کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7606377 | 1492947 | 2018 | 42 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Advanced characterization unravels the structure and reactivity of wood-based chars
ترجمه فارسی عنوان
مشخصه پیشرفته ساختار و واکنش پذیری ارقام چوب را بازتاب می دهد
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کلمات کلیدی
چوب چوب، مشخصات ساختاری، میکروسکوپ الکترونی، میکروتوموگرافی، طیف سنجی رامان، پراش اشعه ایکس،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
This study aims at understanding the structural changes occurring in the carbonaceous matrix of wood-based chars during their thermal conversion. Although chars are routinely characterized by porosity measurements or scanning electron microscopy, the composition and structure of the carbonaceous matrix is often not investigated. Here, advanced characterization using X-ray synchrotron microtomography, transmission electron microscopy, Raman spectroscopy and X-ray diffraction provided a precise description of the char properties, allowing for an accurate discussion of their catalytic properties. Two chars were produced by slow pyrolysis of wood waste (400 and 700â¯Â°C) and a third one was fabricated by activation under steam at 850â¯Â°C of the char obtained at 700â¯Â°C. The results show that the pyrolysis temperature and the activation performed did not affect the macrostructure of the chars and that the pores were interconnected at the macroscopic scale. However, at 700â¯Â°C, the micro- and nanostructures were modified: short-range organized graphene fringes were observed. The activated char showed a homogeneous microstructure similar to that of its precursor. Besides, the ratio of graphene-like structures, the local organization of graphene sheets, and the imperfections in graphene-like sheets were clearly improved by the post-treatment. To our knowledge, this is the first time that such an approach, combining various tools, is applied for the study of pyrolysis chars.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 130, March 2018, Pages 79-89
Journal: Journal of Analytical and Applied Pyrolysis - Volume 130, March 2018, Pages 79-89
نویسندگان
Sarah Berhanu, Maxime Hervy, Elsa Weiss-Hortala, Henry Proudhon, Marie-Hélène Berger, Anthony Chesnaud, Matthieu Faessel, Andrew King, Doan Pham Minh, Audrey Villot, Claire Gérente, Alain Thorel, Laurence Le Coq, Ange Nzihou,