کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1333270 979072 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Porous properties of silylated mesoporous silica and its hydrogen adsorption
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Porous properties of silylated mesoporous silica and its hydrogen adsorption
چکیده انگلیسی

Porous properties of mesoporous silica silylated with various organic silanes were examined and their hydrogen adsorption properties were measured at 77 K. By silylation of the mesoporous silica, the specific surface area, pore radius and pore volume steeply decreased depending on both the size of the silane and the amount actually incorporated into the mesoporous framework. The pores reduced in size depending on the amount of modifying silane and vanished completely in the samples silylated with 3-aminopropyltriethoxysilane and phenyltrichlorosilane. Hydrogen adsorption isotherms of the silylated samples were measured at 77 K. With the exception of the sample with phenyltrichlorosilane, hydrogen adsorption volumes were proportional to the surface area with a slope of around 1.1 molecules/nm2. On the other hand, for the sample treated with phenyltrichlorosilane, a large hydrogen adsorption volume of around 38.1 molecules/nm2 was obtained. On heating the silylated compounds at 500 °C, micropores formed and the hydrogen adsorption volume increased by 1.5 times or more due to the development of micropores.

Dependence of amount of adsorbed H2 per organic component on surface area per organic component. Their intercept and slope indicate strength of physicochemical interaction and physisorption. Phenyl groups modified on mesoporous silica show the stronger physicochemical interaction than other functional groups for H2 adsorption .Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 180, Issue 4, April 2007, Pages 1180–1187
نویسندگان
, , , , ,