1. Beijing Key Laboratory for Green Catalysis and Separation
2. College of Environmental and Energy Engineering
3. Beijing University of Technology
4. Beijing 100124
5. P. R. China
6. Department of Chemistry
7. Nankai University
8. Tianjin 300071
9. School of Chemistry and Chemical Engineering
10. Tianjin University of Technology
11. Tianjin 300384
12. China