The kinetics of the oxygen exchange reaction between carbon dioxide and carbon monoxide were measured on iron, wu¨stite, and magnetite surfaces. This was done through the use of an isotope exchange technique. The measured rate constants are dependent on the oxygen activity. This dependence is expressed by k a = k o a O Àm . The parameter m was found to have values between 0 and 1. It was found that, in the iron region, the apparent rate constant was independent of the oxygen partial pressure (i.e., m = 0) at 1123 K (850°C) and that it was inversely dependent on the oxygen partial pressure (i.e., m = 1) for the magnetite region at 1123 K (850°C) and 1268 K (995°C). In the wu¨stite region, m was found to be equal to 0.51, 0.66, and 1.0 for the w 1 , w 2 , and w 3 pseudo phases, respectively, at 1268 K (995°C). At 1123 K (850°C), in wu¨stite, m was found to be equal to 0.59 and to 1.0 for the w 1 ¢ and w 3 ¢ pseudo phases, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.