بررسی قابلیت جذب هیدروژن در ماده مرکب نانو‌ساختار SBA-16-Pd
نویسندگان
چکیده مقاله:
The purpose of this work was to study the hydrogen adsorption on the surface of mesoporous materials based on silica (SBA-16) modified with palladium via temperature. Since mesoporous silica materials have a high specific surface area, and the ordered mesoporous size of 2-10nm, they are suitable for adsorption and storage of hydrogen. SBA-16 is suitable for this purpose due to its cubic crystalstructure and open pores. Single-stage sol-gel method was used to produce nanostructure composite from salt of palladium (PdCl3) and mesoporous silica precursor. The aging time was selected as 12 hr at 80˚C. Furthermore, the obtained materials were heated at 550˚C for 6 hr to remove surfactant and to form pores. Then the materials were characterized by large angle and small angle x-ray diffraction analysis, and hydrogen absorption analysis at upto 200kPa pressure at three different temperatures of -196˚C (77 K), -123˚C (150 K) and 30˚C (303 K). Furthermore, adsorption-desorption of nitrogen gas was studied. The surface morphology was observed by field emission scanning electron microscope (FESEM). In addition, the amount of palladium, oxygen, and silicon were measured by using energy dispersive spectroscopy) EDS ). Finally, the functional groups on the surface of mesoporous silica materials were evaluated using Fourier transform infrared spectroscopy (FTIR). The results of XRD and EDS analyses confirmed the presence of palladium and palladium oxide in mesoporous amorphous silica. In addition, BET results showed that addition of palladium in SBA-16 decreased the surface area, and produced 791 and 538m2/g for SBA-16 and SBA-16/Pd, respectively. Hydrogen absorption in nano structure composite was decreasing with temperatur in comparison with SAB-16. On the other hand, the maximum hydrogen absorption in the nano structure composite containing palladium was obtained at -196˚C (77 K).
منابع مشابه
بررسی قابلیت جذب هیدروژن در ماده مرکب نانو ساختار sba-۱۶-pd
در این پژوهش قابلیت جذب هیدروژن در مواد متخلخل پایه سیلیکاتی sba-16 اصلاحشده با فلز واسطه پالادیوم با دما مورد بررسی قرار گرفت. مواد متخلخل پایه سیلیکا به دلیل داشتن سطح ویژه مناسب و قابل کنترل بودن پراکندگی و اندازه تخلخلها در محدوده 2 تا 10 نانومتر، قابلیت جذب و ذخیرهسازی گاز هیدروژن را دارند. ماده متخلخل sba-16 به دلیل داشتن ساختار بلوری به شکل مکعب همراه با کانال های روباز برای این منظو...
متن کاملSol Gel-Derived SBA-16 Mesoporous Material
The aim of this article is to review current knowledge related to the synthesis and characterization of sol gel-derived SBA-16 mesoporous silicas, as well as a review of the state of the art in this issue, to take stock of knowledge about current and future applications. The ease of the method of preparation, the orderly structure, size and shape of their pores and control, all these achievable...
متن کاملVapour phase hydrogenation of phenol over rhodium on SBA-15 and SBA-16.
In the present work, mesoporous SBA-15 and SBA-16 were synthesised using classical methods, and their physicochemical properties were investigated by X-ray diffraction (XRD), FTIR, TEM and N2 adsorption-desorption. Rhodium (Rh, 1 wt %) was loaded on the mesoporous SBA-15 and SBA-16 by an impregnation method. The Rh surface coverage, dispersion and crystallite size were determined by room temper...
متن کاملControlling the window size in mesoporous SBA-16.
The structure of the mesoporous silica SBA-16 has been interrogated by careful elimination of the organic templating agent using ozone treatment. It is shown that the as-synthesised material consists of large cages connected by very narrow, ca. 7 Å, windows. These windows open up to about 20 Å following a calcination treatment that suggests that the functionality of SBA-16 could be changed mark...
متن کاملبررسی اثر غشاء سرامیکی pd/ag بر هیدروژن زدایی پروپان
هیدروژن زدایی کاتالیستی پروپان جهت تولید پروپیلن به عنوان ماده اولیه در تولید پلی پروپیلن برای کاربردهای مختلف اهمیت زیادی دارد. کاتالیست صنعتی pt-sn/γ–al2o3 در فرآیند هیدروژن زدایی پروپان بسیار فعال و گزینش پذیر عمل می کند. استفاده از راکتورهای غشایی روشی برای فائق آمدن بر محدودیت ترمودینامیکی این واکنش است. در این مطالعه، هیدروژن زدایی از پروپان در راکتور غشایی مطالعه شده است. در بخش اول این ...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ذخیره در منابع من قبلا به منابع من ذحیره شده{@ msg_add @}
عنوان ژورنال
دوره 34 شماره 3
صفحات 13- 27
تاریخ انتشار 2015-12
با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.
کلمات کلیدی برای این مقاله ارائه نشده است
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023