomass Gasification Gas

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A comprehensive investigation of influences of NO and O2 on N2O-SCR by CH4 over Fe-USY zeolite

Cited by 16 publications

References 34 publications

Investigation of Selective Catalytic Reduction of N2O by NH3 over an Fe–Mordenite Catalyst: Reaction Mechanism and O2 Effect

Investigation of Selective Catalytic Reduction of N2O by NH3 over an Fe–Mordenite Catalyst: Reaction Mechanism and O2 Effect

Enhancement of the Activities of γ-Ga2O3–Al2O3 Catalysts for Methane-SCR of NO by Treatment with NH3

Experimental Research on Heterogeneous N2O Decomposition with Ash and Biomass Gasification Gas

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Investigation of Selective Catalytic Reduction of N₂O by NH₃ over an Fe–Mordenite Catalyst: Reaction Mechanism and O₂ Effect

Investigation of Selective Catalytic Reduction of N₂O by NH₃ over an Fe–Mordenite Catalyst: Reaction Mechanism and O₂ Effect