钇掺杂三氧化二铁催化剂的脱硝性能研究

doi:10.19964/j.issn.1006-4990.2022-0090

摘要/Abstract

摘要：

为提升三氧化二铁（Fe₂O₃）催化剂的脱硝性能，扩展催化剂的活性温度窗口，采用共沉淀法引入助剂钇（Y）元素对Fe₂O₃催化剂进行改性。通过X射线衍射（XRD）、氮气等温吸-脱附（N₂-BET）、X射线光电子能谱（XPS）、氨气程序升温脱附（NH₃-TPD）、氢气程序升温还原（H₂-TPR）等表征方法对样品进行了表征分析。XRD和N₂-BET结果表明，Y的掺杂使催化剂结构发生变化，比表面积增加、孔径减小。XPS和NH₃-TPD结果证明，Y掺杂Fe₂O₃具有更多的表面吸附氧（O_Ⅰ）、Fe²⁺以及更多的酸量。H₂-TPR结果表明，Y的掺杂使催化剂的氧化还原能力略有下降。测试了不同含量Y掺杂的Fe₂O₃催化剂在150~400 ℃的脱硝性能，其中Fe₉Y₁O _x 催化剂的脱硝活性最佳，在300 ℃达到81.8%。

关键词: 钇, 脱硝催化剂, 三氧化二铁

Abstract:

In order to improve the denitration performance of Fe₂O₃ catalyst and expand the active temperature window of the catalyst，the co-precipitation method was used to introduce the promoter Y to modify the Fe₂O₃ catalyst.The samples were characterized by X-ray diffraction（XRD），N₂ isothermal adsorption desorption（N₂-BET），X-ray photoelectron spectroscopy（XPS），NH₃ temperature programmed desorption（NH₃-TPD） and H₂ temperature programmed reduction（H₂-TPR）.The XRD and N₂-BET results showed that doping of Y changed the catalyst structure，increased the specific surface area and reduced pore size of the catalyst.The XPS and NH₃-TPD demonstrated that Y-doped Fe₂O₃had more surface adsorbed oxygen（O_I），Fe²⁺ and more acid amount.The H₂-TPR results showed that Y doping slightly reduced the redox ability of the catalyst.The denitration performance of Fe₂O₃ catalysts doped with different contents of Y at 150~400 ℃ was tested.Fe₉Y₁O _x catalyst had the best denitration activity，reaching 81.8% at 300 °C.

Key words: yttrium, denitration catalyst, Fe₂O₃

中图分类号:

O643.3

杜沛佞,罗仕忠,谭仁俊,敬方梨. 钇掺杂三氧化二铁催化剂的脱硝性能研究[J]. 无机盐工业, 2022, 54(11): 137-142.

DU Peining,LUO Shizhong,Tan Renjun,JING Fangli. Study on denitration performance of Y doped Fe₂O₃ catalyst[J]. Inorganic Chemicals Industry, 2022, 54(11): 137-142.

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参考文献 19

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样品	BET比表面积/ （m²·g^-1）	孔容/ （cm³·g^-1）	平均孔径/ nm
Fe₂O₃	18.4	0.12	26.3
Y₁Fe₁₅O _x	49.9	0.15	12.1
Y₁Fe₉O _x	115.4	0.14	4.8
Y₁Fe₅O _x	110.0	0.13	4.8

样品	NH₃含量/（mmol·g^-1）
样品	Peak1	Peak2	Peak3	总含量
Fe₂O₃	0.008	0.008	0.008	0.024
Y₁Fe₁₅O _x	0.020	0.047	—	0.067
Y₁Fe₉O _x	0.023	0.100	—	0.123
Y₁Fe₅O _x	0.025	0.090	—	0.115

样品	n（O_Ⅰ）/n（O_Ⅱ）/n（O_Ⅲ）	n（Fe²⁺）/n（Fe³⁺）
Fe₂O₃	14.0/78.5/7.6	58.0/42
Y₁Fe₁₅O _x	24.4/66.9/8.7	56.0/44
Y₁Fe₉O _x	30.2/63.6/6.2	62.8/37.2
Y₁Fe₅O _x	27.1/65/7.9	50.6/49.4

样品	H₂ 消耗量/（mmol·g^-1）			总量/ （mmol·g^-1）
样品	100~510 ℃	510~680 ℃	680~800 ℃	总量/ （mmol·g^-1）
Fe₂O₃	2.9	13.4	5.2	21.5
Y₁Fe₁₅O _x	9.5	7.8	2.3	19.6
Y₁Fe₉O _x	5.9	4.7	5.1	15.7
Y₁Fe₅O _x	3.5	6.6	1.0	11.1

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