Question

During the preparation of NH3 in Haber’s process, the promoter(s) used is/are:

• A. PtO2
• B. Mo
• C. Mix of AI2O3 and K2O
• D. Fe and Mn

Answer 1

The Correct Option is B, C

• Haber's Process: The Haber process is the industrial process for the synthesis of ammonia (NH₃) from nitrogen (N₂) and hydrogen (H₂): $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$
• Catalyst: Iron (Fe) is the main catalyst used in the Haber process. It provides a surface for the reaction to occur.
• Promoters: Promoters are substances that enhance the activity of the catalyst. They don't act as catalysts themselves, but they improve the efficiency of the main catalyst.
  • Molybdenum (Mo): Molybdenum can act as a promoter for the iron catalyst. It helps to increase the surface area of the catalyst and improve its activity.
  • Mix of Al₂O₃ and K₂O: Alumina (Al₂O₃) acts as a structural promoter, preventing the iron catalyst particles from sintering (clumping together), which would reduce the surface area. Potassium oxide (K₂O) is an electronic promoter that enhances the ability of the iron to adsorb nitrogen.
• Other Options:
  • PtO₂: Platinum oxide is a catalyst, but not typically used or specified in Haber's Process. It's a less common option.
  • Fe and Mn: While iron is the catalyst, manganese is not a typical promoter for the Haber process.

Correct Answer: Mo, Mix of Al₂O₃ and K₂O