1. Inner Mongolia Key Laboratory of Coal Chemical Engineering & Comprehensive Utilization, School of Chemistry and Chemical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, P. R. China
2. School of Mechanical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, Inner Mongolia, P. R. China
3. School of Engineering Science, University of Chinese Academy of Sciences, 19A Yu-quan-lu Road, Shijingshan District, Beijing 100049, P. R. China