Influence of the catalyst acid/base properties on the catalytic ethanol dehydration under steady state and dynamic conditions. In situ surface and gas-phase analysis

The influence of the acid/base properties of Mg2+-modified alumina on the steady-state and transient behavior of the EtOH to ethene dehydration was investigated by simultaneous gas phase and in-situ surface anal. The steady-state EtOH conversion and the ethene selectivity decreased with increasing catalyst basicity (Mg concn.). The ethene transient behavior is characterized by a stop-effect phenomenon, which is a drastic increase in reaction rate measured for a step-wise decrease in EtOH inlet concn. The relative augmentation of the ethene concn. under dynamic conditions is maximal for the catalyst with Mg/Al at. ratio 2.5. Compared to stationary expts., transients are much more sensitive to modifications of the catalyst acid/base properties. The expts. were described by a model considering the existence of acid and basic sites on the catalyst surface. The Mg concn. influences the kinetic parameters, whereas the site concns. do not show any significant variation. [on SciFinder (R)]


Published in:
Chemical Engineering Science, 54, 15-16, 3593-3598
Year:
1999
Publisher:
Elsevier
ISSN:
0009-2509
Keywords:
Note:
[u'CAN 131:200104', u'35-2', u'Chemistry of Synthetic High Polymers', u'Departmento de Chimie, Swiss Federal Institute of Technology Lausanne (EPFL), Institute de Genie Chimique,Lausanne,Switz.', u'Journal', u'0009-2509', u'written in English.', u'1344-28-1 (Alumina); 7439-95-4 (Magnesium) Role: CAT (Catalyst use), USES (Uses) (effect of Mg/Al2O3 catalyst acid/base properties on kinetics of EtOH dehydration to ethylene under steady state and dynamic conditions); 74-85-1P (Ethylene) Role: IMF (Industrial manufacture), PREP (Preparation) (effect of Mg/Al2O3 catalyst acid/base properties on kinetics of EtOH dehydration to ethylene under steady state and dynamic conditions); 64-17-5 (Ethanol) Role: RCT (Reactant), RACT (Reactant or reagent) (effect of Mg/Al2O3 catalyst acid/base properties on kinetics of EtOH dehydration to ethylene under steady state and dynamic conditions)']
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