CORRELATION BETWEEN PREEXPONENTIAL FACTOR AND ACTIVATION ENERGY OF ISOAMYLALCOHOL HYDROGENOLYSIS ON PLATINUM CATALYSTS

https://doi.org/10.22146/ijc.21867

Triyono Triyono(1*)

(1) Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
(*) Corresponding Author

Abstract


Arrhenius equation stated that reaction will proceed faster at higher temperature and with lower activation energy (Ea). Many literatures reported that preexponential factor (A) is constant for certain reaction and there is no relation between A and Ea. Experiment on the reaction of isoamylalcohol hydrogenolysis showed that logarithm of A increased linearly with Ea. The result of this investigation suggests that the rate of a process is affected by the number of active centers on the surface of a catalysts, which influences the value of the pre-exponential term in the expression for the rate constant of a reaction. An increase in the number of active centers corresponds to a higher value of A, the active centers would be less effective and is attended by a growth in the value of Ea. Therefore, reaction with lower activation energy will not always has higher reaction rate due to decreasing of Ea.

Keywords


isoamylalcohol hydrogenolysis; preexponential factor; activation energy

Full Text:

Full Text Pdf


References

[1] Atkins, P. W., 1990, Physical Chemistry, 4th Ed., Oxford University Press, Tokyo.

[2] Bell, A.T, and Lombardo, S.J., 1991, A Review of Theoretical Models of Adsorption, Diffusion, Desorption, and Reaction of Gases on Metal Surfaces, Surface Science Reports 13, Elsevier Science Publisher B.V, North-Holland.

[3] Silbey, J.R, and Alberty, R.A., 2001, Physical Chemistry, 3rd Ed, John Wiley & Sons, Inc. Singapore.

[4] Kreuzer, K and Kramer, R., 1997, J.Catal., 167, 391.

[5] Lin, D.S, Sanders, D.K, and Vannice, M.A., 1994, J.Catal., 147, 370

[6] Steen, E.V, Connor, C.T, and Sewell, G.S., 1997, J. Catal., 167, 513.

[7] Gasser, R.P.H., 1985, An Introduction to Chemisorption and Catalysis by Metals, Clarendon Press, Oxford, 1st Ed.

[8] Stagg, S.M, Romeo, E, Padro, C, and Resasco, D.E., 1998, J. Catal., 178.



DOI: https://doi.org/10.22146/ijc.21867

Article Metrics

Abstract views : 3285 | views : 7231


Copyright (c) 2010 Indonesian Journal of Chemistry

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

 

Indonesian Journal of Chemistry (ISSN 1411-9420 /e-ISSN 2460-1578) - Chemistry Department, Universitas Gadjah Mada, Indonesia.

Web Analytics View The Statistics of Indones. J. Chem.