کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9617774 | 49168 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and proton conductivity of sulfonic acid functionalized zeolite BEA nanocrystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Synthesis and proton conductivity of sulfonic acid functionalized zeolite BEA nanocrystals Synthesis and proton conductivity of sulfonic acid functionalized zeolite BEA nanocrystals](/preview/png/9617774.png)
چکیده انگلیسی
The objective of this study is to prepare sulfonic acid functionalized zeolite BEA nanocrystals, and determine the bulk proton conductivity of this new material. Phenethyl functionalized zeolite BEA nanocrystals are synthesized using a mixture of fumed silica and phenethyltrimethoxysilane as silica sources. Contact of the phenethyl zeolite BEA nanocrystals with concentrated sulfuric acid removes the organic structure-directing agent (SDA) and simultaneously sulfonates the phenethyl moieties. Detailed characterizations of the zeolite BEA nanocrystals are performed using dynamic light scattering (DLS), Fourier transform Raman spectroscopy (FT-Raman), 29Si cross-polarization magic angle spinning nuclear magnetic resonance spectroscopy (29Si CPMAS NMR), 13C CPMAS NMR, 1H MAS NMR, thermogravimetric (TGA) analyses, transmission electron microscopy (TEM) and powder X-ray diffraction (XRD). Sulfonic acid functionalized zeolite BEA nanocrystals have proton conductivities in the range of 1.2Â ÃÂ 10â3-1.2Â ÃÂ 10â2Â S/cm compared to 1.5Â ÃÂ 10â4Â S/cm for unfunctionalizated zeolite BEA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 80, Issues 1â3, 2 May 2005, Pages 347-356
Journal: Microporous and Mesoporous Materials - Volume 80, Issues 1â3, 2 May 2005, Pages 347-356
نویسندگان
Brett A. Holmberg, Son-Jong Hwang, Mark E. Davis, Yushan Yan,