Decoupling of volatile–char interaction in co-pyrolysis of cow manure and bituminous coal and deactivation mechanism of coal char reactivity

Meng Ma, Jiaofei Wang, Yonghui Bai, Peng Lv, Xudong Song, Weiguang Su, Juntao Wei and Guangsuo Yu

Energy, 2022, vol. 251, issue C

Abstract: In this study, the volatile–char interaction in coal and cow manure co-pyrolysis process was decoupled by adding internals in a two-stage fixed bed reactor, and the effect of vapor-residence time on coal char reactivity at 850 °C was investigated. The results indicated that the volatile–char interaction inhibited coal char reactivity, but the inhibition showed an opposite rule with the vapor-residence time in different co-pyrolysis modes. The reformed gas-phase volatiles entered the macromolecular framework of coal and generated PAHs, increasing the aromatization degree and large aromatic rings numbers of char, resulting in the reduction of the O-containing functional groups and the behavioral effects of C–O and CO being particularly pronounced. The interaction promoted the release of Na/K, and the release behavior changed when only volatile−volatile interaction existed in the co-pyrolysis samples. The reduction of O-containing functional groups resulted in the loss of active sites number after the interaction, AAEM showed limited catalytic behavior. The O-containing functional groups and cross-linking structure act as active sites in the interaction process. This work is beneficial to enrich and develop the synergistic transformation theoretical system of carbon-containing energy materials, and provides theoretical support for promoting the industrial application of related technologies.

Keywords: Co-pyrolysis; Volatile–char interaction; Reactivity; AAEM; Chemical structure (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:251:y:2022:i:c:s0360544222007940

DOI: 10.1016/j.energy.2022.123891

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