Question

Choose the CORRECT ordering of the diameter \( d \) of the different types of pores in a solid catalyst.

• A. \( d_{{Micro-pore}}<d_{{Macro-pore}}<d_{{Meso-pore}} \)
• B. \( d_{{Macro-pore}}<d_{{Meso-pore}}<d_{{Micro-pore}} \)
• C. \( d_{{Meso-pore}}<d_{{Micro-pore}}<d_{{Macro-pore}} \)
• D. \( d_{{Micro-pore}}<d_{{Meso-pore}}<d_{{Macro-pore}} \)

Hint:

When studying materials like catalysts, knowing the pore size can influence factors like reactivity and selectivity in chemical reactions.

Answer 1

The Correct Option is D

Step 1: Define Pore Sizes.
Micro-pores have the smallest diameter, less than 2 nm.
Meso-pores have a medium range diameter, between 2 nm and 50 nm.
Macro-pores have the largest diameter, greater than 50 nm.
Step 2: Order Based on Size.
The correct order from smallest to largest is:
Micro-pores are the smallest, followed by meso-pores, and then macro-pores are the largest.