کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6747757 | 1429515 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Free radicals, apparent activation energy, and functional groups during low-temperature oxidation of Jurassic coal in Northern Shaanxi
ترجمه فارسی عنوان
رادیکال های آزاد، انرژی فعال ظاهری و گروه های کاربردی در طی اکسیداسیون کم دما از زغال سنگ ژوراسیک در شمال شانشی
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کلمات کلیدی
تمرکز آزاد نژادی، گروه های عاملی، اکسیداسیون کم دما، عامل لند، انرژی فعال ظاهری،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی اقتصادی
چکیده انگلیسی
Correlations among free radicals, apparent activation energy, and functional groups during low-temperature oxidation of Jurassic coal in Northern Shaanxi were investigated by examining three coal samples collected from the Ningtiaota, Jianxin, and Shigetai coal mines. Free radical concentrations at less than 120â¯Â°C were investigated by electron spin resonance experiments while the thermogravimetric experiments were conducted to analyze apparent activation energies. In addition, Fourier transform infrared spectroscopy was employed to study the spectrum of functional groups generated in coal. The results indicated that, in decreasing order, the apparent activation energies were Shigetaiâ¯>â¯Jianxinâ¯>â¯Ningtiaota, indicating that, from 50 to 120â¯Â°C, the Ningtiaota coal sample most easily absorbed and reacted with oxygen while the most resistant was the Shigetai coal sample. Free radical concentrations and line heights increased with increased temperature, and the line width and Lande factor showed irregular fluctuations. Functional group variations were different among these coals, and the phenol and alcohol-associated OHs, carboxyls, and aromatic ring double bonds might have had a major impact on free radical concentrations. These results were meaningful for better consideration and management of coal oxidation at low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mining Science and Technology - Volume 28, Issue 3, May 2018, Pages 469-475
Journal: International Journal of Mining Science and Technology - Volume 28, Issue 3, May 2018, Pages 469-475
نویسندگان
Wang Caiping, Xiao Yang, Li Qingwei, Deng Jun, Wang Kai,