Novel low-temperature lean NOx storage materials based on La0.5Sr0.5Fe1-xMxO3-δ/Al2O3 infiltration composites (M = Ti, Zr, Nb)

Advancements in In-Cylinder and After-Treatment Strategies for Mitigating Pollutants from Diesel Engines: A Critical Review

“…A number of alternatives have been proposed, such as perovskites. Ecker et al 254,255 synthesized a platinized p e r o v s k i t e -b a s e d i n fi l t r a t i o n c o m p o s i t e P t / La 0.5 Sr 0.5 Fe 0.5 Ti 0.5 O 3 /Al 2 O 3 , but it was observed that at lower temperatures the competing reactions with C 3 H 6 -SCR resulted in a dramatic increase in N 2 O. This catalyst was further coated with Rh, and this led to an increase in NO x storage capacity (NSC), although no decrease in N 2 O emissions was observed within a temperature range of 300−450 °C.…”

“…A number of alternatives have been proposed, such as perovskites. Ecker et al 254,255 Albaladejo-Fuentes et al 256 studied the BaTi 0.8 Cu 0.2 O 3 catalyst and observed that BaO generated on the catalyst by decomposition of Ba 2 TiO 4 is essential in the NO x storage process. At temperatures <350 °C, NO adsorption leads to formation of nitrites on the catalyst, and at temperatures >350 °C, NO oxidation occurs and promotes NO 2 generation and nitrate formation.…”

NOx Storage and Reduction (NSR) Performance of Sr-Doped LaCoO3 Perovskite Prepared by Glycine-Assisted Solution Combustion

“…Researchers have explored and recognized NOx storage and reduction (NSR) [1] and selective catalytic reduction (SCR) [2] as effective methods for removing NO x from exhaust emissions. NSR catalysts typically consist of active components such as noble metals (Pt, Pd, Rh) [3,4], storage components such as alkali or alkaline earth metals, and supports such as Al 2 O 3 or CeO 2 [5,6]. A representative catalyst commonly employed in NO x storage and reduction (NSR) systems is Pt-BaO/Al 2 O 3 .…”

Electrification-Enhanced Low-Temperature NOx Storage–Reduction on Pt and K Co-Supported Antimony-Doped Tin Oxides

“…Storage and reduction of NO x (NSR), also known as lean NO x traps (LNT), are currently employed for controlling NO x emission from light-duty diesel vehicles, − which periodically injects fuels into the exhaust, resulting in alternating fuel-lean and fuel-rich conditions. In the lean conditions, NO is oxidized to NO 2 and stored on NSR catalysts as nitrites/nitrates, while in the rich condition, the stored NO x species are desorbed and reduced to N 2 by the injected fuels, such as H 2 , CO, and C 3 H 6 . − A typical NSR catalyst is primarily composed of active components for NO oxidation and NO x reduction (noble metals such as Pt, Pd, and Rh), adsorption components for NO x storage (alkali/alkaline earth metals such as K and Ba, and perovskites), and supports with large specific surface areas (for instance, Al 2 O 3 , Mg–Al mixed oxides, and zeolites , ).…”