Chemical Reaction Engineering
Space time in flow reactor is

Both A and B
Usually equal to the residence time
The reciprocal of the space velocity
A measure of its capacity

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Chemical Reaction Engineering
Promoter.

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

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Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for a non-isothermal reactor
τ = θ , when the fluid density changes in the reactor
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant
τ and θ are always equal

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