کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1654761 | 1007704 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Short-time formation of well-ordered cubic mesoporous MCM-48 molecular sieve with the aid of fluoride ions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
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چکیده انگلیسی
The crystallization time for cubic Ia3d mesoporous MCM-48 molecular sieve was first reduced by combining slight increase of reaction temperature with addition of tiny fluoride ions to the synthesis system. The reaction time reduces with the increasing F− / Si ratio, but the high ratio of 0.4 will only lead to a disordered structure with poor crystallinity. The pore ordering is also considerably improved with the aid of fluoride ions even the reaction time is much shorter than those without any fluorides. The time-reduction action of fluoride ions on the synthesis of MCM-48 is attributed to the accelerated hydrolysis speed of silica source and condensation degree of silicates by fluoride ions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 59, Issue 28, December 2005, Pages 3604–3607
Journal: Materials Letters - Volume 59, Issue 28, December 2005, Pages 3604–3607
نویسندگان
Lingzhi Wang, Yaofeng Shao, Jinlong Zhang,