期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 312, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110736
关键词
Aluminosilicate SSZ-39 zeolite; Solvent-free; NH3-SCR reaction; Green synthesis
类别
资金
- Zhejiang Shuren University Basic Scientific Research Special Funds [2020XZ011]
- National Natural Science Foundation of China [21802053, 21773094, 21902065]
A solvent-free synthesis method for aluminosilicate SSZ-39 zeolite using DMDMP as an organic structure-directing agent is reported for the first time. The zeolite exhibits excellent catalytic performance in NH3-SCR reaction with high crystallinity, uniform morphology, large surface area, and strong acidic sites. The method shows advantages such as high product yield, simple synthesis procedures, and reduction of pollutants.
Aluminosilicate SSZ-39 zeolite shows the excellent catalytic performance in selective catalytic reduction of NOx with NH3 (NH3-SCR) reaction, but their synthesis is still not efficient due to the use of a large amount of water as a solvent under hydrothermal condition. Herein, for the first time, we report a solvent-free synthesis of aluminosilicate SSZ-39 zeolite without addition of water in the presence of N,N-dimethyl-3,5-dimethylpiperidine (DMDMP) cation as an organic structure-directing agent. Various characterizations, including powder X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry-differential thermal analysis (TG-DTA), N-2 sorption, inductively coupled plasma optical emission spectroscopy (ICP-OES) analysis, solid nuclear magnetic resonance (NMR) and NH3-temperature-programmed desorption (NH3-TPD), show that the aluminosilicate SSZ-39 zeolite displays high crystallinity, uniform sheet-like morphology, large surface area, four-coordinated aluminum species, strong acidic sites and excellent hydrothermal stability. Compared with the conventional synthesis for aluminosilicate SSZ-39 zeolite, the solvent-free synthesis of aluminosilicate SSZ-39 zeolite has the obvious advantages such as high product yield, simple synthesis procedures, and the reduction of pollutants. More importantly, the copper-exchanged aluminosilicate SSZ-39 zeolite shows the good catalytic performance in NH3-SCR reaction, which is fully comparable with that of the Cu-SSZ-39 zeolite synthesized under hydrothermal condition from the reported literature.
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