The effect of the extent of oxidation of copper on the activity for co-oxidation A.J. van Dillen, J.W. Geus, K.P. de Jong and J. Van Der Meijden J. Chim. Phys., 78 (1981) 979-986 Published online: 29 May 2017 DOI: 10.1051/jcp/1981780979