Question

A packed bed reactor is also known as a fluidized bed reactor?
Only when using an alias
Depends on the catalyst used
True
Always false

Answer 1

A fluidised bed reactor is a different state of packed bed reactor but this fluidisation process does not depend upon the type of catalyst particles packed.You can use the same type type of particles either they act as catalyst or an inert material for mass transfer but they doesn't change the definition of a Packed bes reactor to fluidised bed reactor.

So the answer is always false.

Let's understand what are they.So a packed bed reactor is simply a columnn with pipe like structure which is packed woth certain particles they may or may not be a catalyst and remain supported over a perforated plate with tight packing and hence the channel tortuousity will be different at different at different position.Also these particles may or may not be packed within the total column which depends on the application for which this bed will be used.Now when if the bed packed with same particles is fluidised i.e. some fluid like air or water is allowed to pass through these beds of particles at some flow rate these particle will start being suspended in the fluid phase where the mass of particle is balanced by buoyant force acting on them.This is called fluidisation and when some reaction takes place due to this technique it is called fluidisation reaction.So we observe that the packed bed reaxtor is different from fluidised bed in a way that packed particles are in fluidised state and this is only possible when the column is not fully packed up.Hence these two are different not on the basis of type of particles packed .