Structural and Mechanistic Requirements for Methane Activation and Chemical Conversion on Supported Iridium Clusters


  • This study was supported by BP as part of the Methane Conversion Cooperative Research Program at the University of California. Helpful technical discussions with Dr. John Collins and Dr. Theo Fleisch (BP) throughout these studies are gratefully acknowledged.


original image

The only kinetically relevant step for catalytic CH4 activation on Ir clusters is—according to a detailed analysis—C[BOND]H bond activation (see picture). This step is favored on surfaces of small Ir clusters supported on oxides, as also found on other noble metal catalysts. Other elementary steps remove chemisorbed carbon species rapidly and preserve essentially uncovered surfaces during catalysis.