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[lnbsak]

One of my friend said the size of catalyst does not have much effect on the reaction rate. I am quoting him.

 

"The external surface area will be impacted a lot, but not the internal surface area - which is the main contributor.

For a given volume of reactor smaller pellets will mean more catalyst in the reactor, which means more surface area, which means better conversion.

Smaller particles will mean higher pressure drop - if your reaction prefers lower pressures, there might be some small benefit from this, but it's usually not worth the recompression energy if you have to recycle the gas.

Smaller particles will mean that the distance the gas has to travel from the bulk to the active sites is reduced, and the product back out (lower internal diffusion limitations).

Normally, you want the smallest pellet size you can practically have. That means balancing the pressure drop, and the crush strength of the particles."

 

 

Now my question is,  is that also the case for catalysts which is coated on the support material example (metallic active material supported on carrier material).

 

Any reference?

Edited by lnbsak, 14 September 2021 - 03:35 PM.