Theoretical and experimental study on metal-loaded zeolite catalysts for direct NOx decomposition

Selective catalytic reduction of NO to N2 with copper and cobalt exchanged ZSM-5 zeolites: the effect of calcium addition

“…For the bicationic Co-Ca catalyst the relatively intense band at around 550 nm suggests the presence of a higher amount of Co-complexes or Co-Ca-mixed oxides than in the monometallic Co-catalyst. 4,15 For the |Co 0.29 |[Si 12 Al]-MFI catalyst the band near 350 nm, which is attributed to Co 3+ , possesses a very low intensity and this indicates that here Co 2+ is predominant, as observed from the lowest H 2 / TM ratio in the H 2 -TPR measurement ( Table 1).…”

“…Yokomichi et al 4 demonstrated that the addition of Ca 2+ cations in ZSM-5 exchanged with copper cations reduced the deactivation caused by oxygen or water vapour and increased the range of temperatures in which these catalysts are active. For cobalt containing ZSM-5 catalysts, the addition of alkaline-earth metals suppressed the conversion of the hydrocarbon and increased NO conversion.…”

Low temperature catalytic oxidation of nitric oxide over the Mn–CoOx catalyst modified by nonthermal plasma

“…Various techniques have been developed for the elimination of NO x from stationary sources, such as selective catalytic reduction (SCR) [3], selective non-catalytic reduction (SNCR) [4], direct decomposition [5], and non-thermal plasma (NTP) [6]. The catalytic oxidation of NO to NO 2 has been focused on due to its key step for many De-NO techniques [7][8][9].…”

SCR of NOx by C3H6: comparison between Cu/Cr/CeO2 and Cu/Ag/CeO2 catalysts

“…The bimetal catalyst concept was introduced in the SCR-HC to improve the performance of the supported Cu catalyst by adding certain promoters [19][20][21][22]. The cocationpromoted copper catalysts have been extensively zeolitebased catalytic systems in NO x abatement [23][24][25][26].…”