کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10632033 | 992381 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Catalytic oxidation of carbon monoxide over radiolytically prepared Pt nanoparticles supported on glass
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Platinum nanoparticles have been prepared by radiolytic and chemical methods in the presence of stabilizer gelatin and SiO2 nanoparticles. The formation of Pt nanoparticles was confirmed using UV-vis absorption spectroscopy and transmission electron microscopy (TEM). The prepared particles were coated on the inner walls of the tubular pyrex reactor and tested for their catalytic activity for oxidation of CO. It was observed that Pt nanoparticles prepared in the presence of a stabilizer (gelatin) showed a higher tendency to adhere to the inner walls of the pyrex reactor as compared to that prepared in the presence of silica nanoparticles. The catalyst was found to be active at â¥150 °C giving CO2. Chemically reduced Pt nanoparticles stabilized on silica nanoparticles gave â¼7% CO conversion per hour. However, radiolytically prepared Pt nanoparticles stabilized by gelatin gave â¼10% conversion per hour. Catalytic activity of radiolytically prepared platinum catalyst, coated on the inner walls of the reactor, was evaluated as a function of CO concentration and reaction temperature. The rate of reaction increased with increase in reaction temperature and the activation energy for the reaction was found to be â¼108.8 kJ molâ1. The rate of CO2 formation was almost constant (â¼1.5 Ã 10â4 mol dmâ3 hâ1) at constant O2 concentration (6.5 Ã 10â3 mol dmâ3) with increase in CO concentration from 2 Ã 10â4 mol dmâ3 to 3.25 Ã 10â3 mol dmâ3. The data indicate that catalytic oxidation of CO takes place by Eley-Rideal mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 40, Issue 10, 6 October 2005, Pages 1654-1661
Journal: Materials Research Bulletin - Volume 40, Issue 10, 6 October 2005, Pages 1654-1661
نویسندگان
S. Kapoor, A.D. Belapurkar, J.P. Mittal, T. Mukherjee,