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科学通报  2014 

商用SCR脱硝催化剂(V2O5-WO3/TiO2)碱金属中毒及再生

DOI: 10.1360/csb2014-59-26-2560, PP. 2560-2566

Keywords: 选择性催化,还原脱硝,商用钒钛系,催化剂,碱金属,失活,再生

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Abstract:

实验室模拟商用钒钛系脱硝催化剂的氧化钠和氧化钾中毒,并通过水洗、稀硫酸洗及超声波辅助等方法进行再生.采用NH3程序升温脱附(NH3-TPD)和X射线光电子能谱(XPS)方法对催化剂失活原因进行了研究与分析.活性测试结果表明,Na2O对催化剂的中毒效应比K2O强,但催化剂K2O中毒后的再生难度较大.NH3-TPD结果表明,催化剂表面酸性位的降低导致氨吸附量的减少是催化剂活性下降的原因之一.XPS结果显示,Na2O引起催化剂表面活性氧含量的严重降低和K2O引起催化剂O1s结合能的明显偏移与宽化可能是造成K2O对催化剂的中毒效应比Na2O弱但再生难度较大的主要原因.另外,通过酸洗再生可引起催化剂表面硫酸化,增加了酸性活性位,从而促进催化剂的脱硝性能.

References

[1]  1 Wan Y P, Zhao W R, Tang Y, et al. Ni-Mn bi-metal oxide catalysts for the low temperature SCR removal of NO with NH3. Appl Catal B, 2014, 148-149: 114-122
[2]  2 Forzatti P. Present status and perspectives in de-NOx SCR catalysis. Appl Catal A, 2001, 222: 221-236
[3]  3 Roy S, Hegde M S, Madras G. Catalysis for NOx abatement. Appl Energy, 2009, 86: 2283-2297
[4]  5 Shang X S, Hu G R, He C, et al. Regeneration of full-scale commercial honeycomb monolith catalyst (V2O5-WO3/TiO2) used in coal-fired power plant. J Ind Eng Chem, 2012, 18: 513-519
[5]  6 Chen Z H, Yang Q, Li H, et al. Cr-MnOx mixed-oxide catalysts for selective catalytic reduction of NOx with NH3 at low temperature. J Catal, 2010, 276: 56-65
[6]  7 Yu Y K, He C, Chen J S, et al. Deactivation mechanism of de-NOx catalyst (V2O5-WO3/TiO2) used in coal fired power plant. J Fuel Chem Technol 2012, 40: 1359-1365
[7]  8 Castellino F, Rasmussen S B, Jensen A D, et al. Deactivation of vanadia-based commercial SCR catalysts by polyphosphoric acids. Appl Catal B, 2008, 83: 110-122
[8]  12 Benson S A, Laumb J D, Crocker C R, et al. SCR catalyst performance in flue gases derived from subbituminous and lignite coals. Fuel Process Technol, 2005, 86: 577-613
[9]  14 Larsson A C, Einvall J, Andersson A, et al. Targeting by comparison with laboratory experiments the SCR catalyst deactivation process by potassium and zinc salts in a large-scale biomass combustion boiler. Energy Fuels, 2006, 20: 1398-1405
[10]  15 Lietti L, Forzatti P, Ramis G, et al. Potassium doping of vanadia/titania de-NOxing catalysts: Surface characterisation and reactivity study. Appl Catal B, 1993, 3: 13-35
[11]  16 Kamata H, Takahashi K, Odenbrand C U I. The Role of K2O in the selective reduction of NO with NH3 over a V2O5-WO3/TiO2 commercial selective catalytic reduction catalyst. J Mol Catal A, 1999, 139: 189-198
[12]  18 Tang F S, Xu B L, Shi H H, et al. The poisoning effect of Na+ and Ca2+ ions doped on the V2O5/TiO2 catalysts for selective catalytic reduction of NO by NH3. Appl Catal B, 2010, 94: 71-76
[13]  19 Zheng Y J, Jensen A D, Johnsson J E. Laboratory investigation of selective catalytic reduction catalysts: Deactivation by potassium compounds and catalyst generation. Ind Eng Chem Res, 2004, 43: 941-947
[14]  20 Zheng Y J, Jensen A D, Johnsson J E, et al. Deactivation of V2O5-WO3/TiO2 SCR catalyst at biomass fired power plants: Elucidation of mechanisms by lab- and pilot-scale experiments. Appl Catal B, 2008, 83: 186-194
[15]  21 Khodayari R, Ingemar C U O. Regeneration of commercial SCR catalysts by washing and sulphation: Effect of sulphate groups on the activity. Appl Catal B, 2001, 33: 277-291
[16]  27 Kustov A L, Kustova M Y. Vanadia on sulphated-ZrO2, a promising catalyst for NO abatement with ammonia alkali containing flue gases. Appl Catal, 2005, 58: 97-104
[17]  4 Hao J M, Tian H Z, Lu Y Q. Emission inventories of NOx from commercial energy consumption in China, 1995-1998. Environ Sci Technol, 2002, 36: 552-560
[18]  9 Zheng Y J, Jensen A D, Johnsson J E. Deactivation of V2O5-WO3/TiO2 SCR catalyst at abiomass-fired combined heat and power plant. Appl Catal B, 2005, 60: 253-264
[19]  10 Chen L, Li J H, Ge M F. The poisoning effect of alkali metals doping over nano V2O5-WO3/TiO2 catalysts on selective catalytic reduction of NOx by NH3. Chem Eng J, 2011, 170: 531-537
[20]  11 Francesco C, Anker D J, Jan E J, et al. Influence of reaction products of K-getter fuel additives on commercial vanadia-based SCR catalysts, Part I. Potassium phosphate. Appl Catal B, 2009, 86: 196-205
[21]  13 Chen J P, Yang R T. Mechanism of poisoning of the V2O5/TiO2 catalyst for the reduction of NO by NH3. J Catal, 1990, 125: 411-420
[22]  17 Lisi L, Lasorella G, Malloggi S, et al. Single and combined deactivating effect of alkali metals and HCl on commercial SCR catalysts. Appl Catal B, 2004, 50: 251-258
[23]  22 Jorgensen T C, Weatherley L R. Ammonia removal from wastewater by ion exchange in the presence of organic contaminants. Water Res, 2003, 37: 1723-1728
[24]  23 Correia R N, Magalaes M C F, Marques P A A P, et al. Wet synthesis and characterization of modified hydroxyapatite powders. J Mater Sci, 1996, 7: 501-505
[25]  24 Wang J H. Tracer-diffusion in liquids. I. Diffusion of tracer amount of sodium ion in aqueous potassium chloride solutions. J Am Chem Soc, 1952, 74: 1182-1186
[26]  25 Tops?e N Y, Dumesic J A, Tops?e H. Vanadia-titania catalysts for selective catalytic reduction of nitric-oxide by ammonia:Ⅱ. Studies of active sites and formulation of catalytic cycles. J Catal, 1995, 151: 241-252
[27]  26 Si-Ahmed H, Calatayud M, Minot C, et al. Combining theoretical description with experimental in situ studies on the effect of potassium on the structure and reactivity of titania-supported vanadium oxide catalyst. Catal Today, 2007, 126: 96-102
[28]  28 Chen J P, Yang R T. Selective catalytic reduction of NO with NH3 on SO42-/TiO2 superacid catalyst. J Catal, 1993, 139: 277-288
[29]  29 Busca G, Lietti L, Ramis G, et al. Chemical and mechanistic aspects of the selective catalytic reduction of NOx by ammonia over oxide catalysts: A review. Appl Catal B, 1998, 18: 1-36
[30]  30 Qi G, Yang R T. Characterization and FTIR studies of MnOx-CeO2 catalyst for low-temperature selective catalytic reduction of NO with NH3. J Phys Chem B, 2004, 108: 15738-15747
[31]  31 Reiche M A, Maciejewski M, Baiker A. Characterization by temperature programmed reduction. Catal Today, 2000, 56: 347-355
[32]  32 Kang M, Park E D, Kim J M, et al. Manganese oxide catalysts for NOx reduction with NH3 at low temperatures. Appl Catal A, 2007, 327: 261-269

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