FeZSM-5: A Durable SCR Catalyst for NOxRemoval from Combustion Streams

Effect of Oxygen Concentration in NH₃-SCR Reaction over Fe- and Cu-loaded Beta Zeolites

“…In general, the ion-exchange method is suitable for loading metal components with a good dispersion. For loading the Fe component, however, difficulties in the preparation of Fe-loaded zeolite with high ion-exchange degrees have been reported 16) . To investigate the influence of a wide range of metal content, therefore, the incipient wetness method was selected for the Fe-loaded zeolite.…”

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

“…The use of Fe-MFI systems for direct N 2 O decomposition has been described in several publications [1][2][3][4]. Fe-ZSM5 catalysts have also attracted much attention due to their extraordinary activity for hydrocarbon-assisted reduction of N 2 O [5,6], N 2 O reduction by NH 3 [7], oxidation of benzene to phenol (Panov's group [8]), and selective catalytic reduction (SCR) of NO x with hydrocarbons [9][10][11][12] and NH 3 [13].…”

“…Alternative procedures to the approach of Feng and Hall [9,10,14] have been investigated in gas-phase [15][16][17][18][19][20][21], solidstate [11,12,22], and aqueous ion exchange using different types of Fe-salt solutions [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Sublimation of FeCl 3 results in Fe loadings as high as Fe/Al = 1, but it is generally observed that after washing and calcination iron is clustered to inactive FeO x [28].…”

Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3

“…Iron loaded zeolites have recently attracted renewed attention due to their outstanding catalytic properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In particular, over-exchanged Fe/ZSM5 (Fe/Al molar ratio > 0.5) obtained through the chemical vapor deposition (CVD) of anhydrous iron trichloride has been reported to be very efficient in the selective catalytic reduction of nitrogen oxides using HydroCarbons (HC-SCR).…”

“…These include aqueous ion exchange from ferrous oxalate, performed under exclusion of air [8], and solid-state ion exchange using Fe(II)chloride [9,10], Fe(III)chloride [11][12][13][14] or FeSO 4 · 7H 2 O [15]. The synthesis in aqueous solution with ferrous oxalate as precursor has led to results comparable to those obtained through the CVD of FeCl 3 , with respect to both the iron loading and the catalytic activity towards HC-SCR with isobutane.…”