1. Operando Molecular Spectroscopy and Catalysis Laboratory, Department of Chemical Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Republic of China, and Catalysis Research Center, Hokkaido University, N-11, S-10, Kita-ku, Sapporo 060-0811, Japan