钕改性铁基催化剂用于氮氧化物脱除

doi:10.19964/j.issn.1006-4990.2022-0366

Abstract

Abstract:

Metal Fe and Nd were introduced into the surface of commercial TiO₂ by stepwise impregnation to study its denitrification performance.The samples were characterized by X-ray diffraction（XRD），nitrogen adsorption-desorption（N₂-BET），X-ray photoelectron spectroscopy（XPS），ammonia temperature-programmed desorption（NH₃-TPD），hydrogen temperature-programmed reduction（H₂-TPR）.The adsorption and desorption of N₂ showed that the introduction of Nd reduced the specific surface area of the catalysts loaded with Fe.X-ray diffraction analysis showed that the introduced metal species had good dispersion on the catalyst surface.The results of NH₃-TPD test showed that the introduction of Nd increased the total acid content of the catalyst and changed the acid distribution of the catalyst.XPS results showed that Nd modification increased the content of oxygen and Fe²⁺ on the surface of the catalyst，which was beneficial to the denitrification reaction.H₂-TPR test showed that the introduction of Nd reduced the redox performance of the catalyst slightly.The results of activity test showed that appropriate Nd loading was beneficial to improve the denitrification performance of the catalyst.When the mass fraction of Nd element in the catalyst was 9%，the catalyst had the best denitrification efficiency of 81.4%.

Key words: selective catalytic reduction, supported catalyst, neodymium, Fe-based catalyst

CLC Number:

O643.3

LI Peng, YANG Siyuan, LUO Shizhong, DU Peining, TAN Renjun, JING Fangli. Neodymium-modified iron-based catalysts for nitrogen oxides removal[J]. Inorganic Chemicals Industry, 2023, 55(3): 140-146.

Figures/Tables 13

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References 13

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催化剂	D_A/nm	D_B/nm
TiO₂	50.1	51.8
Fe-TiO₂	58.3	59.1
1.8%Nd-Fe/TiO₂	58.9	47.4
9%Nd-Fe/TiO₂	61.2	52.3
18%Nd-Fe/TiO₂	55.8	54.5

催化剂	S_BET/（m²·g^-1）	V_P/（cm³·g^-1）	D_BJH/nm
TiO₂	12.2	0.05	15.9
Fe-TiO₂	22.5	0.11	18.7
1.8%Nd-Fe/TiO₂	20.8	0.10	19.7
9%Nd-Fe/TiO₂	15.6	0.08	20.4
18%Nd-Fe/TiO₂	14.3	0.07	19.3

催化剂	NH₃脱附量/（mmol·g^-1）
催化剂	150~300 ℃	300~600 ℃	600~800 ℃	总计
TiO₂	0.006	0.003	—	0.009
Fe-TiO₂	—	0.009	—	0.009
1.8%Nd-Fe/TiO₂	—	0.025	—	0.025
9%Nd-Fe/TiO₂	0.010	0.019	0.006	0.035
18%Nd-Fe/TiO₂	0.009	0.045	0.016	0.070

催化剂	n（Fe²⁺）/n（Fe³⁺）	n（O_Ⅰ）/n（O_Ⅱ）/n（O_Ⅲ）
Fe-TiO₂	69.5/30.5	19.2/77.3/3.5
1.8%Nd-Fe/ TiO₂	76.0/24.0	19.3/73.2/7.5
9%Nd-Fe/ TiO₂	79.9/20.1	27.6/63.1/9.3
18%Nd-Fe/ TiO₂	79.5/20.5	25.6/48.8/25.6

催化剂	H₂消耗量/（mmol·g^-1）
催化剂	100~550 ℃	550~800 ℃	总计
Fe-TiO₂	2.42	—	2.42
1.8%Nd-Fe/ TiO₂	1.49	1.68	3.17
9%Nd-Fe/ TiO₂	0.50	2.54	3.04
18%Nd-Fe/ TiO₂	1.52	1.49	3.01

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Neodymium-modified iron-based catalysts for nitrogen oxides removal

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