Effect of Vanadium Modification on the Activity and Alkali Resistance of Iron-Based de-NOx Catalyst

Abstract

Abstract: The FeV/TiO₂ catalyst was prepared by introducing V species to modify the iron-based catalyst, and the structures and performances were compared with the unmodified catalyst. The catalysts were characterized by means of XRD, Raman, BET, UV-Vis-NIR, NH₃-TPD and H₂-TPR. The results show that FeVO₄ exists as the main phase in the catalyst after introducing V, and there were abundant acid sites to guarantee strong surface acidity. The strong interaction between Fe and V species also greatly enhance the redox ability. Therefore, the low-temperature activity is significantly improved and the temperature window is greatly widened. Moreover, the structure of the catalyst is hardly affected by alkali poisoning, and the catalyst could still maintain strong surface acidity after poisoning, resulting in good resistance to alkali metals.

Key words: iron-based catalyst, vanadium modification, low-temperature activity, resistance to alkali, surface acidity, strong interaction between metal

CLC Number:

TQ426

LI Yue, JIANG Hong, CAI Sixiang. Effect of Vanadium Modification on the Activity and Alkali Resistance of Iron-Based de-NO_x Catalyst[J]. Journal of Synthetic Crystals, 2021, 50(8): 1511-1517.

References

[1] 姚焯,曲殿利,郭玉香,等.一步合成法制备双金属有机骨架材料及其低温选择性脱硝催化性能[J].人工晶体学报,2019,48(4):682-686+692.
YAO Z, QU D L, GUO Y X, et al. Bimetal MOFs synthesized by one-step synthesize method and its catalytic performance for low-temperature selective catalytic reduction[J]. Journal of Synthetic Crystals, 2019, 48(4): 682-686+692(in Chinese).
[2] 刘纳,何峰,谢峻林,等.Fe掺杂Mn/TiO₂低温脱硝催化剂的催化性能研究[J].人工晶体学报,2017,46(3):490-494+500.
LIU N, HE F, XIE J L, et al. Catalytic performance of Fe-doped Mn/TiO₂ catalysts for low-temperature denitration[J]. Journal of Synthetic Crystals, 2017, 46(3): 490-494+500(in Chinese).
[3] HAN L, CAI S, GAO M, et al. Selective catalytic reduction of NO_x with NH₃ by using novel catalysts: state of the art and future prospects[J]. Chemical Reviews, 2019, 119(19): 10916-10976.
[4] HAN L P, GAO M, FENG C, et al. Fe₂O₃-CeO₂@Al₂O₃ nanoarrays on Al-mesh as SO₂-tolerant monolith catalysts for NO_x reduction by NH₃[J]. Environmental Science & Technology, 2019, 53(10): 5946-5956.
[5] LIU J, MEEPRASERT J, NAMUANGRUK S, et al. Facet-activity relationship of TiO₂ in Fe₂O₃/TiO₂ nanocatalysts for selective catalytic reduction of NO with NH₃: in situ DRIFTs and DFT studies[J]. The Journal of Physical Chemistry C, 2017, 121(9): 4970-4979.
[6] YANG S J, LIU C X, CHANG H Z, et al. Improvement of the activity of γ-Fe₂O₃ for the selective catalytic reduction of NO with NH₃ at high temperatures: no reduction versus NH₃ oxidization[J]. Industrial & Engineering Chemistry Research, 2013, 52(16): 5601-5610.
[7] MOU X L, ZHANG B S, LI Y, et al. Rod-shaped Fe₂O₃ as an efficient catalyst for the selective reduction of nitrogen oxide by ammonia[J]. Angewandte Chemie International Edition, 2012, 51(12): 2989-2993.
[8] QU W Y, CHEN Y X, HUANG Z W, et al. Active tetrahedral iron sites of γ-Fe₂O₃ catalyzing NO reduction by NH₃[J]. Environmental Science & Technology Letters, 2017, 4(6): 246-250.
[9] YANG S J, WANG C Z, CHEN J H, et al. A novel magnetic Fe-Ti-V spinel catalyst for the selective catalytic reduction of NO with NH₃ in a broad temperature range[J]. Catalysis Science & Technology, 2012, 2(5): 915.
[10] ZHANG P, LI D Y. Selective catalytic reduction of NO with NH₃ over iron-vanadium mixed oxide catalyst[J]. Catalysis Letters, 2014, 144(5): 959-963.
[11] MU J C, LI X Y, SUN W B, et al. Inductive effect boosting catalytic performance of advanced Fe_1-xV_xO_δ catalysts in low-temperature NH₃ selective catalytic reduction: insight into the structure, interaction, and mechanisms[J]. ACS Catalysis, 2018, 8(8): 6760-6774.
[12] ZHAO W, DOU S P, ZHANG K, et al. Promotion effect of S and N co-addition on the catalytic performance of V₂O₅/TiO₂ for NH₃-SCR of NO_X[J]. Chemical Engineering Journal, 2019, 364: 401-409.
[13] LIU F D, HE H, LIAN Z H, et al. Highly dispersed iron vanadate catalyst supported on TiO₂ for the selective catalytic reduction of NO_x with NH₃[J]. Journal of Catalysis, 2013, 307: 340-351.
[14] OLSEN B K, KÜGLER F, CASTELLINO F, et al. Poisoning of vanadia based SCR catalysts by potassium: influence of catalyst composition and potassium mobility[J]. Catalysis Science & Technology, 2016, 6(7): 2249-2260.
[15] CAI S X, XU T Y, WANG P L, et al. Self-protected CeO₂-SnO₂@SO₄^2-/TiO₂ catalysts with extraordinary resistance to alkali and heavy metals for NO_x reduction[J]. Environmental Science & Technology, 2020, 54(19): 12752-12760.
[16] PENG Y, LI J, CHEN L, et al. Alkali metal poisoning of a CeO₂-WO₃ catalyst used in the selective catalytic reduction of NO_x with NH₃: an experimental and theoretical study[J]. Environmental Science & Technology, 2012, 46(5): 2864-2869.
[17] PENG Y, LI J H, HUANG X, et al. Deactivation mechanism of potassium on the V₂O₅/CeO₂ catalysts for SCR reaction: acidity, reducibility and adsorbed-NO_x[J]. Environmental Science & Technology, 2014, 48(8): 4515-4520.
[18] NUGUID R J G, FERRI D, MARBERGER A, et al. Modulated excitation Raman spectroscopy of V₂O₅/TiO₂: mechanistic insights into the selective catalytic reduction of NO with NH₃[J]. ACS Catalysis, 2019, 9(8): 6814-6820.
[19] ROUTRAY K, ZHOU W, KIELY C J, et al. Catalysis science of methanol oxidation over iron vanadate catalysts: nature of the catalytic active sites[J]. ACS Catalysis, 2011, 1(1): 54-66.
[20] REDDY B M, KHAN A, YAMADA Y, et al. Structural characterization of CeO₂-TiO₂ and V₂O₅/CeO₂-TiO₂ catalysts by Raman and XPS techniques[J]. The Journal of Physical Chemistry B, 2003, 107(22): 5162-5167.
[21] NAGARAJU P, SRILAKSHMI C, PASHA N, et al. Effect of P/Fe ratio on the structure and ammoxidation functionality of Fe-P-O catalysts[J]. Applied Catalysis A: General, 2008, 334(1/2): 10-19.
[22] SANTHOSH KUMAR M, SCHWIDDER M, GRÜNERT W, et al. Selective reduction of NO with Fe-ZSM-5 catalysts of low Fe content: part Ⅱ. Assessing the function of different Fe sites by spectroscopic in situ studies[J]. Journal of Catalysis, 2006, 239(1): 173-186.
[23] ZHOU, G, MAITARAD P, WANG P, et al. Alkali-resistant NO_x reduction over SCR catalysts via boosting NH₃ adsorption rates by in-situ constructing the sacrificed sites[J]. Environmental Science & Technology, 2020, 54(20): 13314-13321.
[24] LIU F, HE H. Structure-activity relationship of iron titanate catalysts in the selective catalytic reduction of NO_x with NH₃[J]. Journal of Physical. Chemistry C, 2010, 114: 16929-16936.
[25] WU G X, LI J, FANG Z T, et al. FeVO₄ nanorods supported TiO₂ as a superior catalyst for NH₃-SCR reaction in a broad temperature range[J]. Catalysis Communications, 2015, 64: 75-79.
[26] DONG G J, ZHANG Y F, ZHAO Y, et al. Effect of the pH value of precursor solution on the catalytic performance of V₂O₅-WO₃/TiO₂ in the low temperature NH₃-SCR of NO_x[J]. Journal of Fuel Chemistry and Technology, 2014, 42(12): 1455-1463.

Effect of Vanadium Modification on the Activity and Alkali Resistance of Iron-Based de-NO_x Catalyst

PDF (PC)

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 2

Recommended Articles

Metrics

Comments

[1]	HU Fangfang, LI Shun, CAI Sixiang, JIANG Hong, MA Yanping. Alkali Resistance of Iron Vanadium Based Oxides by SAPO-34 [J]. JOURNAL OF SYNTHETIC CRYSTALS, 2022, 51(3): 493-501.
[2]	. Study on Correlation between Synthetic Quality of Diamond Single Crystals and the Microstructure of Solvent Metal [J]. JOURNAL OF SYNTHETIC CRYSTALS, 2010, 39(1): 82-87.