Reaction kinetics and internal diffusion of Zhundong char gasification with CO2

Liu, Yun; Qu, Jiangyuan; Wu, Xuehui; Zhang, Kai; Zhang, Yuan

doi:10.1007/s11705-020-1949-2

Cited by 6 publications

(3 citation statements)

References 42 publications

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“…• Negligible diffusional resistance. For the conditions of the CO 2 activation process in this work with temperatures below 800 • C and a mean particle size under 200 μm characteristic of the kinetic control regime (zone I), Thiele modulus values below 0.2 have been obtained, confirming that the influence of diffusion phenomena is negligible [35][36][37][38][39]. Consequently, the hypothesis of a purely kinetic regime is assumed in the modeling.…”

Section: Model Definition Validation and Discussionsupporting

confidence: 63%

Modeling of the Evolution of the Porous Structure During a Physical Activation Process for the Production of Activated Biocarbon: A Novel Low Conversion Approach

Ranz¹,

Gil²,

Cortés

et al. 2023

Preprint

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Section: Model Definition Validation and Discussionsupporting

confidence: 63%

Modeling of the Evolution of the Porous Structure During a Physical Activation Process for the Production of Activated Biocarbon: A Novel Low Conversion Approach

Ranz¹,

Gil²,

Cortés

et al. 2023

Preprint

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“…[2][3][4] Due to release tendency of sodium species at high temperatures, sodium-rich coals have been attracting coal-related research interest in recent years. [5][6][7] As stated, sodium species tend to volatilize at high temperatures, which can bring about many serious ash-related problems inside reactors. 8 Due to this characteristic, sodium-rich coals have been widely investigated in coal combustion, 9,10 coal pyrolysis, 11,12 and coal gasification for better utilization.…”

Section: Introductionmentioning

confidence: 99%

“…One feature of sodium‐rich coals is that the sodium species in them can be easily released during thermal processes 2‐4 . Due to release tendency of sodium species at high temperatures, sodium‐rich coals have been attracting coal‐related research interest in recent years 5‐7 . As stated, sodium species tend to volatilize at high temperatures, which can bring about many serious ash‐related problems inside reactors 8 .…”

Section: Introductionmentioning

confidence: 99%

Structural changes of Zhundong coal matrix induced by thermal treatment and its effects on oil yield in direct coal liquefaction

Han

2021

Intl J of Energy Research

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Sodium-rich coals are suitable raw materials for direct coal liquefaction (DCL).However, sodium species in coals, especially exchangeable ones, can significantly reduce oil yield. In this work, to increase oil yield in direct liquefaction of sodium-rich coals, a feasible method using organic solvents to pretreat sodium-rich coals is proposed. Initially, sodium-rich coal was thermally treated with tetralin or 1-methylnaphtalene. Then, raw coal and all the treated coals were liquefied under the same conditions to evaluate the effects of thermal treatment on structural changes of coal molecules and oil yield. The results show that surface areas of the treated coals increased to 7.86 m 2 /g at most, which was favorable for combination between hydrogen and coal molecules during the DCL process. More importantly, the content of hydrogen in the treated coals was 0.95 wt% higher than that of raw coal on average, suggesting that treated coals could be later liquefied at mild conditions. Raman spectra demonstrated that during thermal treatment with tetralin, small aromatic ring systems in raw coal were prehydrogenated and transformed into nonaromatic systems. The pre-hydrogenation of the coal matrix definitely contributes to the increase in oil yield. In view of sodium species distribution in the treated coals, it is proved that tetralin can promote the transformation of exchangeable sodium species into other chemical forms more easily than 1-methylnaphtalene, which implies that tetralin has more positive effects on the increase of oil yield. Compared with that of raw coal, oil yields in direct liquefaction of the samples treated by tetralin increase by 14.0 to 15.1 wt% (daf).

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Diffusion process in enzyme—metal hybrid catalysts

Cui

2022

Front. Chem. Sci. Eng.

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Reaction kinetics and internal diffusion of Zhundong char gasification with CO2

Cited by 6 publications

References 42 publications

Modeling of the Evolution of the Porous Structure During a Physical Activation Process for the Production of Activated Biocarbon: A Novel Low Conversion Approach

Modeling of the Evolution of the Porous Structure During a Physical Activation Process for the Production of Activated Biocarbon: A Novel Low Conversion Approach

Structural changes of Zhundong coal matrix induced by thermal treatment and its effects on oil yield in direct coal liquefaction

Diffusion process in enzyme—metal hybrid catalysts

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