A Comparative Study of the Selective Oxidation of NH₃ to N₂ over Transition Metal Catalysts

Abstract:

Cu-Mn/Al₂O₃, Cu-Mn/TiO₂ and Cu-Mn/SBA-15 were prepared by incipient wetness impregnation. The activity of those catalysts for selective catalytic oxidation (SCO) of ammonia to nitrogen at low temperature (100°C~250°C) is not so satisfying. 5%Cu-5%Zr/TiO₂ has the highest NH₃ conversion and highest NO, NO₂ yield. 5%Cu-5%Mn/Al₂O₃ is a promising NH₃ selective catalytic oxidation catalyst, but still needs further study. SBA-15 is a bad support for Cu-Mn. Al₂O₃-based catalysts and TiO₂-based catalysts were also prepared by incipient wetness impregnation to sure the synergistic effect between transition metal. The results find the activity on Cu-Mn/Al₂O₃ is better than Cu-Mn/TiO₂, but NH₃ conversion on Cu-Zr/TiO₂ is rather well with high yield of NO. The role of supports and transition metals play in catalyst are discussed by a series of experiments. Key ward: SCO, NH₃, transition metal, γ-Al₂O₃, TiO₂, SBA-15

• Periodical: Advanced Materials Research (Volumes 798-799)
• Pages: 239-244
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.798-799.239
• Online since: September 2013
• Authors: Wen Qin Wang, Xiao Long Tang, Hong Hong Yi, Jing Li Hu
• Keywords: NH₃, SBA-15, Selective Catalytic Oxidation (SCO), TiO₂, Transition Metal, γ-Al₂O₃

References

[1] M D Bermejo, F Cantero, M J Cocero. Supercritical water oxidation of feeds with high ammonia concentrations Pilot plant experimental results and modeling [J], Chemical Engineering Journal, 2008, 137: 42-549.

DOI: 10.1016/j.cej.2007.05.010

[2] M J Lippits, A C Gluhoi, B. E. Nieuwenhuys. A comparative study of the selective oxidation of NH3 to N2 over gold, silver and copper catalysts and the effect of addition of Li2O and CeOx [J]. Catalysis Today, 2008, 137: 446-452.

DOI: 10.1016/j.cattod.2007.11.021

[3] Chen Wen, Zuo Jun, LiuQing Hong. Overview on Removing Organ phosphorus Pesticide of Low Concentration in Wastewater by Photocatalytic Oxidation Technique Modern [J]. Agricultural Sciences, 2008, 4: 1-2.

[4] Lenihan S, Curtin T. The selective oxidation of ammonia using copper-based catalysts: The effects of water [J]. Catalysis Today, 2008, 5814: 1–5.

DOI: 10.1016/j.cattod.2008.06.017

[5] Yusuke D, Hiroki Y, Toshihiro K. Preparation of porous titanium phosphate glass-ceramics for　NH3 gas adsorption with self-cleaning ability [J]. Journal of the European Ceramic Society, 2008, 28, 267–270.

DOI: 10.1016/j.jeurceramsoc.2007.05.016

[6] Canals Batllea C, Rosa A, Lillo-Ro Ma, et al. Carbonaceous adsorbents for NH3 removal at room temperature[J]. Carbon, 2008, 46: 176–178.

DOI: 10.1016/j.carbon.2007.10.017

[7] R Q Long, R T Yang. Selective Catalytic Oxidation (SCO) of Ammonia to Nitrogen over Fe-Exchanged Zeolites[J]. Journal of Catalysis, 2001, 201: 145-152.

DOI: 10.1006/jcat.2001.3234

[8] R. Q. Long, R. T. Yang. Selective Catalytic Oxidation of Ammonia to Nitrogen over Fe2O3-TiO2 Prepared with a Sol–Gel Method [J]. Journal of Catalysis, 2002, 207: 158-165.

DOI: 10.1006/jcat.2002.3545

[9] L I Darvell, K Heiskanen, J M Jones, et al. An investigation of alumina-supported catalysts for the selective catalytic oxidation of ammonia in biomass gasification [J]. Catalysis Today, 2003, 81: 681-692.

DOI: 10.1016/s0920-5861(03)00166-4

[10] Shilong He, Changbin Zhang, Min Yang, et al. Selective catalytic oxidation of ammonia from MAP decomposition [J]. Separation and Purification Technology, 2007, 58: 173-178.

DOI: 10.1016/j.seppur.2007.07.015

[11] Chang-Mao Hung. An investigation of alumina-supported catalysts for the selective catalytic oxidation of ammonia in biomass gasification[J]. Powder Technology, 2010, 200: 78–83.

[12] S Lenihan, T Curtin. The selective oxidation of ammonia using copper-based catalysts: The effects of water[J]. Catalysis Today, 2009, 145: 85–89.

DOI: 10.1016/j.cattod.2008.06.017

[13] Lu Gang, B G Anderson, J van Grondelle, et al. Low temperature selective oxidation of ammonia to nitrogen on silver-based catalysts[J]. Applied Catalysis B: Environmental, 2003, 40: 101-110.

DOI: 10.1016/s0926-3373(02)00129-7

[14] Xiangzhi Cui, Jian Zhou, Zhengqing Ye, et al. Selective catalytic oxidation of ammonia to nitrogen over mesoporous CuO/RuO2 synthesized by co-nanocasting-replication method [J]. Journal of Catalysis, 2010, 270: 310-317.

DOI: 10.1016/j.jcat.2010.01.005