Chemical Reaction Engineering
In autocatalytic reactions,

No catalyst is used
One of the products acts as a catalyst
One of the reactants acts as a catalyst
Catalysts have very high selectivity

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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 and θ are always equal
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant

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