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- Title
Detailed assessment of hematite-promoted pyrolysis of corn straw: Gas products, reaction characteristics and thermo-kinetics.
- Authors
Zhang, Qiang; Sun, Yongsheng; Jin, Guojie; Cao, Yue; Han, Yuexin
- Abstract
The promoting effect of hematite on the pyrolysis of corn straw was investigated. Hematite significantly increased the production of CO 2 , CO, and H 2 during the fluidization roasting process, while its effect on CH 4 was unremarkable. Control experiments using quartz verified the promotion effect of hematite. Specifically, hematite promoted both active pyrolysis and polycondensation reactions of corn straw but did not remarkably affect its dehydration. By promoting the ring-opening reactions and continuous cracking of macromolecular intermediates, hematite allowed for higher yields of CO 2 , CO, H 2 , alcohols, phenols, esters, and ethers. Hematite also promoted the reforming reactions between CO 2 and CH 4 , as well as between H 2 O and CH 4 , resulting in an insignificant increase in CH 4 production. In the polycondensation stage, hematite exerted a notable deoxidation effect, inducing the conversion of oxygenated compounds into benzene series through processes such as cyclization and aromatization, while generating small molecule products. Hematite played a vital catalyst role in this process, as no significant reforming reaction occurred at this stage in the absence of hematite. Moreover, kinetic analysis demonstrated that hematite changed the reaction mechanism in the active pyrolysis stage and lowered the apparent activation energy by about 80 kJ/mol, thereby confirming its kinetic promotion effect. [Display omitted] • The promotion of hematite on the pyrolysis of corn straw was validated. • Hematite obviously increased the yield of CO 2 , CO and H 2 from straw pyrolysis. • The activation energy was significantly decreased after adding hematite
- Subjects
CORN straw; HEMATITE; RING-opening reactions; PYROLYSIS; CARBON dioxide; ACTIVATION energy; BENZENE compounds
- Publication
Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2024, Vol 203, p99
- ISSN
0263-8762
- Publication type
Article
- DOI
10.1016/j.cherd.2024.01.039