Porous bimetallic Mn2Co1Ox catalysts prepared by a one-step combustion method for the low temperature selective catalytic reduction of NOx with NH3

A Review of Low Temperature NH3-SCR for Removal of NOx

“…Step 2); Gaseous NO was adsorbed and subsequently reacted with O* to form NO2/NO3 − intermediates (Step 3); Meanwhile, NH3 was activated to −NH2 and NH4 + species by Mn 4+ (Step 4); Finally, NO2/NO3 − intermediates reacted with the NH species to produce reaction products, N2, and H2O (Step 5); By the electron transfer from Mn 3+ to Co 3+ (Step 6); the catalyst was recovered to its original state (Step 7); Thus, the synergistic effect between the Co and Mn plays a key role in improving the NH3-SCR activity over Co7Mn3Ox catalyst. Mesoporous materials have been proved as promising catalysts for NH3-SCR reaction since they can facilitate to promote effective diffusion of reactants towards the active sites [30,65,66,68]. With this perspective, Hu et al [47] developed mesoporous 3D nanosphere-like Mn-Co-O catalysts through a template-free approach and evaluated for low-temperature NH3-SCR reaction.…”

Improved Low‐Temperature Activity and H2O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH3−SCR

“…[16,17] It is well recognized that various valence states of Mn and abundant surface active oxygen species on MnO x greatly facilitate the catalytic cycle in SCR reactions. [18] Consequently, researchers have begun to work on studies about supported Mn-based SCR catalysts. [18] Consequently, researchers have begun to work on studies about supported Mn-based SCR catalysts.…”

“…However, the poor thermal stability and low specific surface areas of pure MnO x restrict its industrial applications. [18] Consequently, researchers have begun to work on studies about supported Mn-based SCR catalysts. [19] TiO 2 , [20] Al 2 O 3 , [21] SiO 2 [22] and activated carbon (AC) [23] are usually used as supports.…”

Mn−Co Mixed Oxide Nanosheets Vertically Anchored on H2Ti3O7 Nanowires: Full Exposure of Active Components Results in Significantly Enhanced Catalytic Performance

“…[12,13] However,p ure MnO x catalysts still suffer from serious challenges owing to the low surfacearea, poor water tolerance and thermals tability.C onstructingM nO x -based composite oxidesb ym ixing with the other metal oxides is considered as an effective strategy to overcome these shortcomings.B ased on this, Mn-Ce,M n-Fe, and Mn-Tic omposite oxides have been developed for the SCR of NO x ,a nd remarkable achievements have been made. [22][23][24] Therefore, MnÀCo composite oxides with different morphologies ands tructures, such as nanocages, [25] micro/nanospheres, [26][27][28] porouss tructures, [29] orderedm esoporous structures, [30] polyporous network structures, [31] have been successfully developed for the SCR of NO x .E ven MnÀCo composite oxidesl oaded on different supports, such as reduced graphene oxide (rGO), [32] TiO 2 , [33,34] ZSM-5, [35] have also been explored for the application of SCR de-NO x .F rom the view of taking full advantageo ft he activei ngredient of the catalysts, The full exposure of active ingredients plays an important role in the enhancement of catalytic performance. Moreover,i ti sw ellk nown that the morphology and structure of catalysts play an important role in their catalytic performance in addition to the desirable compositions.…”

“…Moreover,i ti sw ellk nown that the morphology and structure of catalysts play an important role in their catalytic performance in addition to the desirable compositions. [22][23][24] Therefore, MnÀCo composite oxides with different morphologies ands tructures, such as nanocages, [25] micro/nanospheres, [26][27][28] porouss tructures, [29] orderedm esoporous structures, [30] polyporous network structures, [31] have been successfully developed for the SCR of NO x .E ven MnÀCo composite oxidesl oaded on different supports, such as reduced graphene oxide (rGO), [32] TiO 2 , [33,34] ZSM-5, [35] have also been explored for the application of SCR de-NO x .F rom the view of taking full advantageo ft he activei ngredient of the catalysts, The full exposure of active ingredients plays an important role in the enhancement of catalytic performance. In this work, a series of novel catalysts, MnÀCo mixed oxide nanosheets with ultrathin thickness (about 3.5 nm) and different Mn/Cor atios (0.52, 0.69, and 1.52) vertically anchored on as upport (H 2 Ti 3 O 7 nanowires), are rationally developed.…”