کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7606542 1492949 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reactive carbons from Kraft lignin pyrolysis: Stabilization of peroxyl radicals at carbon/silica interface
ترجمه فارسی عنوان
کربن فعال واکنشگر از کرافت لیگنین پیرولیز: تثبیت رادیکال های پراکسیل در رابط کربن / سیلیکا
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Lignin, the most abundant aromatic natural polymer and the second richest source of organic raw material, is considered as a potential source of energy, chemicals and carbon-based materials. In this work we have investigated the nature and reactivity of sp2 carbons obtained by the pyrolysis of soluble Kraft lignin, a byproduct of paper making process. The formation of carbons from Kraft lignin deposited onto high surface area silica was studied by vacuum pyrolysis at different temperatures, using pristine and acid-washed lignin. Among the various techniques adopted for the material characterization, the Raman measurements showed that the procedure successfully yields carbon atoms organized in sp2 domains, on the surface of silica, whose dimensions are sub-micrometric. The identification of a very stable peroxyl radical onto carbon-modified silica represents a major result, because these species are known to be usually transient. The observed peroxyl radicals are detectable only when both pyrolytic carbon and silica are present. The reactions of pyrolytic carbon onto silica with oxygen and nitrogen monoxide were studied by electron paramagnetic resonance (EPR). The kinetics and reversibility of the reaction with oxygen, as well as the reaction with nitrogen monoxide, were investigated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 128, November 2017, Pages 346-352
نویسندگان
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