Which catalysts are used in cracking according to the material?

Which catalysts are used in cracking according to the material?

• A. Alumina (Al2O3) catalyst / Silica (SiO2) catalyst
• B. Copper and Zinc catalysts
• C. Platinum and Palladium catalysts
• D. Iron and Nickel catalysts

Answer: (A)

Catalysts in cracking work by providing acidic surface sites that lower the energy required to break long hydrocarbon molecules into smaller ones. Alumina and silica act as solid acid catalysts, giving you a surface with acidic sites that weaken and cleave C–C bonds in large hydrocarbons, so cracking happens more readily at the temperatures used in refining. This makes the alumina–silica combination a practical choice for catalytic cracking, helping convert heavy fractions into petrol and other lighter products. The other listed catalysts aren’t used for cracking in the same way: copper and zinc aren’t typical cracking catalysts, platinum and palladium are more associated with reforming or hydrogenation processes, and iron and nickel are used in other catalytic reactions rather than the cracking process described.

Catalysts in cracking work by providing acidic surface sites that lower the energy required to break long hydrocarbon molecules into smaller ones. Alumina and silica act as solid acid catalysts, giving you a surface with acidic sites that weaken and cleave C–C bonds in large hydrocarbons, so cracking happens more readily at the temperatures used in refining. This makes the alumina–silica combination a practical choice for catalytic cracking, helping convert heavy fractions into petrol and other lighter products. The other listed catalysts aren’t used for cracking in the same way: copper and zinc aren’t typical cracking catalysts, platinum and palladium are more associated with reforming or hydrogenation processes, and iron and nickel are used in other catalytic reactions rather than the cracking process described.