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Published May 1975 | public
Journal Article

Effects of Nonseparable Kinetics in Alcohol Dehydration over Poisoned Silica-Alumina

Abstract

Methanol and ethanol dehydration over fresh and poisoned silica-alumina have been used as a model system to demonstrate experimentally certain effects of nonseparable kinetics including the change in product distribution upon flow reversal in a reactor with a poisoning gradient. The rate expression r = kK_A^C_A^(1/2)/(1 + K_A^C_A^(1/2) + K_W^C_W) describes the epxerimental data for all reactions although the constants for ether and olefin formation are entirely different and vary between fresh and poisoned catalysts. The nonseparability of kinetics and the concomitant variation of K_A, K_W with poisoning are briefly discussed in terms of interactions between poison molecules and surface acid-base sites.

Additional Information

© 1975 American Institute of Chemical Engineers. Manuscript received September 23, 1974; revision received December 26, 1974, and accepted January 3, 1975.

Additional details

Created:
August 19, 2023
Modified:
October 25, 2023