Problem

Cyclohexanol was passed over a catalyst to form water and cyclohexene:Cyclohexanol → Water...

Cyclohexanol was passed over a catalyst to form water and cyclohexene:

Cyclohexanol → Water + Cyclohexene

The following data were obtained.

Run

Reaction Rate (mol/dm3.s) × 105

Partial Pressure of Cyclohexanol

Partial Pressure of Cyclohexene

Partial Pressure of Steam (H2O)

1

3.3

1

1

1

2

1.05

5

1

1

3

0.565

10

1

1

4

1.826

2

5

1

5

1.49

2

10

1

6

1.36

3

0

5

7

1.08

3

0

10

8

0.862

1

10

10

9

0

0

5

8

10

1.37

3

3

3

It is suspected that the reaction may involve a dual-site mechanism, but it is not known for certain. It is believed that the adsorption equilibrium constant for cyclohexanol is around 1 and is roughly one or two orders of magnitude greater than the adsorption equilibrium constants for the other compounds. Using these data:

(a) Suggest a rate law and mechanism consistent with the data given here.

(b) Determine the constants needed for the rate law. [Ind. Eng. Che111. Res. , 32, 2626-2632 (1993).]

(c) Why do you think estimates of the rate law parameters were given?

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Solutions For Problems in Chapter 10