1. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources College of Chemistry and Chemical EngineeringCentral South University Changsha 410083 P. R.China
2. State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Energy Environmental CatalysisBeijing University of Chemical Technology Beijing 100029 P. R. China
3. School of Chemistry and Chemical EngineeringUniversity of South China Hengyang, Hunan 421001 P. R. China