Copper-exchanged SUZ-4 zeolite catalysts for selective catalytic reduction of NO_x

Abstract

Copper-based SSZ-13 (Cu-SSZ-13, CHA topology) zeolite catalysts have been commercialized currently towards the selective catalytic reduction of NOx with NH3 (NH3-SCR), but Cu-SSZ-13 catalysts are still limited by the great...

Improving the hydrothermal stability of Al-rich Cu-SSZ-13 zeolite via Pr-ion modification

“…2d ), which is due to the formation of CuO x during hydrothermal aging. 6 Cu-SSZ-13-HTA and CuPr 2.4 -SSZ-13-HTA exhibit higher N 2 O yields than CuPr 0.6 -SSZ-13-HTA and CuPr 1.2 -SSZ-13-HTA above 250 °C, indicating their inferior N 2 selectivity.…”

“…Among these strategies, ammonia-mediated selective catalytic reduction (NH 3 -SCR) has emerged as a highly efficient and environmentally friendly technology. [4][5][6] Cu ion-exchanged SSZ-13 zeolite (Cu-SSZ-13) has been successfully employed in NH 3 -SCR applications for heavy-duty transportation trucks. [7][8][9] However, two technical challenges still remain to be solved: (1) high-temperature hydrothermal stability caused by the regeneration of the diesel particulate lter (DPF) and (2) lowtemperature (#200 °C) catalytic activity during the cold start.…”

Green Catalytic Synthesis of Ethylenediamine from Ethylene Glycol and Monoethanolamine: A Review

“…In addition, the yields of cyclic byproducts decrease at higher H 2 concentrations, while lower H 2 concentrations have little effect. Remarkably, Bai provided a simple but effective strategy for doping Fe to disperse Cu and Cr on the surface of the Cu–Cr–Fe/Al 2 O 3 catalyst, which not only improves the catalytic activity and EDA selectivity but also suppresses the sintering of Cu and further extends the catalyst lifetime …”