LI Jia-Xuan1, SHI Jing-Zhu1, WEN Li-Quan2, SHI Ke-Ren3, LIU Hong-Yun1**
1. College of Chemistry, Beijing Normal University, Beijing 100875, China;
2. Beijing No.2 Middle School, Beijing 100010, China;
3. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021,China