کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
75537 49117 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of template on Si distribution of SAPO-11 and their performance for n-paraffin isomerization
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Influence of template on Si distribution of SAPO-11 and their performance for n-paraffin isomerization
چکیده انگلیسی

SAPO-11 molecular sieves were synthesized using single agent (i.e. diethylamine (DEA), di-iso-propylamine (DIPA) and di-n-propylamine (DPA)) or a mixture of DEA and DIPA (named DEPA) as the template under hydrothermal conditions. XRD indicated that the directing effect of different templates for AEL structure decreased in the order of DEPA > DPA > DIPA > DEA. 29Si MAS NMR showed that although all SAPO-11 samples synthesized at same Si content, that prepared with the mixed template contained more Si (4Al) sites, whereas Si (nAl, 4-nSi, 0 < n < 4) environments were predominant in the samples synthesized with single template. The results indicated that the mixed template led to a better Si dispersion and then increased the number of total acid sites of SAPO-11. In the isomerization of n-tetradecane over different Pt/SAPO-11 catalysts, the sample prepared with DEPA showed high catalytic activity and selectivity for i-C14, which were related to the most abundant weak acid sites of the sample.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 114, Issues 1–3, 1 September 2008, Pages 365–372
نویسندگان
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