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Microwave-assisted co-pyrolysis of brown coal and corn stover for oil production

Zhang, Yaning, Fan, Liangliang, Liu, Shiyu, Zhou, Nan, Ding, Kuan, Peng, Peng, Anderson, Erik, Addy, Min, Cheng, Yanling, Liu, Yuhuan, Li, Bingxi, Snyder, John, Chen, Paul, Ruan, Roger
Bioresource technology 2018 v.259 pp. 461-464
acids, aldehydes, biomass, coal, corn, corn stover, esters, hydrocarbons, ketones, microwave treatment, oils, phenols, pyrolysis, synergism, temperature
The controversial synergistic effect between brown coal and biomass during co-pyrolysis deserves further investigation. This study detailed the oil production from microwave-assisted co-pyrolysis of brown coal (BC) and corn stover (CS) at different CS/BC ratios (0, 0.33, 0.50, 0.67, and 1) and pyrolysis temperatures (500, 550, and 600 °C). The results showed that a higher CS/BC ratio resulted in higher oil yield, and a higher pyrolysis temperature increased oil yield for brown coal and coal/corn mixtures. Corn stover and brown coal showed different pyrolysis characteristics, and positive synergistic effect on oil yield was observed only at CS/BC ratio of 0.33 and pyrolysis temperature of 600 °C. Oils from brown coal mainly included hydrocarbons and phenols whereas oils from corn stover and coal/corn mixtures were dominated by ketones, phenols, and aldehydes. Positive synergistic effects were observed for ketones, aldehydes, acids, and esters whereas negative synergistic effects for hydrocarbons, phenols and alcohols.