Unveiling remarkable resistance to Pb poisoning over an Fe–Mo catalyst for low-temperature NH₃-SCR: poison transforms into a promoter

Abstract

Lead (Pb) poisoning is a significant issue for low-temperature selective catalytic reduction of NOx with NH3 (NH3-SCR) application, whereas the development of effective Pb-resistant catalyst is still challenging. Herein, a...

A Novel MnOx–MoOx Codoped Iron-Based Catalyst for NH3-SCR with Superior Catalytic Activity over a Wide Temperature Range

“…Negative peaks at 1957−1959 cm −1 were attributed to the adsorption of NH 3 on MoO x . 51 Furthermore, the bands in the range of 3150−3354 cm −1 denoted the vibrations of the N−H bond of NH 3 on the catalyst surface, while the negative peaks at 1331−1346 cm −1 were attributed to the depletion of hydroxyl groups reacting with NH 3 . 21,52,53 We found that the adsorption of NH 3 on the surface of the MF catalyst was relatively weak according to Figure 7a,c.…”

Insight into the Alkali Resistance Mechanism of FeMoTiOx Catalysts for NH3 Selective Catalytic Reduction of NO: Self-Defense Effects of MoOx for Alkali Capture

“…15 Furthermore, in combination with other metal oxides, such as FeO x , the temperature windows of MoO x -based SCR catalysts exhibit a significant shift toward a lower range. 16 Therefore, the development of MoO x -based catalysts for efficient NO elimination in lowtemperature flue gas is promising. Furthermore, MoO x species exhibit remarkable resistance to SO 2 in the SCR reaction.…”

“…Molybdenum oxides (MoO x ), which are typically utilized as co-catalysts in commercial V-based SCR catalysts, have been demonstrated to also serve as active sites in the SCR reaction at temperatures exceeding 250 °C. − Importantly, numerous studies have shown that MoO x addition can influence the properties of acid sites, enhance surface oxygen activity, and tune the chemical states of surface elements, thereby showing promising potential in enhancing the low-temperature SCR activities of MnO x /γ-Al 2 O 3 , CuO, and CeFeO x . Furthermore, in combination with other metal oxides, such as FeO x , the temperature windows of MoO x -based SCR catalysts exhibit a significant shift toward a lower range . Therefore, the development of MoO x -based catalysts for efficient NO elimination in low-temperature flue gas is promising.…”

Active vanadium(iv) species synthesized at low-temperature facilitate excellent performance in low-temperature NOx-catalytic removal

“…Nitrogen oxides (NO x ) are important precursors leading to the formation of acid rain, photochemical smog, and haze, primarily from industrial boilers (fixed source) that rely on fossil fuel combustion to generate heat and mobile vehicles (mobile source) that consume diesel. 1 Among many NO x elimination (de-NO x ) catalysts, such as one or more combinations of metal oxide catalysts (V, 2 Mn, 3 Mo, 4 W, 5 Ce, 6 and Fe (ref. 7)) and ion-exchanged molecular sieves (Cu-SSZ-13, 8 Cu-SAPO-34, 9 and Cu-SSZ-39 (ref.…”