Characteristics of reactivity and structures of palm kernel shell (PKS) biochar during CO 2 /H 2 O mixture gasification: Guozhang Chang 1,2, Ximin Yan 2, Pengyu Qi 2, Mei An 1, Xiude Hu 1, Qingjie Guo 1,2: 1 State Key Laboratory of Highefficiency Coal Utilization and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China;