NDA
Bejelentkezés
Kapcsolat
Cellulose pyrolysis kinetics: Revisited |
Tartalom: | http://real.mtak.hu/21646/ |
---|---|
Archívum: | MTA Könyvtár |
Gyűjtemény: |
Status = Published
Type = Article |
Cím: |
Cellulose pyrolysis kinetics: Revisited
|
Létrehozó: |
Antal, Michael J.
Várhegyi, Gábor
Jakab, Emma
|
Dátum: |
1998
|
Téma: |
QD Chemistry / kémia
TP Chemical technology / vegyipar, vegyészeti technológia
|
Tartalmi leírás: |
In the same thermogravimetric analyzer (TGA) under identical conditions, samples of pure, ash-free cellulose (i.e. Avicel PH-105, Whatman CF-11, Millipore ash-free filter pulp, and Whatman #42) obtained from different manufacturers undergo pyrolysis at temperatures which differ by as much as 30 ?C. Thus the pyrolysis chemistry of a sample of pure cellulose is not governed by a universal rate law, as is the case with a pure hydrocarbon gas (for example). Nevertheless, the pyrolytic weight loss of all the samples studied in this work is well represented by a high activation energy (228 kJ/mol), first order rate law at both low and high heating rates. These results do not corroborate the recent findings of Milosavljevic and Suuberg (1995). For a particular cellulose sample (for example Avicel PH-105), variations in the pre-exponential constant determined at different heating rates reflect uncontrolled, systematic errors in the dynamic sample temperature measurement (thermal lag).
|
Típus: |
Article
PeerReviewed
|
Formátum: |
text
|
Azonosító: |
Antal, Michael J. and Várhegyi, Gábor and Jakab, Emma (1998) Cellulose pyrolysis kinetics: Revisited. INDUSTRIAL and ENGINEERING CHEMISTRY RESEARCH, 37. pp. 1267-1275. ISSN 0888-5885
|
Kapcsolat: |