化工学报 ›› 2013, Vol. 64 ›› Issue (8): 2867-2874.DOI: 10.3969/j.issn.0438-1157.2013.08.024

• 催化、动力学与反应器 • 上一篇    下一篇

碱金属化合物对V2O5/AC催化剂低温脱硝的影响

韩斌, 雷志刚, 刘茜, 陈标华   

  1. 北京化工大学化工资源有效利用国家重点实验室, 北京 100029
  • 收稿日期:2012-12-11 修回日期:2013-05-10 出版日期:2013-08-05 发布日期:2013-08-05
  • 通讯作者: 雷志刚
  • 作者简介:韩斌(1986- ),男,硕士研究生。
  • 基金资助:

    国家自然科学基金项目(21121064,21076008)。

Influence of alkali metal compound on low-temperature NH3-SCR of NO over V2O5/AC catalyst

HAN Bin, LEI Zhigang, LIU Xi, CHEN Biaohua   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2012-12-11 Revised:2013-05-10 Online:2013-08-05 Published:2013-08-05
  • Supported by:

    supported by the National Natural Science Foundation of China(21121064,21076008).

摘要: 研究了碱金属化合物(K2SO4)对活性炭(AC)担载五氧化二钒(V2O5)组成的V2O5/AC催化剂的低温脱硝活性的影响。发现在V2O5/AC催化剂表面负载碱金属化合物(K2SO4)后其脱硝活性大大降低。用等体积浸渍法制备了V2O5/AC催化剂和Kx-V2/AC(x=0.5,1,2)催化剂。采用5种模型对动力学实验数据进行关联。结果显示,无论V2O5/AC催化剂是否负载K2SO4,Eley-Rideal模型均比其他模型可更好地描述SCR脱硝反应,碱金属化合物(K2SO4)的存在提高了反应活化能,但并不改变反应机理。

关键词: 选择性催化还原, V2O5/AC催化剂, 碱金属化合物, 反应动力学

Abstract: The influence of alkali metal compound(K2SO4)on kinetics of low-temperature SCR of NO by NH3 over V2O5(vanadium pentoxide)/AC(activated carbon)catalyst was investigated.The reaction activity decreased obviously when doping the V2O5/AC catalyst with alkali metal compound.The V2O5/AC and Kx-V2/AC(x=0.5,1,2)catalysts were prepared by the pore volume impregnation method.First,the influence of internal and external diffusions on the intrinsic kinetics experiment was eliminated. Then NH3 SCR experiments with different NO-to-NH3 ratios at various temperatures were carried out to test the model.Both the mechanical(i.e.Eley-Rideal model,Langmuir-Hinshelwood model,and Mars-van Krevelen model)and empirical(i.e.first-order model and power-rate law model)models were used to correlate the experimental data.The results showed that the Eley-Rideal model could well describe the SCR of NO by NH3 over V2O5/AC catalyst than other models whether alkali metal compound was doped in the V2O5/AC catalyst or not.The presence of alkali metal compound increased the reaction activation energy,but not the reaction mechanism.

Key words: selective catalytic reduction, V2O5/AC catalyst, alkali metal compound, reaction kinetics

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