The designers of a new industrial plant wanted to use a catalyst codenamed CR-l in a step involving the fluorination of butadiene. As a first step in the investigation they determined the form of the adsorption isotherm. The volume of butadiene adsorbed per gram of CR-l at 15°C varied with pressure as given below. Is the Langmuir isotherm suitable at this pressure?

Investigate whether the BET isotherm gives a better description of the adsorption of butadiene on CR-1. At 15°C,p*( butadiene) = 200 kPa. Find Vmon and c.

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p/kPa Vicm 66.7 80.0 13.3 26.7 53.3 40.0 33.0 60.8 75.3 47.0 17.9 91.3