Novel preparation method, catalytic performance and reaction mechanisms of PrxMn1−xOδ/3DOM ZSM-5 catalysts for the simultaneous removal of soot and NO

Simultaneous Removal of Soot and NOx from Diesel Engines over Three-Dimensionally Ordered Macroporous ZSM-5-Supported MMnOδ Catalysts

“…This implies the existence of Fe 3+ in the catalyst, in line with the XRD results. , As shown in Figure S2Ab, the Co 2p 3/2 and Co 2p 1/2 are situated at 780.6 and 796.1 eV, respectively, the spin energy separation is 15.5 eV, and it is the same as the literature . In the Ce 3d spectrum, the peaks at 916.9–900.1 eV belong to Ce 3d 3/2 , whereas those at 898.4–882.9 eV are attributed to Ce 3d 5/2 . , The peaks in the Pr 3d spectrum belong to Pr 3d 5/2 (934.0 eV) and Pr 3d 3/2 (954.3 eV) . The characteristic peaks in the W 4f spectrum (Figure S2Ae) correspond to W 4f 5/2 (37.2 eV) and W 4f 7/2 (35.0 eV) .…”

“…57,58 The peaks in the Pr 3d spectrum belong to Pr 3d 5/2 (934.0 eV) and Pr 3d 3/2 (954.3 eV). 59 The characteristic peaks in the W 4f spectrum (Figure S2Ae) correspond to W 4f 5/2 (37.2 eV) and W 4f 7/2 (35.0 eV). 48 No obvious peak is observed in the binding energy range of 34.0−30.0 eV, indicating that metal W is not present in the WMnO δ /3DOM ZSM-5.…”

Design, Synthesis, and Insights into the Redox Mechanism of Highly Efficient One-Pot Cu-ZSM-5 Catalysts for the Reduction of NOx by NH3-SCR at Low Temperatures

“…H-ZSM-5, Cu 2.0 /ZSM-5-T, Cu 2.0 /ZSM-5-T-A, Cu x -ZSM-5-O, and Cu x -ZSM-5-O-A possess typical MFI structures, as shown in Figure A,B, with main peaks located at 7.8, 8.8, 23.1, 23.8, and 24.3°, respectively (JCPDS Card No. 44-0003), which proves that Cu-ZSM-5-O is successfully synthesized by the one-pot method . As we can see in Figure A,B, one-pot catalysts and Cu 2.0 /ZSM-5-T maintain the MFI structure after post-treatment.…”

“…17 Therefore, the Cu-(EDA) 2 complex keeps stable rather than forming Cu(OH) 4 2− in the alkaline gel during the synthesis process. 26 As we can see in Figure 1A,B, one-pot catalysts and Cu 2.0 /ZSM-5-T maintain the MFI structure after posttreatment. It is worth noting that the synthesis of Cu-ZSM-5-O with the Cu-(EDA) 2 complex is much easier and more readily while the preparation of H-ZSM-5 templated by EDA is harsh and limited.…”

Recent Progress in the Application of Transition‐Metal Containing MFI topologies for NH3‐SCR‐DeNOx and NH3 oxidation

“…[99] Significant sulfur resistance was reported also for other catalysts, including Fe-encapsulated ZSM-5 zeolite with nanosheet-assembled structure [143] and Pr x Mn 1-x O δ /3DOM ZSM-5. [144] Although in some of the above studies the authors (e. g., [130,140,141] ) claimed that the presence of mesopores can enable faster transport of the reactants to active sites this proposal has not been confirmed experimentally. At least, the activation energy, the Thiele modulus and the effectiveness factor (η = r obs /r intrinsic , that relates the observed reaction rate and the intrinsic reaction rate) should be used as indicators of the presence or absence of diffusion limitations in mesoporous zeolites.…”