Thermogravimetric characteristics and kinetics of herb residues catalyzed by potassium carbonate

Abstract

Thermal conversion technology of Chinese herb residues (CHR) becomes one of the most promising technologies in the large-scale clean utilization of herb residues due to its short process and high efficiency. In this study, non-isothermal thermogravimetric analysis of CHR samples without and with K2CO3 (5%K- 9%K) was implemented at 300-1125 K and the heating rates of 10-40 K/min. A model-free Starink method was applied to evaluate the thermal decomposition behavior and apparent activation energy (Eα) values. The estimated average activation energy decreases from 206.3 kJ/mol of raw CHR to 143.8-160.6 kJ/mol of CHR with K2CO3. K2CO3 catalysts significantly promote the catalytic pyrolysis reaction of the hemicellulose and cellulose of CHR samples at the main devolatilization stage from 425 K to 700 K with over 82.02% mass loss. The pyrolysis temperature of the raw CHR is higher than traditional lignocellulosic biomass without decoction. By using the generalized master-plots method, it was found that the CHR pyrolysis could be described by a modified Dn-Jader model, but values of n and A tend to change measurably with heating rates for the CHR samples with catalysts due to the remarkably catalytic effect of K2CO3.

Publication DOI: https://doi.org/10.1016/j.jaap.2021.105170
Divisions: College of Engineering & Physical Sciences > School of Infrastructure and Sustainable Engineering > Chemical Engineering & Applied Chemistry
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
College of Engineering & Physical Sciences
Additional Information: © 2021, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: Catalytic pyrolysis,Herb residues,Kinetic analysis,Potassium carbonate,Thermogravimetry,Analytical Chemistry,Fuel Technology
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Related URLs: https://www.sci ... 156X?via%3Dihub (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2021-06
Published Online Date: 2021-04-25
Accepted Date: 2021-04-18
Authors: Zhu, Hongyu
Lang, Lin
Fang, Gang
Na, Dingying
Yin, Xiuli
Yu, Xi (ORCID Profile 0000-0003-3574-6032)
Wu, Chuangzhi
Bridgwater, Anthony V. (ORCID Profile 0000-0001-7362-6205)

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Version: Accepted Version

Access Restriction: Restricted to Repository staff only until 25 April 2022.

License: Creative Commons Attribution Non-commercial No Derivatives


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