Iron is not used alone as a catalyst in ammonia synthesis, because___________________?
Correct answer: C. Its activity declines rapidly, if heated to above 520°C
- A. It gets oxidised above 500°C
- B. It decomposes ammonia
- C. Its activity declines rapidly, if heated to above 520°C
- D. None of these
Explanation
Unpromoted iron loses catalytic activity rapidly when heated above roughly 520°C because of sintering and loss of active surface. Industrial ammonia catalysts therefore use promoters such as potassium and alumina.
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