Corrigendum to “Effects of hydrothermal aging on NH3-SCR reaction over Cu/zeolites” [J. Catal. 287 (2012) 203–209]

Effects of post-treatment method and Na co-cation on the hydrothermal stability of Cu–SSZ-13 catalyst for the selective catalytic reduction of NO with NH3

“…This weakness prevents those catalysts from being commercialized in real world applications. Recently, the Cu-SSZ-13 catalyst with the chabazite (CHA) structure attracted much attention for NO x removal from diesel engine exhaust due to its excellent performance, hydrothermal stability and high resistance to small hydrocarbon molecules in the NH 3 -SCR reaction [16][17][18][19][20]. However, the template N,N,Ntrimethyl-1-adamantammonium hydroxide (TMAdaOH) was needed in the synthesis of SSZ-13 zeolite, resulting in high cost for conventional Cu-SSZ-13 catalysts [21].…”

The Effect of Copper Loading on the Selective Catalytic Reduction of Nitric Oxide by Ammonia Over Cu-SSZ-13

“…Compared to Cu-ZSM-5 and Cu-beta, they have been found to be more active and selective, and less prone to deactivation by hydrocarbon inhibition or thermal degradation [4][5][6][7][8]. For example, following hydrothermal treatment at 800°C for 16 h, little changes in NO x reduction activity and physicochemical properties were observed for Cu ion-exchanged SSZ-13 (Cu-SSZ-13), a zeolite with the Chabazite (CHA) structure containing small radius (*3.8 Å ) eight-membered ring pores [9]. In this paper, the effects of Cu loading on the NO x reduction activity and selectivity over Cu-SSZ-13 were examined in order to determine the optimum ion exchange level.…”

Selective catalytic reduction of nitrogen oxides with ammonia over microporous zeolite catalysts

“…Furthermore different ring sizes are present in the various structures (see Table 2.1), which also leads to various sites for copper coordination. Based on findings of Kwak et al, who found optimal copper loads in CHA zeolite SSZ-13 to be around 2.4 -3.4 wt.% for the NH 3 -SCR reaction, [42] all catalyst were impregnated with the aim of obtaining 2.8 wt.% Cu in the final materials.…”

“…[114] In addition Yan et al discuss the formation of CuO and Al 2 O 3 , which can irreversibly form CuAl 2 O 4 under severe aging conditions, [115] which is in agreement with the study by Kwak et al who showed a strong interaction between Cu and Al after severe hydrothermal treatments in Cu-zeolites. [42] Other authors have suggested the formation of CuO and Cu 2 O, which leads to local destruction of the framework. [116] Even migration of copper species to inaccessible sites have been reported earlier as an explanation for the loss in catalytic activity.…”

“…As shown in Chapter 2 and recently reported by Fickel et al small-pore zeolites show superior hydrothermal stability compared to other zeolites. [33] Especially copper exchanged SSZ-13 with the CHA framework topology has attracted substantial attention, [36,42,51,69,70] and have within the last few years also become a commercialized catalyst. [71][72][73] The CHA topology consists of a three-dimensional porous system with cavities and small-pore 8-member-ring windows with a free diameter of 3.8 x 3.8 Å.…”