1. Personnel Department , Henan Polytechnic University , Jiaozuo, Henan 454000 , China
2. College of Chemistry and Chemical Engineering , Henan Polytechnic University , Jiaozuo, Henan Province 454000 , China
3. Henan Key Laboratory of Coal Green Conversion , Henan Polytechnic University , Jiaozuo, Henan Province 454000 , China