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Free-radical behaviors of co-pyrolysis of low-rank coal and different solid hydrogen-rich donors: A critical review

热解 化学 废物管理 热解油 煤液化 化学工程 有机化学 工程类
作者
Lei Wu,Yining Guan,Changcong Li,Lei Shi,Shengqiang Yang,B. Rajasekhar Reddy,Gan Ye,Qiuli Zhang,Rock Keey Liew,Jun Zhou,R. Vinu,Su Shiung Lam
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:474: 145900-145900 被引量:5
标识
DOI:10.1016/j.cej.2023.145900
摘要

Low-cost and accessible “hydrogen source” are the key to reducing the cost of coal hydropyrolysis technology. The mechanism of hydrogen supply is a crucial scientific issue in this technology. Solid “hydrogen-rich” donors, such as biomass, waste plastics, oil shale, and coal liquefaction residue, possess favorable characteristics such as affordability, abundant availability, high volatility and a high H/C ratio, which are considered ideal solid “hydrogen sources” for coal hydropyrolysis. The co-pyrolysis reactions between low-rank coal and solid “hydrogen donor” follow the mechanism of free radical reactions. Moreover, a clear investigation of the free-radical behaviors and synergistic interactions between them can clarify the hydrogen supply mechanism in the co-pyrolysis process of solid “hydrogen-rich” donors, resulting in the controlled production of high-quality oil and gas products. This review systematically summarizes the free-radical behaviors during the co-pyrolysis of low-rank coal and solid “hydrogen-rich” donors: Three detection methods of free radicals and their applications are first introduced. Then, the factors influencing the free-radical behaviors during the co-pyrolysis are discussed, and the influences of the free-radical behaviors on the products obtained by the co-pyrolysis are analyzed. Finally, the results and challenges of free-radical behaviors are outlined. This work is intended to provide a comprehensive and scientific basis for completing the mechanism of free-radical reactions in the co-pyrolysis of low-rank coal and solid “hydrogen-rich” donors.
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