During catalyst removal from a reactor, which purge gas is used to prevent oxidation?

During catalyst removal from a reactor, which purge gas is used to prevent oxidation?

• A. Argon
• B. Nitrogen
• C. Helium
• D. Oxygen

Answer: (B)

Purge gas is used to create an inert environment and displace oxygen so the catalyst isn’t oxidized during removal. Nitrogen fits this role best because it is inert under typical reactor conditions, does not react with the catalyst, and is inexpensive and widely available. By flushing with nitrogen, oxygen levels drop and oxidation is minimized, protecting the catalyst as it’s handled. Argon and helium are also inert, but they are usually more costly and less practical for routine purges, which is why nitrogen is preferred. Oxygen, on the other hand, would promote oxidation and damage the catalyst.

Purge gas is used to create an inert environment and displace oxygen so the catalyst isn’t oxidized during removal. Nitrogen fits this role best because it is inert under typical reactor conditions, does not react with the catalyst, and is inexpensive and widely available. By flushing with nitrogen, oxygen levels drop and oxidation is minimized, protecting the catalyst as it’s handled.

Argon and helium are also inert, but they are usually more costly and less practical for routine purges, which is why nitrogen is preferred. Oxygen, on the other hand, would promote oxidation and damage the catalyst.