کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10632758 | 992438 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and NMR characterization of SAPO-35 from non-aqueous systems using hexamethyleneimine template
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Synthesis and NMR characterization of SAPO-35 from non-aqueous systems using hexamethyleneimine template Synthesis and NMR characterization of SAPO-35 from non-aqueous systems using hexamethyleneimine template](/preview/png/10632758.png)
چکیده انگلیسی
SAPO-35 was synthesized using hexamethyleneimine template in non-aqueous systems. X-ray diffraction and scanning electron micrograph analysis shows the synthesized sample is pure and well crystalline. Presence of four stages (1.6%, 0.8%, 7.8% and 8.4%) of weight loss is observed by TG/DTA analysis. FT-IR analysis in the framework region shows the presence of tetrahedral T-O-T vibrations is similar to the other known aluminophosphate molecular sieves. FT-IR spectrum in the OH region shows stretching vibrations at 3631, 3604 and 3580 cmâ1 can be assigned to OH groups in bigger cages near S6R, in bigger cages near D6R and those actually confined inside the D6R, respectively. The spectra for the as-synthesized sample show a single symmetrical 27Al MAS NMR line at δ = 36.26 indicating the presence of a single tetrahedral aluminium species. Where as 29Si and 31P MAS NMR shows the presence of two peaks in both at (â89.9 and â95.15 ppm) and (â34.01 and â40.45 ppm) due to the Si substitution of P present in two different locations in double 6 ring (D6R) and in single 6 ring (S6R). 27Al 3Q-MAS NMR shows two peaks for environmentally different tetrahedral aluminium atoms. This is the first time we are showing such a fact which is not observable using ordinary MAS NMR.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 40, Issue 7, 12 July 2005, Pages 1157-1165
Journal: Materials Research Bulletin - Volume 40, Issue 7, 12 July 2005, Pages 1157-1165
نویسندگان
N. Venkatathri,