کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
59714 1419442 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-temperature graphitization of amorphous carbon nanospheres
ترجمه فارسی عنوان
گرافیتیزاسیون با دمای پایین از نانوسفرهای کربن آمورف
کلمات کلیدی
تجزیه و تحلیل، نانوسرهای کربن، اختلال ساختاری کربن
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی

The investigation by SEM/TEM, porosity, and X-ray diffraction measurements of the graphitization process starting from amorphous carbon nanospheres, prepared by glucose carbonization, is reported. Aspects studied are the annealing temperature in the 750–1000 °C range, the type of inert carrier gas, and time of treatment in the 2–6 h range. It is investigated how these parameters influence the structural and morphological characteristics of the carbon materials obtained as well as their nanostructure. It is shown that it is possible to maintain after graphitization the round-shaped macro morphology, a high surface area and porosity, and especially a large structural disorder in the graphitic layers stacking, with the presence of rather small ordered domains. These are characteristics interesting for various catalytic applications. The key in obtaining these characteristics is the thermal treatment in a flow of N2. It was demonstrated that the use of He rather than N2 does not allow obtaining the same results. The effect is attributed to the presence of traces of oxygen, enough to create the presence of oxygen functional groups on the surface temperatures higher than 750 °C, when graphitization occurs. These oxygen functional groups favor the graphitization process.

Graphical AbstractThis study shows the possibility to graphitize amorphous carbon nanospheres, prepared by glucose carbonization, maintaining the round-shaped macro morphology, high surface area and porosity, and especially a large structural disorder in the graphitic layers stacking.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chinese Journal of Catalysis - Volume 35, Issue 6, June 2014, Pages 869–876
نویسندگان
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