1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 PR China
2. National Energy Center for Coal to Liquids; Synfuels CHINA Co., Ltd; Huairou District Beijing 101400 PR China
3. Artie Mc Ferrin Dept. of Chemical Engineering; Texas A & M University; College Station TX 77843-3122 USA