Millisecond Pulsed Films Unify the Mechanisms of Cellulose Fragmentation
Journal Article
·
· Chemistry of Materials
- Univ. of Minnesota, Minneapolis, MN (United States); University of Minnesota
- Univ. of Washington, Seattle, WA (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
The mechanism of crystalline cellulose fragmentation has been debated between classical models proposing end-chain or intrachain scission to form short-chain (molten) anhydro-oligomer mixtures and volatile organic compounds. Models developed over the last few decades suggest global kinetics consistent with either mechanism, but validation of the chain-scission mechanism via measured reaction rates of cellulose has remained elusive. To resolve these differences, we introduce a new thermal-pulsing reactor four orders of magnitude faster than conventional thermogravimetic analysis (106 vs 102 °C/min) to measure the millisecond-resolved evolution of cellulose and its volatile products at 400–550 °C. By comparison of cellulose conversion and furan product formation kinetics, both mechanisms are shown to occur with the transition from chain-end scission to intrachain scission above 467 °C concurrent with liquid formation comprised of short-chain cellulose fragments.
- Research Organization:
- Univ. of Minnesota, Minneapolis, MN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012659
- OSTI ID:
- 1865816
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 9 Vol. 28; ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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