کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7606639 | 1492964 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Catalytic depolymerization of lignin macromolecule to alkylated phenols over various metal catalysts in supercritical tert-butanol
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Three technical lignins (Asian lignin (AL), Organosolv lignin (OL), and Inbicon lignin (IL)) were selectively degraded to alkylated phenols (AP) over Pt/C, Pd/C, Ru/C, and Ni/C in supercritical t-BuOH. AP and other phenolics present in the lignin depolymerized oil fraction (lignin-oil) were subjected to several chemical analyses. GC/MS analysis showed AL yielded a maximum of 1.40 wt% of 4-ethylphenol and 4-ethylguaiacol, while OL produced 1.89, 1.11, and 1.43 wt% of syringol, 4-methylsyringol and 4-propylsyringol, respectively under Pt/C condition. Relatively small amounts of AP were obtained from IL because it contained not only lignin moiety but also carbohydrate, ash, and other components. Meanwhile, the average molecular weights (Mw) of the lignin-oils were significantly lower than those of the lignins, clear evidence of lignin depolymerization. Moreover, elemental analysis indicated hydrodeoxygenation mainly occurred during lignin depolymerization. With increasing catalyst amount (Pt/C), total monomeric phenol yields decreased due to side reaction, but some kind of AP such as 4-ethylphenol and 4-ethylguaiacol showed increase trend with increasing catalyst amount.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 113, May 2015, Pages 99-106
Journal: Journal of Analytical and Applied Pyrolysis - Volume 113, May 2015, Pages 99-106
نویسندگان
Jae-Young Kim, Jeesu Park, Hyewon Hwang, Jeong Kwon Kim, In Kyu Song, Joon Weon Choi,