The retarding effect o f carbon m onoxide is due to the adsorption o f the gas on the reaction sites, the heat given out in the change being 46 kcal. On the basis o f this value, which implies that the molecule is adsorbed chemically, it is possible to calculate theoretically the order of magnitude of the retardation constant, k2. I n t r o d u c t i o nThis investigation form s p a rt of a com prehensive stu d y of th e reactions of th e steam -carbon system . The effect on th e separate reactions of changes in th e p a rtial pressures of th e gases has been described in a previous p ap er (Gadsby, H inshelw ood & Sykes 1946), in which th e general in te rp re ta tio n of th e m ain kinetic relationships was also discussed. In continuation of th is work, th e detailed m echanism o f th e reactions in w hich solid carbon is converted into gaseous carbon m onoxide has now been studied. The present p aper deals w ith th e results o btained for th e carbon dioxide-carbon reaction, an d an accom panying one w ith those for-th e steamcarbon reaction. O u t l i n e o f m e t h o dThe principle of th e m ethod is th e com plem entary use of b o th th e flow a n d th e sta tic techniques. The variatio n of th e ra te of reaction w ith th e p a rtia l pressures of
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