Ma. Aramendia et al., MAGNESIUM OXIDES AS BASIC CATALYSTS FOR ORGANIC PROCESSES STUDY OF THE DEHYDROGENATION-DEHYDRATION OF 2-PROPANOL, Journal of catalysis, 161(2), 1996, pp. 829-838
The reactivity of various magnesium oxides in the gas-phase dehydrogen
ation-dehydration of 2-propanol was studied by using a tubular flow re
actor. The oxides were synthesized from different precursors by using
various methods. The influence of the precursor used, in vacuo calcina
tion and B2O3 doping was analyzed in the light of the results obtained
in the above-mentioned test reaction. Potential correlations between
the surface acid-base properties of the oxides and the kinetic constan
ts of dehydrogenation and dehydration obtained for the test reaction w
ere sought. Also, potential sources of deactivation for the catalysts
were investigated. Carbon deposits observed by temperature-programmed
oxidation and the presence of strongly adsorbed species following an i
sothermal reaction, which were detected by temperature-programmed deso
rption, were found to be the two primary sources. Finally, the reactio
n mechanism was studied; the two proposed pathways are consistent with
the results obtained. (C) 1996 Academic Press, Inc.