Characteristics of reactivity and structures of palm kernel shell (PKS) biochar during CO_2/H_2O mixture gasification

作     者：Guozhang Chang Ximin Yan Pengyu Qi Mei An Xiude Hu Qingjie Guo 

作者机构：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 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2018年第26卷第10期

页      面：2153-2161页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 081701[工学-化学工程] 

基　　金：Supported by the Key Project of the Natural Science Foundation of Shandong Province(ZR2015QZ02) the Key Research&Development Program of Shandong Province(2016GSF117005) the introduction of scientific and technological innovation team of Ningxia Hui Autonomous Region(2016) Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2017-K22) 

主　　题：Palm kernel shell Reactivity Pore structure Carbon ordering degree CO2/intermittent H2O gasification 

摘      要：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.