Campus Units

Chemistry

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

10-24-2018

Journal or Book Title

Journal of Analytical and Applied Pyrolysis

DOI

10.1016/j.jaap.2018.10.017

Abstract

Despite recent advances, little has been experimentally established regarding the detailed chemical processes that occur during biomass pyrolysis reactions. We developed a new technique that allows for the monitoring of each molecular product from fast pyrolysis with ∼0.2 s temporal resolution. This was achieved by directly coupling a micropyrolyzer with a time-of-flight mass spectrometer via a soft ionization. Molecular products studied were produced in thin-film pyrolysis of a series of glucose-based carbohydrates. Unprecedented details of the pyrolysis reaction process were revealed, including the timescale of molecular product formation and the existence of metastable intermediates. Small carbohydrates are completely pyrolyzed within one second and as short as one-half second for glucose pyrolysis. Individual time profiles could be extracted and examined for each molecular product. Additionally, the effect of sample dimensions on the pyrolysis of cellulose and α-cyclodextrin, as both thin films and particles, was studied. A surprising time delay of one second is observed for the thin-film pyrolysis of cellulose and α-cyclodextrin, which is attributed to the transition to the molten phase. When a large amount of cellulose or α-cyclodextrin is pyrolyzed, random fluctuations of temporal profiles are observed and explained as coming from aerosol ejections. This is well correlated with the high abundance of non-volatile products such as cellobiosan that cannot be detected in typical GC–MS or pyrolysis GC–MS analysis.

Comments

This is a manuscript of an article published as Hutchinson, Carolyn P., D. Paul Cole, Erica A. Dalluge, Evan A. Larson, and Young Jin Lee. "Novel Instrumentation for Tracking Molecular Products in Fast Pyrolysis of Carbohydrates with Sub-Second Temporal Resolution." Journal of Analytical and Applied Pyrolysis (2018). DOI: 10.1016/j.jaap.2018.10.017. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Available for download on Saturday, October 24, 2020

Published Version

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