1. School of Chemical EngineeringBeijing Institute of Petrochemical Technology Beijing 102617 P.R. China
2. School of Chemical EngineeringBeijing University of Chemical Technology Beijing 100029 P.R. China
3. Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction TechnologyBeijing Institute of Petrochemical Technology Beijing 102617 P.R. China