Chemical Reaction Engineering
Which of the following resistances is not involved in a gas phase catalytic (gas- solid) reaction?

Gas film and pore surface diffusion resistances for reactants
Ash resistance
Gas film and pore surface diffusion resistances for products
Surface phenomenon resistance

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Chemical Reaction Engineering
Promoter.

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

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