Chemical Reaction Engineering
A catalyst loses its activity due to

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

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Chemical Reaction Engineering
The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the

Space time for parallel lines is different
Space time for each parallel line is same
None of these
Larger reactors have more space time compared to smaller ones

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