Effect of Fe on the Selective Catalytic Reduction of NO by NH3 at Low Temperature over Mn/CeO2-TiO2 Catalyst

doi:10.3724/SP.J.1077.2012.00495

Abstract

Abstract:

The Mn/CeO₂-TiO₂ catalyst was prepared using manganese oxide as active component, CeO₂-TiO₂ as support. Effect of the addition of Fe on the performance of NH₃-SCR over Mn/CeO₂-TiO₂ at low temperature was investigated. These catalysts were characterized by BET surface area, H₂ temperature programmed reduction (H₂-TPR) and X-ray photoelectron spectroscope (XPS). The activity result shows that the SCR performance of Mn/CeO₂-TiO₂ is obviously enhanced by the introduction of Fe. The Mn-Fe/CeO₂-TiO₂ catalyst shows high NO conversion within a wide temperature range of 113-250℃. The characterization results show that the introduction of Fe promotes the dispersion of manganese species on the surface of CeO₂-TiO₂, and the reduction temperature of manganese species shifts to lower temperature. The XPS analysis indicates that the valence of surface Mn on Mn-Fe/CeO₂-TiO₂ is +4, while the Fe mainly exists as +3 of Fe₂O₃, and the strong interaction happens between the Fe and the support.

Key words: iron, selective catalytic reduction (SCR), nitrogen oxides, manganese

CLC Number:

O643

WU Da-Wang, ZHANG Qiu-Lin, LIN Tao, GONG Mao-Chu, CHEN Yao-Qiang. Effect of Fe on the Selective Catalytic Reduction of NO by NH₃ at Low Temperature over Mn/CeO₂-TiO₂ Catalyst[J]. Journal of Inorganic Materials, 2012, 27(5): 495-500.

Figures/Tables 7

References 20

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Catalyst	Temperature and areas of every peak					Total areas
Catalyst	T-1	T-2	T-3	T-4	T-5	Total areas
Mn-CT	331℃	445℃	487℃	-	-	7589
Mn-CT	888	4116	2595	-	-	7589
Fe-CT	-	450℃	-	609℃	641℃	7046
Fe-CT	-	1825	-	3361	1860	7046
Mn-Fe-CT	308℃	418℃	476℃	508℃	623℃	9006
Mn-Fe-CT	559	3156	2777	1759	755	9006

Catalyst	Temperature and areas of every peak					Total areas
Catalyst	T-1	T-2	T-3	T-4	T-5	Total areas
Mn-CT	331℃	445℃	487℃	-	-	7589
Mn-CT	888	4116	2595	-	-	7589
Fe-CT	-	450℃	-	609℃	641℃	7046
Fe-CT	-	1825	-	3361	1860	7046
Mn-Fe-CT	308℃	418℃	476℃	508℃	623℃	9006
Mn-Fe-CT	559	3156	2777	1759	755	9006

Sample	Mn2p_3/2 /eV	Fe2p_3/2/eV	Ce3d_5/2/eV
Mn-CT	642.3±0.1	-	882.6±0.1
Fe-CT	-	711.6±0.1	882.8±0.1
Mn-Fe-CT	642.4±0.1	711.5±0.1	882.4±0.1

Sample	Mn2p_3/2 /eV	Fe2p_3/2/eV	Ce3d_5/2/eV
Mn-CT	642.3±0.1	-	882.6±0.1
Fe-CT	-	711.6±0.1	882.8±0.1
Mn-Fe-CT	642.4±0.1	711.5±0.1	882.4±0.1

Sample	Specific surface area /(m²·g^-1)	Pore volume /(mL·g^-1)	Mn content /mol%
CT	116	0.29	-
Mn-CT	35.2	0.09	4.9
Fe-CT	56.7	0.11	-
Mn-Fe-CT	36.7	0.08	4.7

Effect of Fe on the Selective Catalytic Reduction of NO by NH₃ at Low Temperature over Mn/CeO₂-TiO₂ Catalyst

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