1. Department of Chemical Engineering, University of Michigan, 3230 H.H. Dow Building, 2300 Hayward Avenue, Ann Arbor, Michigan 48109-2136, Instituto Mexicano del Petroleo, Eje Central Lazaro Cardenas 152, Mexico City, DF 07730, Mexico, and Fuel Science Program, Department of Energy and Geo-Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802