.1,2 The cluster catalysts were characterized using electron microscopy (SEM and STEM), X...-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), diffuse reflectance....; Wei, X.W.; Vernieres, J.; Hu, K.-J.; Heggen , M.; Borkowski, R.D.; Palmer, R.E.; Laasonen, K...