کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
60992 | 47558 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Specific cyclic ammonium cations allow the direct synthesis of Cu-SAPO-18 catalysts.
• Complete framework Si isolation can be achieved for Cu-SAPO-18 materials.
• Cu-SAPO-18 shows high catalytic activity and hydrothermal stability for SCR of NOx.
The combination of Cu(II) triethylenetetramine and N,N-dimethyl-3,5-dimethylpiperidinium as structure directing agents allowed the direct preparation of highly active and hydrothermally stable Cu-SAPO-18 for the selective catalytic reduction of NOx with NH3. The approach allows performing a one-pot synthesis avoiding intermediate calcination and ion exchange, while achieving complete framework Si isolation. Combination of physicochemical characterization techniques show that copper exists as extra-framework Cu2+, which have been identified as the specific active sites for the SCR of NOx. The selective presence of isolated Si species in the zeolitic framework introduces high hydrothermal stability.
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Journal: Journal of Catalysis - Volume 319, November 2014, Pages 36–43