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Characteristics of reactivity and structures of palm kernel shell (PKS) biochar during co_2/h_2o mixture gasification

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2153-2161页

作者： Guozhang Chang Ximin Yan Pengyu Qi Mei An Xiude hu Qingjie Guo State Key Laboratory of high-efficiency coal Utilization and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical Engineering Qingdao University of Science and Technology

Palm kernel shell(PKS)biochars with different levels of carbon conversion were initially prepared using a tube furnace,after which the reactivity of each sample was assessed with a thermogravimetric analyzer under a co_2 *** pore structure and carbon ordering of each biochar also examined,employing a surface area analyzer and a Raman *** results showed that the gasification index R_sof the PKS biochar decreased from 0.0305 min^(-1) at carbon conversion(x)=20% to 0.0278 min^(-1)at x=40%.The expansion of micropores was the dominant process during the pore structure evolution,ad mesopores with sizes ranging from 6 to 20,48 to 50 nm were primarily generated during gasification under a co_2/h_2o *** proportion of amorphous carbon in the PKS biochar decreased significantly as x increased,suggesting that the proportion of ordered carbon was increased during the co_2/h_2o mixed gasification.A significantly reduced total reaction time was observed when employing a co_2/intermittent h_2o process along with an 83.46% reduction in the steam feed,compared with the amount required using a co_2/h_2o atmosphere.

关键词： Palm kernel shell Reactivity Pore structure Carbon ordering degree co2/intermittent h2o gasification

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