A novel reactor for determination of kinetics for solid catalyzed gas reactions

Borman, P.C.; Bos, A.N.R.; Westerterp, K.R.

doi:10.1002/aic.690400512

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…Thus, to avoid above-mentioned difficulties and ensure uniformity, the CSTR is typically operated under steady-state regime in the domain of not too high conversion, especially for highly exothermic processes. In some steady-state CSTR devices of special design and at special particle size, the higher conversion can be achieved (see ref ). Then, eq 3 simplified for steady-state and constant flow rate ( V flow ) can be presented as In some cases, the possible nonuniformity can be estimated from the CFD calculations.…”

Section: Cstrmentioning

confidence: 99%

Thin-Zone TAP Reactor versus Differential PFR: Analysis of Concentration Nonuniformity for Gas−Solid Systems

Shekhtman

Yablonsky

2005

Ind. Eng. Chem. Res.

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This paper discusses on different kinetic devices and strategies to ensure concentration uniformity within the catalyst zone. For the differential PFR and thin-zone TAP reactor (TZTR), in which uniformity is achieved by making the active zone thin, the generated nonuniformity was quantified and related to the type of transport. It was shown for the TZTR that diffusion mixes up the nonuniformity created by reaction and allows maintaining small nonuniformity (15−20%) in a wide domain of conversions (up to 80%). Contrary to the TZTR, in the differential PFR, the convectional transport does not mix nonuniformity so that its estimate is equal to the conversion, which limits this reactor to the operation at low conversions (e.g., below 20%). This comparison demonstrates a remarkable role of diffusional transport in achieving concentration uniformity in a kinetic experiment.

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Section: Cstrmentioning

confidence: 99%

Thin-Zone TAP Reactor versus Differential PFR: Analysis of Concentration Nonuniformity for Gas−Solid Systems

Shekhtman

Yablonsky

2005

Ind. Eng. Chem. Res.

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“…In addition a new, improved recycle reactor was used, the Bobo reactor. The Bobo reactor has better mixing characteristics and much lower interparticle resistances than the Berty reactor [39]. A description of both reactors and details of the experiments can be found elsewhere [1,4].…”

Section: Methodsmentioning

confidence: 99%

Influence of reaction products on the selective oxidation of ethene

Schouten

Borman

Westerterp

1996

Chemical Engineering and Processing: Process Intensification

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The kinetics of the selective oxidation of ethene in air over an industrial silver on a-alumina catalyst were studied. Special attention was paid to the influence of the reaction products on the reaction rates of epoxidation and complete combustion. Kinetic data were obtained in two different types of internal recycle reactor and in a cooled tubular reactor, and were fitted separately to several reaction rate expressions based on different kinetic models. A Langmuir-Hinshelwood mechanism, in which adsorbed ethene reacts with adsorbed molecular oxygen, was chosen as the best kinetic model. The reaction products compete for adsorption on the active sites and reduce the rates of both reactions. Carbon dioxide enhances the selectivity towards ethene oxide, whereas water has almost no influence on the selectivity. The fitting of the three individual data sets obtained in the three reactors results in accurate, but different, reaction rate expressions, whereas the fitting of the three data sets simultaneously results in less accurate reaction rate expressions. The systematic deviations found may be explained, to some extent, by differences in the operating regimes in each reactor. The main reason for the deviations is probably the different catalyst activities in the three reactors caused by poisoning. The effect of the addition of products to the feed on the behaviour of the cooled tubular reactor can be described reasonably well by a mathematical model in which the kinetic equations obtained in the laboratory reactors are incorporated. The results of these simulations are sensitive to the kinetics used.

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“…The "rst one is a commercially available &Berty'-type reactor (Berty, 1974). The second reactor, the so called &BoBo'reactor (Borman et al, 1994) has been developed in our research group. A scheme of this reactor is shown in Fig.…”

Section: Kinetic Studymentioning

confidence: 99%