Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (9): 1438-1445.DOI: 10.1016/S1872-2067(14)60048-6

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Selective catalytic reduction of NOx by NH3 for heavy-duty diesel vehicles

Fudong Liua, Wenpo Shana, Dawei Panb, Tengying Lib, Hong Hea   

  1. a Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
    b China National Heavy Duty Truck Group Jinan Rubber and Plastic Co., Ltd., Jinan 250031, Shandong, China
  • Received:2013-12-30 Revised:2014-01-26 Online:2014-08-19 Published:2014-08-22
  • Supported by:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, 2013AA065301) and the National Natural Science Foundation of China (51108446, 51278486).

Abstract:

A catalyst production line with a production capacity of 6000 catalyst monoliths per month for the selective catalytic reduction of NOx by NH3 (NH3-SCR) for NOx abatement in diesel vehicle exhaust was set up based on a detailed laboratory study of the catalyst formulation and washcoating technology for V2O5-WO3/TiO2 catalyst. The catalyst produced by this line was tested on a bench scale diesel engine. The V2O5-WO3/TiO2 powder catalyst prepared in the laboratory and production line both achieved >80% NOx conversion at 200-450 ℃ and a GHSV of 50000 h-1. The washcoated catalyst used a large cordierite support and gave >80% NOx conversion at 250-450 ℃ and GHSVs of 10000-30000 h-1. The engine bench tests showed that after treatment by the catalyst, the NOx emission met the European steady-state cycle (ESC) and European transient cycle (ETC) limits of the China IV standard. The production line can also be used for the production of vanadium-free NH3-SCR catalysts to meet the required replacement of the present vanadium-based NH3-SCR catalyst in the future.

Key words: Diesel exhaust, Nitrogen oxide, Selective catalytic reduction, Vanadium-based catalyst, Industrial production