Superior catalytic performance of Zr-incorporated MnCu/SBA-15 catalyst for low-temperature NH3-SCR of NO: Effect of support

Unravelling the Role of Zr–Laponite Supports in Enhancing the Activity of a MnNi Catalyst for the Low-Temperature NH3-Selective Catalytic Reduction Reaction

“…We evaluated the deNO x efficiency under optimized reaction conditions and varied the GHSV in the range of 30 600–59 400 mL g cat –1 h –1 at 220 °C (Figure b). The deNO x efficiencies of MnNi/Zr–Laponite(3) and MnNi/ZrO 2 decreased with an increase in the GHSV . The highest deNO x efficiency (90%) of MnNi/Zr–Laponite(3) was observed with a low GHSV of 30 600 mL h –1 g cat –1 , which can be attributed to the prolonged residence time.…”

“…However, MnNi oxide peaks were not detected in the XRD patterns of MnNi/Zr–Laponite catalysts, indicating that the Laponite structure was preserved, despite the presence of ∼14 wt % MnNi on the Zr–Laponite. This can be attributed to the high dispersion of the metallic species on the support , (Figure b).…”

“…Cu-, Fe-, Mo-, or Cr-based catalysts are promising for NH 3 -SCR owing to their acidity, wide temperature range for catalytic activity, and recyclability. − In particular, MnO 2 -based catalysts showed good catalytic activity among the low-temperature SCR catalysts. , Recently, catalysts based on Mn metal–organic frameworks (MOFs) have demonstrated exceptional deNO x activity at low temperatures. − Nevertheless, the temperature range and durability of these catalysts could be improved further by modifying their support materials . Even though zeolite-supported catalysts show excellent hydrothermal stability and superior catalytic performance in NH 3 -SCR reactions, they are expensive, which limits their application, especially in off-road vehicles …”

“…Moreover, other zirconium-based supports, such as CeO 2 –ZrO 2 , CeZrO x , CeZr 2 O x , and WO x –ZrO 2 , exhibit a porous structure and acid–base properties that enhance the adsorption and desorption of reactants and improve catalytic performance. In addition, the incorporation of Zr into other support systems, such as TiO 2 , zeolite, and SBA-15, improved the redox properties, NH 3 adsorption, and NO x conversion in NH 3 -SCR reactions. ,, However, further research on optimizing the synthesis methods for Zr-based supports, exploring different catalyst–support compositions, and elucidating the mechanisms underlying the enhancement in catalytic performance is required.…”

Surface Effects of Trace CuMnCe Loading on Coal-Based Carbon Materials and Mechanisms of NOx Adsorption and Removal

“…These methods include improving pore structure through doping with different substances, enhancing surface activity groups through impregnation of metal oxides, and optimizing activation temperature and atmosphere, which play a crucial role in the adsorption of NO x . , Wang et al used different concentrations of K 2 CO 3 for hydrothermal activation of Zhundong coal and found that the sample prepared with a K 2 CO 3 concentration of 0.01 g/mL exhibited a well-developed pore structure and significantly improved NO x adsorption performance. Wang et al developed a MnCuCeOx/γ-Al 2 O 3 catalyst modified with MNO x , which possesses dual active sites for NO x removal.…”