Chemical Reaction Engineering
In an ideal tubular-flow reactor

There is no mixing in longitudinal direction
There is a uniform velocity across the radius
All of these
Mixing takes place in radial direction

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Chemical Reaction Engineering
A catalyst loses its activity due to

Agglomeration of metal particles caused by thermal sintering of the solid surface
Loss in surface area of the active component
All of these
Covering of the catalytic active sites by a foregin substance

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