Question

The gas phase hydrogenation of propanaldehyde was studied over a nickel catalyst at 150°C according to

CH3CH2CHO + H2 = CH3CH3CH(OH)

At low conversions the reaction rate can be expressed as

T = KPp Ph1/2

Partial pressures: Pp = propanaldehyde, Ph = hydrogen, Pa = propyl alcohol

You may assume that (i) hydrogen adsorbs dissociatively and (ii) the overall reaction is irreversible. It is suggested that the rate limiting step is the chemisorption of propionaldehyde. Using Langmuir-Hinshelwood (Hougen-Watson) approaches show that this is consistent with the above kinetic equation.

Answer 1

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