Chemical Reaction Engineering
Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in

Intestine
Blood
Saliva
Gland

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Of requirement of very large concentration for such reactions
Of very large activation energy of many bodies
Many body collisions are not favoured energetically
Of low probability of many body collisions

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Chemical Reaction Engineering
Promoter.

Initiates a chemical reaction and is a catalyst by itself
All of these
Atlers the position of equilibrium in a reversible reaction
Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

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Chemical Reaction Engineering
A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m³ and volumetric flow rate 1m³ /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m³ . The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 kmole/m³ , the volume of the mixed flow reactor should be increased by a factor of

7
44015
6
3

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