Vietnam Journal of Catalysis and Adsorption

REVIEW PAPER

open access logo 200x200Development of low-temperature catalysts for the selective catalytic reduction of NOx with NH3: Review

Thanh Huyen Vuong1,2,This email address is being protected from spambots. You need JavaScript enabled to view it., Anh Tuan Doan2, Thanh Huyen Pham2, Angelika Brückner1

1 Leibniz Institute for Catalysis at the University of Rostock, Albert-Einstein-Str. 29a, D-18059 Rostock, Germany
2 School of Chemical Engineering, Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi, Vietnam

ABSTRACT

Selective catalytic reduction (SCR) of nitrogen oxides by ammonia over V2O5-WO3/TiO2 catalysts is one of the most popular techniques to control NOx emission from combustion processes which, however, operates only in a rather high and narrow temperature range of 300-500°C. The temperature of other NOx sources such as diesel or lean-burn gasoline engines is much lower. Therefore, development and optimization of catalysts being highly active and selective for NH3-SCR of NOx already at temperatures well below 300°C is highly desirable. In recent years, significant efforts have been dedicated to developing de-NOx catalysts for both stationary sources and diesel engines working at low temperatures. Among various SCR catalysts, Mn-based catalysts obtained the highest low-temperature activity. However, their low SO2 and H2O resistance, and preference for N2O formation limited these catalysts for industrial applications. V2O5 supported on different materials still have attracted much attention due to high SCR activity and SO2 tolerance at low temperatures. Recently, Cu-containing small pore zeolites with a CHA or AEI structure, such as Cu-SSZ-13, Cu-SAPO-34, and Cu-SSZ-39, Cu-SAPO-18, respectively, exhibited high low-temperature activity and high-temperature excellent hydrothermal stability, and thus received much attention for applications on diesel vehicles. In this review, we will focus on the development of different catalysts for low-temperature NH3-SCR of NOx.

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