کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5134625 1492953 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characteristics of softwood and hardwood pyrolysis in an ampoule reactor
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Characteristics of softwood and hardwood pyrolysis in an ampoule reactor
چکیده انگلیسی


- Hardwoods produce larger amounts of volatiles instead of char.
- Hardwood tar-to-gas conversion was slower because of higher acetic acid content.
- Syringyl-derived lignin tar disappears in early secondary reaction stage.
- Removing minerals changes tar compositions, which enhances gas formation.
- By removing minerals, significant coking occurs from hardwood primary tar.

Characteristics of softwood and hardwood pyrolysis were identified by using 10 wood species with different chemical compositions depending on their taxonomic group. Pyrolysis was conducted in closed ampoules under nitrogen in a muffle furnace at 600 °C for 40 s (459 °C), 80 s (569 °C), 120 s (590 °C) and 600 s (600 °C) (where the value in parenthesis is the final temperature). The pyrolysis results are explained according to primary pyrolysis (PP; 40 s) and secondary reaction (SR; 40-600 s) stages. Hardwoods formed more volatiles (tar) instead of char in the PP stage, and the char reactivities were greater than those of the softwoods in the SR stage. The tar-to-gas conversion rates in the SR stage were smaller for the hardwoods, most likely because of the higher contents of acetic acid with low gasification reactivity. Significant coking occurred for the hardwood-derived tar by removing minerals, which competed with tar gasification. The influences of minerals are discussed with metal uronate and uronic acid in hemicellulose, which may act as base and acid catalysts, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Analytical and Applied Pyrolysis - Volume 124, March 2017, Pages 523-535
نویسندگان
, , ,