1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou, Henan, China;
2. Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining & Technology, Xuzhou, Jiangsu, China;
3. Key Laboratory of Energy Resources and Chemical Engineering, Institute of Chemistry and Chemical Engineering, Ningxia University, Yinchuan Shi, Ningxia Huizuzizhiqu, China