Publication

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

Albert Renken, Lioubov Kiwi
1999
Journal Articles

Abstract

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)]

Official source

https://infoscience.epfl.ch/entities/publication/4a58871d-0401-452c-9b41-a1c8892c5417

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Albert Renken, Lioubov Kiwi
1999
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4a58871d-0401-452c-9b41-a1c8892c5417

About this result

Related concepts (32)

Ethanol

Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is an organic compound with the chemical formula . It is an alcohol, with its formula also written as , or EtOH, where Et stands for ethyl. Ethanol is a volatile, flammable, colorless liquid with a characteristic wine-like odor and pungent taste. It is a psychoactive recreational drug, and the active ingredient in alcoholic drinks. Ethanol is naturally produced by the fermentation process of sugars by yeasts or via petrochemical processes such as ethylene hydration.

Heterogeneous catalysis

Heterogeneous catalysis is catalysis where the phase of catalysts differs from that of the reactants or products. The process contrasts with homogeneous catalysis where the reactants, products and catalyst exist in the same phase. Phase distinguishes between not only solid, liquid, and gas components, but also immiscible mixtures (e.g. oil and water), or anywhere an interface is present. Heterogeneous catalysis typically involves solid phase catalysts and gas phase reactants.

Acid

An acid is a molecule or ion capable of either donating a proton (i.e. hydrogen ion, H+), known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid. The first category of acids are the proton donors, or Brønsted–Lowry acids. In the special case of aqueous solutions, proton donors form the hydronium ion H3O+ and are known as Arrhenius acids. Brønsted and Lowry generalized the Arrhenius theory to include non-aqueous solvents.

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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

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