1. School of Chemical Engineering, Northwest University, Xi’an, PR China
2. The Research Center of Chemical Engineering Applying Technology for Resource of Shaanxi, Xi’an, PR China
3. School of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization, Yulin University, Yulin, PR China
4. Shaanxi Yulin Energy Group Co., Ltd, Yulin, PR China