کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7705330 | 1497293 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen storage properties of the novel crosslinked UiO-66-(OH)2
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Metal organic frameworks (MOF) are a type of nanoporous materials with large specific surface area, which are especially suitable for gas separation and storage. In this work, we report a new approach of crosslinking UiO-66-(OH)2 to enhance its hydrogen storage capacity. UiO-66-(OH)2 was synthesized using hafnium tetrachloride (HfCl4) and 2, 5-dihydroxyterephthalic acid (DTPA) through a canonical modulated hydrothermal method (MHT), followed by a post-synthesis modification, which is to form a crosslinking structure inside the porous structure of UiO-66-(OH)2. During the modification process, the phenolic hydroxyl groups on the UiO-66-(OH)2 reacted with methanal, and HCl aqueous solution and triethylamine served as catalyst (the products denoted as UiO-66-H and UiO-66-T, respectively). Powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), 13C nuclear magnetic resonance spectroscopy (13C NMR) proved that the crosslinking was formed. The BET specific surface area and the average adsorption pore size of UiO-66-H and UiO-66-T significantly increased after modification. The hydrogen storage capacity of UiO-66-H reached a maximum of 3.37Â wt% (16.87Â mmol/g) at 77Â K, 2Â MPa. Hydrogen adsorption enthalpy of UiO-66-T was 0.986Â kJ/mol, which was higher than that of UiO-66-(OH)2 (0.695Â kJ/mol). This work shows that UiO-66-(OH)2 is a promising candidate for potential application in high-performance hydrogen storage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 32, 9 August 2018, Pages 15370-15377
Journal: International Journal of Hydrogen Energy - Volume 43, Issue 32, 9 August 2018, Pages 15370-15377
نویسندگان
Saisai Chen, Jin Liu, Yongfei Xu, Zhen Li, Tai Wang, Jiong Xu, Zhuo Wang,