Steady-state and transient kinetics of displacement adsorption and educt inhibition in dehydration of alcohols on alumina

Morávek, Vladimír

doi:10.1016/0021-9517(92)90195-n

Cited by 13 publications

(4 citation statements)

References 11 publications

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“…The last two modi"cations are consistent with the observations of Moravek (1992). Finally, the following reaction scheme is proposed (A: iPrOH; D: (iPr) O; E: C H ; W: H O): K G are the di!erent equilibrium constants, k G the rate constants, is the fraction of sites S occupied by isopropanol, and U are the fractions of sites S occupied by isopropanol and water respectively.…”

Section: Isopropanol Dehydrationsupporting

confidence: 80%

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Microchannel reactors for fast periodic operation: the catalytic dehydration of isopropanol

Rougé

Spoetzl

Gebauer

et al. 2001

Chemical Engineering Science

137

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A microchannel reactor specially designed for periodic operation and a process to deposit a catalyst, -alumina, inside the reactor channels were developed. The hydrodynamics of the reactor was characterised. Although the #ow in the microchannels is laminar, a uniform radial concentration pro"le and consequently a narrow residence time distribution were obtained. Depending on the manufacturing method the Bodenstein number was found to be Bo"ud/D K 70. The catalytic coating had no in#uence on this distribution indicating a uniform deposition of the catalyst within the microchannels. As the inlet function was only slightly modi"ed in the reactors, frequencies of up to 1 Hz could be imposed for periodic operation. The dehydration of isopropanol to propene was chosen as model reaction to study the dynamic behaviour of a microreactor under periodic concentration variations. The kinetics was "rstly studied in a conventional "xed-bed reactor with the catalyst developed for the microreactor. Experimental results con"rmed the theoretically predicted increase of the reactor performance under periodic operation exceeding the maximum obtainable performance under steady-state conditions.

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Section: Isopropanol Dehydrationsupporting

confidence: 80%

“…Observation by Moravek (1992) let expect a marked in#uence of periodic operation on the reaction rates. Furthermore, the parallel reaction to ether is much slower than the reaction to propene, resulting in a propene selectivity higher than 80% (Fig.…”

Section: Purpose Of Microreactormentioning

confidence: 99%

Microchannel reactors for fast periodic operation: the catalytic dehydration of isopropanol

Rougé

Spoetzl

Gebauer

et al. 2001

Chemical Engineering Science

137

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“…Moulijn et al [20] observed direct C-O cleavage of 1-(4-isobutylphenyl) ethanol on Pd/SiO 2 and Pd black. Dehydration of alcohols to form alkenes on c-alumina also is well documented in the literature [21,22].…”

Section: Introductionmentioning

confidence: 97%

Catalytic Deoxygenation of Methyl-Octanoate and Methyl-Stearate on Pt/Al2O3

et al. 2009

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The deoxygenation of methyl octanoate and methyl stearate over alumina-supported Pt was studied in both the vapor phase in a flow reactor and in the liquid phase in a semibatch reactor. The conversion of both methyl esters resulted in hydrocarbons with one carbon less than the fatty acid of the corresponding ester as the dominant products. In the vapor phase, acid and other oxygenates were observed in low concentrations, but they were not detected when the reaction was conducted in the liquid phase. Under He, condensation products (from esterification and ketonization) were observed. By contrast, under H 2 , mostly paraffins were obtained. These results show promise to directly produce standard diesel components from biodiesel.

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“…Such a situation had already been considered by Ipatieff [83], and therefore the rate equations developed on the basis of this assumption are referred to as Ipatieff-Hinshelwood kinetics [82]. Although this model has been further studied [84,85], the rate equation for the simplest case has the same form as the corresponding Langmuir-Hinshelwood equation, albeit with different meanings for the constants. It is of interest that the equation for a two-step reaction scheme with comparable rates for the steps (no assumption on rate-determining steps) also has the same form, as has been shown by Boudart [86].…”

Section: Kineticsmentioning

confidence: 99%

Elimination and Addition Reactions

Kraus

Knözinger

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Scope and Thermodynamics Common Features Mechanism Influence of Reactant Structure on Rate Direction of Elimination and Addition Reactions Elimination Addition Catalysts Surface Chemistry and Reaction Mechanisms Stop Effect Catalyst Poisoning and Deactivation Kinetics Practical Applications of Elimination and Addition Reactions Dehydrochlorination Vinyl Chloride Production Trichloroethene and Tetrachloroethene Production Production of Linear Alkenes Dehydration Hydrochlorination Hydration and Amination Formation of Ethanol Formation of 2‐Propanol Addition of Alcohols and Organic Acids to Alkenes Isopropyl Acetate Methyl tert ‐Butyl Ether Alkylation and Dealkylation

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Steady-state and transient kinetics of displacement adsorption and educt inhibition in dehydration of alcohols on alumina

Cited by 13 publications

References 11 publications

Microchannel reactors for fast periodic operation: the catalytic dehydration of isopropanol

Microchannel reactors for fast periodic operation: the catalytic dehydration of isopropanol

Catalytic Deoxygenation of Methyl-Octanoate and Methyl-Stearate on Pt/Al2O3

Elimination and Addition Reactions

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