Mn、W掺杂菱铁矿催化剂对柴油机尾气SCR脱硝性能的影响

许夏; 归柯庭

doi:10.13205/j.hjgc.201909023

Mn、W掺杂菱铁矿催化剂对柴油机尾气SCR脱硝性能的影响

doi: 10.13205/j.hjgc.201909023

许夏,
归柯庭

东南大学能源与环境学院

基金项目:

国家自然科学基金(51276039)

江苏省环保科研课题(2015008)

详细信息

作者简介:
许夏(1994-),女,硕士,主要研究方向为SCR脱硝催化剂。632536204@qq.com

通讯作者:
归柯庭(1957-),男,博士,教授,主要研究方向为大气污染控制。101000477@seu.edu

中图分类号: X701
计量
- 文章访问数: 40
- HTML全文浏览量: 12
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2019-01-15
- 网络出版日期: 2023-11-24
- 刊出日期: 2019-09-30

摘要

摘要: 对菱铁矿掺杂Mn、W等过渡金属元素制备催化剂用于柴油机尾气SCR脱硝。500℃煅烧菱铁矿催化剂在30000 h^-1高空速下虽具较高SCR脱硝效率,但活性温度窗口较窄,仅在240~330℃内脱硝效率在90%以上,与柴油机尾气温度(200~400℃)有较大差距,故采用混合搅拌法对菱铁矿催化剂掺杂Mn改性提高其低温活性,掺杂W改性提高其高温活性,从而拓宽活性温度窗口。实验结果表明:单独掺杂3%Mn和3%W时,催化剂温度窗口分别拓宽至180~330℃和240~390℃。同时掺杂Mn和W,掺杂M0. 01W0. 03-菱铁矿催化剂在210~390℃内脱硝效率超过90%,基本符合柴油机尾气排放温度,可适用于柴油机尾气脱硝。运用BET、XRD和NH₃-TPD等方法对催化剂进行表征发现,掺杂后的催化剂比表面积更大、表面结晶更弱、吸附位酸性更强,有利于提高柴油机尾气的SCR脱硝活性。
- SCR脱硝 /
- 菱铁矿 /
- Mn-W共掺杂 /
- 柴油机尾气

HTML全文

参考文献(23)

[1]	Koebel M,Elsener M,Kleemann M. Urea-SCR:a promising technique to reduce NO_xemissions from automotive diesel engines[J]. Catalysis Today,2000,59(3/4):335-345.
[2]	Muckenhuber H,Grothe H. A DRIFTS study of the heterogeneous reaction of NO₂with carbonaceous materials at elevated temperature[J]. Carbon,2007,45:321-329.
[3]	Lapuerta M,Hernandez J J,Gimenez F. Evaluation of exhaust gas recirculation as a technique for reducing diesel engine NO_x emissions[J]. Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering,2000,214(1):85-93.
[4]	Forzatti P. Present status and perspectives in de-NO_xSCR catalysis[J]. Applied Catalysis A General,2001,222(1/2):221-236.
[5]	Praveena V,Martin M L J. A review on various after treatment techniques to reduce NO_xemissions in a CI engine[J]. Journal of the Energy Institute,2017:S1743967117300260.
[6]	佟德辉.降低车用柴油机NO_x排放的SCR技术控制策略研究[D].济南:山东大学,2009.
[7]	Gérard D,Valade D,Ariel Guzmán-V,et al. Selective catalytic reduction of nitric oxide with ammonia on Fe-ZSM-5 catalysts prepared by different methods[J]. Applied Catalysis B Environmental,2005,55(2):149-155.
[8]	廖彦彦.柴油发动机尾气后处理技术(SCR)的应用[J].中国新技术新产品,2017(7):36-37.
[9]	Baidya T,Bernhard A,Elsener M,et al. Hydrothermally stable WO₃/Zr O₂-Ce_{0. 6}Zr_{0. 4}O₂catalyst for the selective catalytic reduction of NO with NH₃[J]. Topics in Catalysis,2013,56(1/2/3/4/5/6/7/8):23-28.
[10]	Li J H,Chang H Z,Ma L,et al. Low-temperature selective catalytic reduction of NO_xwith NH₃over metal oxide and zeolite catalysts:a review[J]. Catalysis Today,2011,175(1):147-156.
[11]	杨斌,周朝兵,陈康.满足国Ⅴ及以上排放标准的柴油机SCR技术[J].价值工程,2017,36(7):98-100.
[12]	孟令军,刘悦锋,赵文辅,等.轻型柴油机SCR反应特性研究[J].内燃机与动力装置,2017,34(3):6-9.
[13]	刘福东,单文坡,石晓燕,等.用于NH₃选择性催化还原NO_x的钒基催化剂[J].化学进展,2012,1(4):445-455.
[14]	Pavan M,Jagtap,Neelam,et al. Magnesia doped Ag/Al₂O₃:sulfur tolerant catalyst for low temperature HC-SCR of NO_x[J].Applied Catalysis B Environmental,2014,144(1):408-415.
[15]	Yao G,Wang F,Wang X,et al. Magnetic field effects on selective catalytic reduction of NO by NH₃over Fe₂O₃in a magnetically fluidized bed[J]. Energy,2010,35(10):2295-2300.
[16]	Gui K,Liang H,Wand F,et al. Improving the efficiency of lowtemperature SCR of NO by NH₃on iron ore catalyst with a magnetically fluidized bed[J]. Chemical Engineering&Technology,2015,38(9):1537-1542.
[17]	查贤斌,梁辉,归柯庭,等.铁矿石低温催化脱硝性能研究[J].工程热物理学报,2015,36(4):811-815.
[18]	卢慧霞,归柯庭.铁矿石SCR低温脱硝催化剂的改性研究[J].动力工程学报,2017,37(9):726-731.
[19]	张信莉,王栋,陈莲芳,等. Mn掺杂对磁性γ-Fe₂O₃低温SCR脱硝活性的影响[J].工程热物理学报,2014(5):995-998.
[20]	董文杰,周德智,林赫,等.用于NH₃-SCR的锰铈基催化剂的改性研究[J].车用发动机,2013(3):40-44.
[21]	Inomata M,Miyamoto A,Ui T,et al. Activities of vanadium pentoxide/titanium dioxide and vanadium pentoxide/aluminum oxide catalysts for the reaction of nitric oxide and ammonia in the presence of oxygen[J]. Industrial&Engineering Chemistry Product Research and Development,1982,21(3):424-428.
[22]	江博琼. Mn/Ti O₂系列低温SCR脱硝催化剂制备及其反应机理研究[D].杭州:浙江大学,2008.
[23]	赵文雅,李永红,刘小娇,等. Fe改性Cu-SSZ-13的方法对催化剂NH₃-SCR脱硝性能的影响[J].化工进展,2016,35(12):3885-3893.