Which of the following is the most suitable catalyst for ammonia synthesis ?
Correct answer: C. Fe in fused mixture of Al2O3 + SiQ2 + MgO
- A. Pt
- B. ZnO + Cr2O3
- C. Fe in fused mixture of Al2O3 + SiQ2 + MgO
- D. All of the above
Explanation
The Haber process uses finely divided iron as the catalyst, with metal oxides acting as promoters to improve its activity and stability. The promoted iron mixture in option c is therefore the intended catalyst system. Students may choose d by assuming that any substance sometimes used as a catalyst can replace iron, but platinum and ZnO plus Cr2O3 are not the standard Haber catalyst.
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About Haber's Process
Haber's process produces ammonia by reacting nitrogen with hydrogen in a reversible, exothermic equilibrium. The topic covers the iron catalyst, operating temperature and pressure, Le Chatelier's principle, the compromise between reaction rate and equilibrium yield, and the removal and recycling of ammonia and unreacted gases.
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