1. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China
2. Lanzhou Petrochemical Research Center, Petrochemical Research Institute, PetroChina Company Limited, Lanzhou 730060, P. R. China
3. Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou 730050, Gansu, China