Applied Catalysis2022，Vol.3039.DOI:10.1016/j.apcatb.2021.120928

NH3-SCR catalysts for heavy-duty diesel vehicles: Preparation of CHA-type zeolites with low-cost templates

Bello, Estefania Ferri, Pau Nero, Mathias Willhammar, Tom Millet, Isabel Schuetze, Frank W. van Tendeloo, Leen Vennestrom, Peter N. R. Boronat, Mercedes Corma, Avelino Moliner, Manuel
Applied Catalysis2022，Vol.3039.DOI:10.1016/j.apcatb.2021.120928
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  • NSTL
  • Elsevier

NH3-SCR catalysts for heavy-duty diesel vehicles: Preparation of CHA-type zeolites with low-cost templates

Bello, Estefania 1Ferri, Pau 1Nero, Mathias 2Willhammar, Tom 2Millet, Isabel 1Schuetze, Frank W. 3van Tendeloo, Leen 4Vennestrom, Peter N. R. 5Boronat, Mercedes 1Corma, Avelino 1Moliner, Manuel1
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作者信息

  • 1. Univ Politecn Valencia
  • 2. Stockholm Univ
  • 3. Umicore AG & Co KG
  • 4. Umicore NV
  • 5. Umicore Denmark ApS
  • 折叠

Abstract

Computer-assistance allows selecting the most adequate low-cost organic structure directing agents (OSDAs) for the crystallization of Al-rich CHA-type zeolites. The host-guest stabilization energies of tetraethylammonium (TEA), methyltriethylammonium (MTEA) and dimethyldiethylammonium (DMDEA), in combination with Na, were first theoretically evaluated. This "ab-initio" analysis reveals that two TEA show a serious steric hindrance in a cha cavity, whereas two MTEA would present excellent host-guest confinements. The synthesis of Al-rich CHA-type zeolites has been accomplished using TEA and MTEA. Electron diffraction and high-resolution transmission electron microscopy reveal large CHA-domains with narrow faulted GME-domains in the CHAtype material synthesized with TEA, confirming the better OSDA-directing roles of MTEA cations towards the cha cavity, in good agreement with DFT calculations. Cu-exchanged Al-rich CHA-type samples achieved with MTEA and TEA show excellent catalytic activity and hydrothermal stability for the selective catalytic reduction (SCR) of NOx with ammonia under conditions relevant for future heavy duty diesel conditions.

Key words

Selective catalytic reduction (SCR)/Nitrogen oxides (NOx)/Small pore zeolites/Chabazite (CHA)/Host-guest organic-inorganic interactions/HIGH-SILICA CHABAZITE/HYDROTHERMAL STABILITY/CU-SSZ-13 ZEOLITE/REDUCTION/SCR/NOX/SSZ-13

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出版年

2022
Applied Catalysis

Applied Catalysis

ISSN：0926-3373
被引量12
参考文献量41
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