Industrial Chemistry

This is the industrial method for methanol synthesis:
This catalytic system is efficient under:
- High pressure (50–100 atm)
- Elevated temperature (around 300°C)
Other compounds like ethanol or acetic acid are not formed under these conditions.

Portland cement is primarily composed of:
- Calcium oxide (CaO) — provides strength and structure.
- Silicon dioxide (SiO ) — forms silicates which contribute to the hardness.
Other minor components include Al O , Fe O , and MgO, but they are not major constituents.

Haber's process is used for the industrial production of ammonia ( ) from nitrogen ( ) and hydrogen ( ) under high pressure and moderate temperature. Let's identify the catalyst, promoter, and poison for this process:
- Catalyst: The catalyst in Haber's process is iron (typically in the form of iron oxide, which is reduced to iron during the process). Iron provides a surface for the reaction to occur, increasing the rate of ammonia formation.
- Promoter: Molybdenum is used as a promoter in Haber's process. A promoter enhances the efficiency of the catalyst, often by improving its activity or stability. Molybdenum helps the iron catalyst perform better.
- Poison: Carbon monoxide ( ) acts as a poison in Haber's process. A poison deactivates the catalyst by adsorbing onto its surface, blocking active sites, and thus inhibiting the reaction.
Now, let's evaluate the options:
- Option (1): Platinum, Zinc oxide, Arsenic oxide – Incorrect, as platinum is not the catalyst for Haber's process.
- Option (2): Nickel, Chromium trioxide, Carbon monoxide – Incorrect, as nickel is not the catalyst, though carbon monoxide is a poison.
- Option (3): Platinum, Molybdenum, Hydrogen sulphide – Incorrect, as platinum is not the catalyst, though molybdenum is a promoter.
- Option (4): Iron, Molybdenum, Carbon monoxide – Correct, as iron is the catalyst, molybdenum is the promoter, and carbon monoxide is the poison.
So, the correct answer is Iron, Molybdenum, Carbon monoxide.

Reaction I (Haber-Bosch process): The catalyst used is iron (Fe) with small amounts of promoters like potassium oxide and aluminum oxide.
Reaction II (Water-gas shift reaction): The catalyst used is iron chromate (FeCrO ) or a high-temperature catalyst like iron oxide (Fe O ) promoted by chromium oxide (Cr O ).
Reaction III (Steam reforming of methane): The catalyst used is nickel (Ni) on a support like alumina (Al O ).
Therefore, the catalysts X, Y, and Z are Iron, Iron chromate, and Nickel, respectively.

In the Solvay process: Ammonia recovery occurs by treating ammonium chloride with calcium hydroxide: This reaction regenerates , which is reused in the process.