کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1490827 | 992334 | 2010 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Studies of the factors effecting the preparation of heterogeneous platinum-based catalyst on silica supports
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Pt nanoparticles with an average size of â¼3Â nm were successfully immobilized on the surface of SiO2 functionalized with -NH2 and -SH groups through chemical reduction process using polyvinylpyrrolidone as a stabilizer and different reducing agents. The effects of molecular weight of polyvinylpyrrolidone, molar ratio of reducing agent to Pt salt, type of reducing agent on the size and degree of agglomeration of Pt nanoparticles on the SiO2 surface were investigated. The X-ray diffraction and transmission electron micrograph analyses were performed to identify the product phase, size and morphology of immobilized Pt onto SiO2. UV-vis analysis was also conducted to identify the degree of reduction of Pt ions. The Pt-SiO2 nanocomposite prepared from both NH2- and SH-functionalized SiO2 exhibited similar behavior. The number of immobilized Pt nanoparticles and their average size was increased with polyvinylpyrrolidone concentration while the number of immobilized Pt was decreased with its molecular weight.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 45, Issue 10, October 2010, Pages 1419-1425
Journal: Materials Research Bulletin - Volume 45, Issue 10, October 2010, Pages 1419-1425
نویسندگان
Chang Young Kim, Chi-Young Jung, Jae-Woong Jung, Sung Hoon Jeong, Sung-Chul Yi, Wha Jung Kim,