Abstract
The oxygen content of promoter oxides or other metallic oxide on the surface of iron synthetic ammonia catalysts has been estimated by a method involving equilibration with a known quantity of H 2 18O in hydrogen at 450 °C. The results indicate a surface coverage by promoters of about 60% for a catalyst containing 1.06% Al 2O 3 and 0.52% K 2O. With reasonable assumptions in regard to the cross sectional area of oxygen ions the coverage agrees with that estimated from the chemisorption of carbon monoxide at −195 °C on the same catalyst. A pure iron catalyst revealed only a 1.2% coverage with oxygen after extended reduction at 450 °C.
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