1. Key Laboratory for Green Chemical Technology of State Education Ministry, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P. R. China
2. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, P. R. China
3. General Motors
Global Research and Development, Chemical Sciences and Materials Systems
Lab, 3500 Mound Road, Warren, Michigan 48090, United States