A review on zeolite catalyst for deNOx performance in ammonia-selective catalytic reduction

Internal combustion (IC) engines rely heavily on NOx emissions. Various studies are being conducted to lower NOx emission in order to achieve the BS-VI norms. This review examines a zeolite catalyst using metal sub-stitutes, primarily copper Cu, and iron Fe, and compares it to a commercial vanadium catalyst in terms of deNOx efficiency and deactivation process. Based on the size of pores of zeolite, it has been classified into large size, medium size and small size zeolites. At low temperature, small pore zeolite with Cu substituted has better deNOx efficiency with higher thermal stability with high-temperature reaction conditions. Whereas, Cu-SSZ-13 & Cu-SAPO-34 exhibits wider temperature window and also exhibits good thermal stability even below 350 degrees C. Si/ Al ratio (SAR) plays a vital role in deNOx efficiency.

Automated summary

This review examines the performance of a zeolite catalyst with metal substitutions in reducing NOx emissions. Zeolite with small pores and copper substitutions exhibits better deNOx efficiency and thermal stability. Cu-SSZ-13 and Cu-SAPO-34 show good thermal stability in a wider temperature range. The Si/Al ratio plays a crucial role in deNOx efficiency.